Bmw Ac Hissing

Save on Brake Boosters with great deals at Advance Auto Parts. Some you can avoid, but others will be beyond. Hi all, After picking up a 2004 Vauxhall Corsa yesterday, I've discovered a hissing noise coming from the top corner where the brake fluid reservoir is. E46 330ci restricted performance (re-posted) Reply BMW have quoted me £340 to change the MAF but as you can appreciate without knowing that it is definitely the problem I’m not keen to do. A/C systems can make hissing noises during normal operation. 5 to 2011, read on with great interest or concern. Mini Cooper: Why Doesn't My Air Conditioning Work? Driving without air conditioning in the summer is simply inconvenient and uncomfortable. Any time you hear a cyclical sound from the front of your engine, where the belts are, you should check it out. A slow, slow leak: often self-sealing. Includes model range, engines, transmissions, safety equipment, crash testing, features and updates. When I turn on the AC/heat/defrost on any setting the car makes a squeaking/hissing noise like something being sucked up by the vaccum cleaner but it cant go thru the tube… its loud on the middle fan speeds and doesnt go away when the car warms up… need help. Too much air pollution and smoke coming out of your BMW’s muffler is a good indicator of muffler replacement. It sounds like air escaping from somewhere however I can't seem to find where it's coming from. Its still under warranty. Exhaust Gas Recirculation Valve (EGR) problems, Alfa Romeo Exhaust Gas Recirculation Valve (EGR) problems fixed, Audi - 1. When I turn it off, no sound at all. We'll go over these problems in more detail and discuss what you can do to fix them. After doing some diagnostics, I detected audibly a hissing sound coming from the low input port, leading me to believe the schrader valve is leaking. So I am going to fix that before I get further into the ac problem. The engine itself can also be the cause of noises when accelerating. However, cheaper units with similar features are. AGCO provides overall lowest costs of vehicle ownership. Twice they replaced the dash controls. Daignostics is usually the hardest part of auto repair, and especially something like refrigeration (AC). It's not cooling, either. A BMW repair shop may put a UV dye in the refrigerant to see if the A/C system has any visible leaks. Overheating hissing noise coming from the front of the car coolant leaking I immediately pulled over and shut off the car and the temperature started to drop when I turned the key to accessory mode and the fans started running again. I suspect that during that trip, your compressor stopped pumping as the cabin temp was already achieved so the system slowly equalised itself across the expansion valve and thus when the compressor came on again, the hissing sound occured. At Byrd Heating and Air Conditioning, our technicians understand the various components within a heating and cooling system, so we know the proper way to take it apart and get to the coils and compressor. Idling car engines may surge for several reasons. Welcome To V6Mustang. When I turn on the AC/heat/defrost on any setting the car makes a squeaking/hissing noise like something being sucked up by the vaccum cleaner but it cant go thru the tube… its loud on the middle fan speeds and doesnt go away when the car warms up… need help. Say what you will about the cheese-block lines and frumpy two-tone paint schemes of the outgoing Mercedes-Benz SL, it was no slave to fads. 6 weeks ago I took my car in for a first service. My 2005 m3 coupe has this air hissing noise inside car seems like it's coming from passenger side behind dashboard. If your air conditioner is freezing up due to undersized ducts, you should call an HVAC contractor and have them take a look at your problem and offer their suggestions. Please do your research. Fuel tank leak 3. No problem I thought â€" these things happen… After chasing the dealership each week over the last 6. It makes this LOUDDD whistling high pitch sound when i'm at a red light, or in park. The sooner you respond to under or overcharged refrigerant the better. These AC signals are rectified and filtered by diode D1 and capacitor C8, and the resulting positive DC voltage provides a forward bias to transistor T2. You might hear many noises coming from your central air conditioning unit. Obviously something isn't right with it, and I know I need to get it looked at. Uncovering The Causes Of Suspension Noise On BMW Vehicles. Replacing the engine’s breather system is an alternative lower cost repair to an engine replacement. Seems they even knew that by telling you to bring it back if it don't work. Edwards Deming. You need to find the leak first. You have a leak, but where? BMWs have multiple components in their cooling systems and any of them could cause a leak, however the most common of coolant leaks are caused by a failed Coolant Temp Sensor located (in most cases) in the lower radiator hose. The air conditioning coolant leaks. