Passat (B5) :: Air Conditioning - Vents Hiss When AC Is On
Sep 8, 2011
Air Conditioning issues, vents 'hiss' when the A/C is on ... So we just bought an 04 B5.5V TDI and when we were test driving the car, I didn't actually notice this issue since we didn't do extensive driving and I wasn't listening for this problem specifically.
So basically what I found after the purchase is that the a/c is not very strong at all... even full bore and the vents have a hiss, hissing, whine, moan coming from them.
The minimal troubleshooting I have done was just to try to determine, while at idle from inside the car... when the noise was happening. What I have come up with is this.
If the AC switch is off, I can turn the fan on to any speed and the noise will not present itself.
If the AC switch is on, going from fan stopped to speed 1, about 70% of the time the hissing will not present.
If the AC switch is on, going to any of the faster fan speeds (2+) and center vents begin to hiss at me.
Once the hissing is happening, turning the fan speed back 1 will not stop the hissing.
The hissing slows and stops when the fan is turned off or the AC switch is turned off.
The hissing does not sound like a fan rubbing. Its not quite a mechanical sound like a bad bearing or debris hitting the fan.
The hissing sounds a little bit like someone blowing through a straw. However, the fan seems to move up and down the speed range just as expected and the air output seems to match the speed... so its not like the air movement is low.
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I turn my car on. I have no error lights on my dash. The heater and AC control unit lights up. I press the down arrow on my in-dash heater/AC control unit so I can get some cold air. I hear a hissing sound for about 2 seconds, but no air comes through the vents.
I get the same effect when trying to use the heater. Quick hissing sound, no air through vents.
Both stopped pushing air at the same time (when my ac stopped working, I tried to put out heat just to check)
I have checked al the fuses under my steering wheel and in the engine compartment using a circuit tester (w/light).
There is an AC Clutch relay fuse in the engine fuse box. Not sure if I should check that.
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I have a 2003 GMC Envoy XL. There isn't any heat or air conditioning coming out of the overhead vents. My mechanic tells me it is a control head module. I would like to try and fix this myself. I don't know where this module is located on the vehicle. It seems I could just remove the defective one and replace it with a new part. Are these modules easy to find in part stores and how expensive is this part?
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My uncles 99 f150 is acting a little strange. When he steps on the gas, the air conditioning comes out of the defroster vents. What's going on?
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I enjoy your show and newspaper column. Here's my situation. I have a 2008 Grand Prix with a stinky problem. There's a terrible musty, moldy smell that comes out of my vents (any vents, i.e. dashboard, floor, defrost) after I shut off my air conditioning. When just the fresh air from outside is coming through the vents, everything is just fine. When I turn on my air conditioning, everything is just fine. When I turn off my air conditioning is when the funky smell starts.
Mechanic number one cleaned out the drain hole, sprayed anti-mold spray and foam through the air intake vents with the recirculation switch on and the windows rolled up. But the mold is still there. Mechanic number two shared with me that the only way to get the mold out is to disassemble part of the A/C unit, physically clean out and disinfect the unit and then add some other part that drain or dry the unit so moisture never sits in there and starts the molding process. Is that the best way to deal with this problem?
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So I got in my truck yesterday and i started it like normal and turned air on. The air will not blow out of the vents but only the defrost vents. I have checked all vacuum lines and good, my 4x4 engages and no issue with it locking in. I am Puzzled on what it could be?
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My 1999 F 250 5.4 liter. I know I have a vacuum leak because whenever I accelerate the air conditioning coming from the vents switches to the defroster. So my question is how do I go about finding the leak? My hubs in the front are manual so I know I don't have lines going up there. I do have some mechanical capabilities I've changed water pumps alternators brakes etc. But never anything with vacuum lines or a/c.
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I seem to be having an issue with my air conditioning. I don't think it's an ID-10T error, but it is very peculiar.