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article meets our high standards. We are one of the very few genuine Nissan AC Parts online sellers and we are venerated for selling the genuine Nissan AC Parts. Twice they replaced the dash controls. Read on to learn how to diagnose the underlying issue. From bad ductwork to a faulty compressor, you'll want to address any problems quickly. After issuing a recall for every Cruze that has been produced, it turns out that there are two problems plaguing the Chevrolet-built car, not just the one we originally reported. Andy's Auto Sport is the ultimate shopping destination for your BMW 3 Series blow off valve needs!. But, people generally face this issue. The hissing is very uneven, stops sometimes on idling and resumes when I give it race. The Town Crier publishes six different glossy magazines throughout the year. Contact your gas company and have them investigate the gas smell from your air conditioner. In Tamil Nadu, a young man was driving his BMW on the Highway,on spotting a snake on the road, he tried to run over it. The only way I get it to turn off is when I turn the fan off or press the A/C. pdf) or read online for free. Air conditioning system. AC NOT WORKING PROPERLY AC is not blowing COLD air. No matter how much your air conditioner operates, it’s important to perform routine AC maintenance that keeps your evaporator and condenser coils and the rest of your system running efficiently. VERDICT ★★★☆☆ Good sound quality, crisp video resolution and a very user-friendly interface make this camera worth adding to your shortlist. Hissing AC signals are coupled to relay switching circ- uit via audio transformer. Repair : A repair shop will tell you the entire compressor needs to be replaced, which also necessitates a full evacuation & recharge of the entire AC system and replacement of the drier/filter. Hissing sound from brakes What causes a hissing sound from under the dash. Other then the noise it seems to be working fine because it is supplying power. When I first start my car the AC will only blow warm air. No hissing that I could hear of, just the whistle as the revs rise and fall with the AC on only. a freind brought his e46 BMW 318i with climate control to me as AC had stopped working and he had been to INH who advised to change compressor and condensor but woudnt say whether this would actually solve the issue and…. You’ll enjoy performance that’s significantly better than your original speakers—and it’s our most affordable computer speaker system. The hissing is very uneven, stops sometimes on idling and resumes when I give it race. Diagnosing an AC refrigerant leak. Contact your gas company and have them investigate the gas smell from your air conditioner. A couple months ago, I started developing a similarly described sound. Manifold Gauge Readings. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. 3L V6 Engines. When I start the car I dont hear anything, then when I put into drive I can hear the hissing like a. Then, I attempted to turn on the air conditioner on in the car last week and again - very bad squelching noise Read moreCompressor Rapidly Cycling On and Off in Car Air Conditioner. Learn more about Buick Enclave at the Edmunds. Why Do I Hear a High-Pitched Whistling Noise from My Air Vents? 2015 Nov 12. But even if your AC fails completely, you don't have to panic: AC Designs Inc. Last Thursday night (7/14/05) I was sitting in my car in a parking lot with A/C running. This is #1 on the list. Yeah I'll have to go through all those, But it only hisses if I jump the Compressor Clutch to force compressor to run. I took the car back a couple of weeks later. By evening the ac died. It got to be we could never know if some hissing was normal or not - because for two years there was always at least a little. Last summer, my AC went warm. Uncovering The Causes Of Suspension Noise On BMW Vehicles. This kind of interference, known as audio rectification, is usually caused by the receiver. Without it, the vehicle won’t run; it’s as simple as that. Labels: behr bmw parts, bmw auto parts, bmw replacement parts, bmw salvage parts, bmw suspension parts, Fix-A-Dent Auto Body bmw spare parts, parts foe bmw, parts for bmw cars, varis bmw parts As is known, any car starts to rust in due course is the fact. Any idea if my A/C is going out or could it be something show more I drive a 2011 Hyundai. Daignostics is usually the hardest part of auto repair, and especially something like refrigeration (AC). Whenever there is a repair that needs to be completed for my car it is usually very expensive. Recently changed the oil. Obviously something isn't right with it, and I know I need to get it looked at. Do you hear your air conditioner making a humming noise? An AC hum is usually not a concern, unless the sound varies greatly from its typical sounds. When I first start my car the AC will only blow warm air. After taking delivery of the car, I couldnt help but notice a hissing sound coming when the AC runs, I was afraid it was a gas leak. 07 uplander no a/c hiss from vent. 3L V6 Engines. So, if it is over 90 degrees outside and you turn on the AC, the compressor may run on its own to bring up the necessary pressure to cool the cabin. If there is too. BMW Exhaust Muffler Parts Online. Hissing present, air is warm. I just wondered if the noise is normal or indicated the problem with the expasion valve or R12 leak. DIY Auto Service; AC System Service and Component. The lines begin to leak where the aluminum part of the lines run into the rubber line. Injector leak 2. This leads them to be quite intermittent in the case of mild leaks, its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue. BMW rang me yesterday to say there is no leak in the gas but since I have complained about the air conditioner again and insist there is something wrong they have delved further into the air conditioner and there is a problem with the compressor. If you find too many. com Bottom of Page. Excessive hissing, popping, or booming sounds coming from the exhaust system usually mean hole-filled mufflers. If your air conditioner is emitting a foul smell while running, it’s important that you get it identified and removed right away. It was late at night and pouring rain in Houston. Hissing sound came in the morning but mild cooling was there. nothing different, same synthetic oil I have always used (and suggested by the dealer). Its still under warranty. An A/C blower pulling in air from the home. We offer you the most comprehensive line of high performance air conditioning components available. If your filter is dirty and clogged, it can cause many issues with your unit. Speed was approximately 30-35 mph. Andy's Auto Sport is the ultimate shopping destination for your BMW 3 Series blow off valve needs!. Butim not too sure. So your low coolant (antifreeze) light came on and your coolant level is low. If there is a decrease in your vehicles fuel mileage and overall engine performance you must seek out urgent service for your BMW. The engine vacuum can overcome a small leak, thus making a hissing noise. If you can pop the hood of your car, you can use a car leak repair product from Bar’s Leaks. Uncovering The Causes Of BMW Suspension Noise. A hissing sound is not always present either. Long story short, air conditioner compressor noises are usually bad news. Some you can avoid, but others will be beyond. When it is not, which of course occurs on the most brutally hot day of the year, the A/C suddenly becomes a cruel joke, blowing warm, stale air into your vehicle. What is the usual service requirements of BMW air con? is ~5 years about the average time for a service/re-gas? Or is it something more sinister? Thanks. It has remained cheap to buy, run, tax and insure, making it the. I've got it parked out in front of my garage. ISPConfig 3 is an open source panel for Linux which is capable of managing multiple servers from one control panel. I have never been in the dash of a silhouette. If the valve is working properly, you should hear a hissing noise from the valve with the engine running at idle. Do you have a brake pedal that feels hard to press? You may have a bad booster, booster hose, or check valve. Hissing coming through ac vents. After taking delivery of the car, I couldnt help but notice a hissing sound coming when the AC runs, I was afraid it was a gas leak. The downside of a switching design is that it is considerably more complex. If the hissing was the refrigerant leaking out, it would have blown hot air immediately. Vacuum Booster Operation. Benz C320 AC / Air Conditioner Trouble - Warm at Idle I was recently low on freon and had the hissing sound so charged it to the high amount to about 45lbs on. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Hissing only happens when fan is on. The compressor may be loose. The booster will never cause a low or soft. We asked Otto to write us a detailed "how to" on diagnosing and repairing the most common causes if overheating. This is a perfectly normal condition when the engine is turned off as the pressures equalize within the a/c system. It then blows warm air. From bad ductwork to a faulty compressor, you'll want to address any problems quickly. Solution: Schedule a professional AC repair if you think your system may be low on refrigerant. In this article, I present some of the possible causes of whining noise while accelerating. This system should be using vacuum from the engine to open and close the air diverter (blend) door inside the dash. Your air conditioner's blower constantly circulates air in your home. So what does a hissing sound mean? It can mean a few things, but no matter what the exact problem, it’s important to have your Dynamic Mechanical Heating & Air Conditioning expert manage your air conditioning repair services in the Bristol and in New Haven whenever you hear a hissing sound coming from your AC. Just given the car at the dealer. creates an AC voltage from the input DC voltage. A valve core tool is four tools in one. Find top-rated auto repair shops and experienced mechanics near Cairo, GA. My buddy was driving my 2006 Chevy equinox awd the other day when the car got hot and cut off they put water in it Jumpstart ed the car and drove it home it would not drive over 25mphalso there's a rattling noise coming from either the top or bottom in front of motor the car will run and stay running with no problems except the rattling noise sound like a chain being pulled down set of metal. When your car's AC is low on refrigerant, it'll blow hot air. You may find that the noise is present when you turn the engine on, but stops when you put pressure on the clutch. You hear rumbling noises coming from under or toward the rear of the vehicle: The trouble could be a defective exhaust pipe, muffler, or catalytic converter; or it could be coming from a worn universal joint or some other part of the drive train. For questions about the TrueCar Auto Buying Service please call 1-888-878-3227. (Solution: bypass CANbus and draw power from battery) e. Data helps make Google services more useful for you. Inspect all vacuum lines and hoses for leaks, and make sure they are properly connected. You will need to have refrigerant and dye added to the system and the hissing will go away. When the car AC system is running there is a high side and a low side that’s divided by either an expansion valve or an orifice tube. So, if it is over 90 degrees outside and you turn on the AC, the compressor may run on its own to bring up the necessary pressure to cool the cabin. Uncovering The Causes Of BMW Suspension Noise. From time to time, you may notice your air conditioner leaking water outside. Actually the TEV performs only one very simple function - it. If you shut down engine and re- start the car AC goes through same cycle, it takes about 10- 15 mins for cold air to blow properly at proper speed. Does any one have any ideas on what is causing this? Thanks. i called bmw north america and spoke to them about my issue and it did not show my car having any recalls. I drive a 2011 Hyundai Sonata. Your air conditioner blowing hot air out the vents could be caused by a variety of problems, ranging from simple and cheap to more complex and expensive. We've put together a quick guide explaining how the Volvo PCV breather system works, symptoms of a clogged breather system, and how to inspect it. You may also see puddles of liquid under your car in the morning which means something is leaking. I have the same issue, it's the bearings on the circulation fan starting to go. This leads them to be quite intermittent in the case of mild leaks, its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue. Is it related to the noise? It is a 2001 Toyota Camry that I bought new. Here's our foolproof tips for finding yours. re-gassing will only mask the problem and not fix it. It has remained cheap to buy, run, tax and insure, making it the. Weird noise when AC switched on General E46 Forum. Any second or updated opinions? Search for AC blower fan replacement. I have a 98 jeep cheerokee sport. If you still can't find, please use search form below. 90% of the problem of it not blowing cold after re-charge is that they over charged it. to multiple accessories like the air conditioning, power steering and alternator. Hissing Noise-One of the more common weird sounds that drivers may here coming from the air conditioner is not a bad sign at all actually. Exact same problem cropped up last night in my X3. Leaking Ducts. The car has an issue with the AC not working correctly. There is an ond and off hissing sound from the center of the - Buick 2009 Enclave question I have a 2001 BMW. There's a new high-pitched hissing noise coming from my engine, sounds kind of like a school bus accelerating or a turbo spooling up. Worldwide it employs over 116,000 and in 2014 revenues were reported at Euro80 billion. The AC Delco condenser lasted just long enough to get me through the warranty period. Engine is very rough on idle, very shaky. Yeah I'll have to go through all those, But it only hisses if I jump the Compressor Clutch to force compressor to run. A good car radiator is vital to the operation of your car. HVAC Noise Descriptions & Recordings - Group 3 HVAC System Noise Diagnosis, Hiss, Howl, Huff & Humming sounds. AutoZone stocks the best tire valve stems for cars and trucks from brands such as Slime and Xtraseal. When I start the car I dont hear anything, then when I put into drive I can hear the hissing like a. Commercial AC Repair Tucson. The most recently reported issues are listed below. Volvos are known for the sticky key problem. Today, about a couple hours ago, the brake pedal started to get very hard to push and wasn't stopping the car very well. Power supply: a T61p is known to have the sound if a 90W power supply revision 01 is used. Are you experiencing whining noise when accelerating your car to high RPM speeds? This seems to be a common problem with many cars. now the one main noise, is hissing from my dash, sounds like its coming from the a/c selecter which has always leaked for the past month, it only does it when running, when you shut the truck off itll keep doing it for about 10 seconds while slowly. I have a 2002 Honda Accord coupe with 130K miles on it. As a result, many valves are needlessly replaced when the cause of the system malfunction is not immediately recognized. The sooner you respond to under or overcharged refrigerant the better. Identifying Weird Car Noises. This car is just a pretty piece of junk. Certified Dealers are contractually obligated by TrueCar to meet certain customer service requirements and complete the TrueCar Dealer Certification Program. Last Thursday night (7/14/05) I was sitting in my car in a parking lot with A/C running. The dazzling example featured here, chassis GT40P/1074, earns bonus points for at least three reasons. I took it to a repair shop, he "recharged" it, worked "ok" for about month with minimal hissing, and then went warm again and hissing was continuous. If that's OK, then you're onto the air flow meter. 5 to 2011, read on with great interest or concern. Mercedez-Benz & AMG discussion forum, news, and rumors for owners and enthusiasts of Mercedes vehicles. Although they are in a state of panic, I know right away it's not a boa constrictor, rattle snake, or any other animal making that noise. Active 6 years, 11 months ago. Includes model range, engines, transmissions, safety equipment, crash testing, features and updates. 5 Things That Might Signal an Imminent BMW Water Pump Failure Desert Oasis Auto Repair January 19, 2017 BMW Every part of your BMW is important, and when a single part is malfunctioning, the health of your entire automobile could be in danger. Its still under warranty. The Nissan Altima is a mid-size car. How to find a car's low side pressure port is one of our most frequently asked questions. Why is my steam radiator hissing? By %26quot;I have changed the steam valve%26quot; do you mean the valve that lets steam in, or the air vent (if it has one)? A steam valve (the one that lets the steam in) should be all the way open or all the way closed - don't use it as a throttle unless it's incremented (has 0 - 10 written on it). Chassis Plates,Frames & Kits-Racing Upgraded 2 Speed two speed system Kit Fits 5IVE-T 5t Rovan LT LOSI FID pnopir755-novelty items - www. A good car radiator is vital to the operation of your car. From car brake pads and shoes, to calipers, rotors, master cylinders and brake hardware, we've got the parts for most every brake job. (Solution: bypass CANbus and draw power from battery) e. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos. Got a central air conditioner that turns on and off every few seconds or minutes? This is called “short cycling” (because normally the AC has a regular on and off “cycle” that varies with the outside temperature. I just wondered if the noise is normal or indicated the problem with the expasion valve or R12 leak. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. now the one main noise, is hissing from my dash, sounds like its coming from the a/c selecter which has always leaked for the past month, it only does it when running, when you shut the truck off itll keep doing it for about 10 seconds while slowly. Took it back in, found out the ac evaporator went bad. It is easily affordable and our Discount AC parts offers its customers, the genuine Nissan AC Parts at unbelievable prices. The car won't start, not even click, but everything else works fine in the car. Together, they cited information from 13 references. Are you experiencing whining noise when accelerating your car to high RPM speeds? This seems to be a common problem with many cars. Sign in to review and manage your activity, including things you’ve searched for, websites you’ve visited, and videos you’ve watched. The roles of the receiver/dryer: Separates gas from liquid. I have had it serviced twice, the first time the coils were cleaned and freon added. Try putting some (I believe it's lithium grease) on your key and work the key. I took the car back a couple of weeks later. I have 2002 e46 325xi Randomly a hissing noise or a sound like air pressure is being released happens every so often when I'm driving It sounds like its coming from the steering wheel or behind the dash board Its not a long sound its usually sort and lasts half a second It doeant affect the steering and ot doesn't happen when I turn, well sometimes it does but usually when I'm driving straight. I have a 2003 C320 and have had this problem for some time and looking for some assistance. The car won't start, not even click, but everything else works fine in the car. If you notice your engine is suddenly louder than normal it could be caused by a number of issues, not all of them bad. The noise starts at about 2000 RPM and just gets louder from there. The forked end removes and installs valve cores. Whenever there is a repair that needs to be completed for my car it is usually very expensive. The relay has a bad habit of getting stuck in the “on” position. Rattling sounds indicate loose or busted baffles inside. No more dash hissing and the AC is still nice and cold. Mini Cooper S R56 – engine woes – BR Racing Blog – SERVICE Alert. If a leak is present, you will hear a hissing sound, though it may be difficult to hear with the engine running. Daignostics is usually the hardest part of auto repair, and especially something like refrigeration (AC). The engine vacuum can overcome a small leak, thus making a hissing noise. We go out of our way to carry every major line of BMW 1 Series blow off valves, so that whether you are looking for a Greddy blow off valve or a HKS blow off valve or anything in between, we've got it for you. Seems they even knew that by telling you to bring it back if it don't work. Recently changed the oil. Jeremy Laukkonen is a Seattle-based tech writer and the creator of a popular blog and video game startup. I have the same issue, it's the bearings on the circulation fan starting to go. My car has an automatic transmission. Really worried what will happen once the warra ty expires. 9/10 it will be from the condensor. If you shut down engine and re- start the car AC goes through same cycle, it takes about 10- 15 mins for cold air to blow properly at proper speed. How do I determine which valve core remover tool fits my vehicle? I have found one from Mastercool and one from Interdynamics. I turned on the other A/C unit and it does not have the same sound. Have a better understanding of air compressor check valves with this informative article. I hear a hissing sound, seemingly from behind the dash, and only when the car is set to vent. The evaporator coil (the part of your air conditioning system that’s inside your home) The indoor fan unit (air handler or furnace) Even if your air handler or furnace is working fine now, replacing it at the same time you replace your air conditioning system can make sense. Bimmerforums is the preferred online BMW Forum and community for BMW owners. VERDICT ★★★☆☆ Good sound quality, crisp video resolution and a very user-friendly interface make this camera worth adding to your shortlist. Fix a leaky tire valve in five minutes using an inexpensive valve core tool and replacement cores. This can range from a mild hissing noise to a loud hissing or a noise some describe as a "scream. Too much air pollution and smoke coming out of your BMW's muffler is a good indicator of muffler replacement. Chassis Plates,Frames & Kits-Racing Upgraded 2 Speed two speed system Kit Fits 5IVE-T 5t Rovan LT LOSI FID pnopir755-novelty items - www. I have an 02 LS V6. I have a 98 jeep cheerokee sport. The pedal side of the diaphragm has two valves attached to the pedal arm. Welcome to the AcuraZine - Acura Enthusiast Community. If the AC blows cold then warm condition was caused by moisture in the system, you won’t notice a decrease in airflow and you won’t see a puddle of water after shutting off the vehicle. The Inventors Of Performance Air Conditioning… Vintage Air is owned and operated by experienced street rodders who have been involved in the sport for over thirty years. Starter Motor Repair: This instuctable will show you how to repair a starter motor off a Toyota Corolla FXGT. Had Freon added to system worked ok for 2 to 3 days and then nothing. I found a local E30 guy on Craigslist selling a/c stuff he'd yanked from his car to turn it into a track rat, including a compressor of unknown provenance. Already wasted $1000 having the exhaust manifold gaskets replaced (dealer said that was the cause) but the smell is still there. When someone asks us, "why is my air conditioner so loud?"I often respond with, "why is your truck so loud?" Just as with your truck, a noisy air conditioner is a complex piece of machinery with many moving parts, all of which interact with each other. You might hear many noises coming from your central air conditioning unit. I hear a hissing sound, seemingly from behind the dash, and only when the car is set to vent. I would first look to see if there is a broken vacuum line going to the dash from under the hood. The car's mileage is 42K. I have never been in the dash of a silhouette. In normal cells, a system called DNA mismatch repair (MMR) corrects errors that occur during DNA replication. The hissing begins when I turn the car off. Most likely cause: Your compressor. I made a video showing how to run an AC performance test. Over the past week I have noticed when turning on the A/C or defroster it would make a slight hissing sound for the first few seconds. This is strange. Actually the TEV performs only one very simple function - it. Includes model range, engines, transmissions, safety equipment, crash testing, features and updates. The car won't start, not even click, but everything else works fine in the car. To check operation of the valve, pull off the hose from the valve (this will require a bit of patience and grunting. Your air-conditioning system may be low on refrigerant. It's a clogged line to your air conditioner which has been clogged with. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. My air conditioner on my 2003 BMW 325i keeps on going on the fritz. One of the most disconcerting noises you'll hear coming from an air conditioner is a high-pitched squealing sound. We designed our auto air conditioning solutions to last a lifetime! We make them right here in USA with a lifetime warranty! Call 810-606-8088 or 877-606-8088. Bimmerforums is the preferred online BMW Forum and community for BMW owners. Daignostics is usually the hardest part of auto repair, and especially something like refrigeration (AC). Most likely cause: Your compressor. Like exhaust noises, these noises are more noticeable when accelerating because the car is working harder to get you up to speed. The hissing is part of the operation of the air conditioner. If the hissing was the refrigerant leaking out, it would have blown hot air immediately. If it's hot in a situation of car air conditioner blowing hot air , then it's an engine problem. Hissing only happens when fan is on. If I take my foot off the accelerator to let the car coast, I. You can view the latest magazine as a PDF here or explore our archive of past issues. One noise can be very distracting, even irritating. also my electric fan (puller fan) is not turning on when the air conditioning is turned on. Whenever there is a repair that needs to be completed for my car it is usually very expensive. At Byrd Heating and Air Conditioning, our technicians understand the various components within a heating and cooling system, so we know the proper way to take it apart and get to the coils and compressor. These AC signals are rectified and filtered by diode D1 and capacitor C8, and the resulting positive DC voltage provides a forward bias to transistor T2. I have a 98 jeep cheerokee sport. Today, about a couple hours ago, the brake pedal started to get very hard to push and wasn't stopping the car very well.