My driver side vents blow hot or lukewarm air, however my passenger vents are ice cold. I have the 15 limited, so it does have the "dual" control, and as such I think the issue may be related to that.
Both controls are set to low, max fan, head only, and AC. The "Sync" and "Auto" buttons have no effect.
Any things I can check? I really do not want to bring it into the dealer as they treated me very poorly the last time I came in and my car was out for a month.
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Would having the cup holder replaced on an 08 Wagon with the non climatronic ac system require the disconnection of the right hand side selector that controls where the air comes out.
Just noticed today that no matter what position it's in the air only comes out on the windscreen vents and the two side vents on either end of the dash.
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Is there something I need to do to get the ac to come out of the vents in the back of the arm rest for passengers in the rear like my 1 year old? I looked in the manual briefly and didn't see anything. Am I screwed without climatronic?
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Just picked up the 2.0T, komfort package. Loving it everyday. But noticed the air conditioning not getting really cold until after about 10-15 minutes of driving? It just blows warm air out and then suddenly the artic blast kicks in.
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The air conditioning of my 2000 Passat wagon cuts out when the car is not in motion. It works great when the car is in motion but not at all when stuck in traffic or at a stop light.
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tried the ac for the first time and condenser turned on for only 3-4 seconds and shut off . then turned on after 3-4 seconds and turned off again. no cold air . I bypassed the low pressure switch with a wire in the connector that plugs in to the switch and the condenser ran continuously. my question is .....does the accumulator hiss after the engine is shut off with the ac on? I did remove the pressure switch and heard a little 'psssst'. there was a coating of oil on the o-ring . I screwed the switch back on . Seems like there was pressure in the accumulator. just wondering if the hissing after shutoff was normal. No signs of leakage anywhere. Maybe need a recharge after pressure test?
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I just got a new 2014 camry LE. Overall it is what it is and I am very happy with it. However one thing that is got me annoyed is that there is a hiss coming from ALL speakers. Even if the radio is off the hiss is there. Basically after some experimentation, any time the head unit is completely booted up the hiss is coming from the speakers.
To make sure it is not just my car, I checked out a few more LE from the dealer and they all hiss from the speakers when the head unit is on.
Havn't had a chance to get off work to go to the dealer yet but a buddy at work tells me his older Bimmer had a similar issue. For him, it turned out to be the amp was set to max so that max volume would be achieved. For him he was able to adjust it.
Do the Camry's have a similar adjustability? I'm willing to sacrifice sound level for no hiss.
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Daughter's 09 Accent 86k miles making a very quick hiss when accelerating rapidly and/or uphill about a half second before first shift. Hiss stops noticeably before the shift happens. She reports a slight 'kickback' in the pedal, but I noticed no power loss when the passenger seat. No check engine light. Car has an aftermarket cruise. Sound seems to be coming from the right-ish side of the vehicle and outside the cabin. Doesn't occur under 'grandpa' driving conditions. Pretty much only when using the accelerator as a binary switch.
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At some point in time I noticed that when I turn on the rear defroster a hiss develops in my (factory-installed) radio, operating on the FM band. Most of the time this hiss is strong enough to mask the audio entirely. I noticed, too, that one or possibly two "printed wires" in the rear window may no longer be operating; however, I don't know whether this is connected to the hiss problem.
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I have 2000 miles on a 2014 Prius v. When I try to use either Apple shuffle or iPod I get a hiss noise on top of what ever track is playing. I have tried various cables to make the connection between the audio system and the apple products.
My dealer gave me a free hour but could not re create the noise and sent me away with a comment blaming my devices. The problem recurs but now the dealer says I must pay $100/ per hour for diagnosis. No reason to trust the dealer diagnosis technique. Toyota says I m free to try another dealer and says I must use genuine Apple cables as "specified by my dealer".
Apple does not make a coaxial connector cable for the purpose and relies on Belkin. My local authorized apple dealer does not sell the Belkin cable and favors a different cable instead. I am certain the cable is not the issue.
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I have a 2004 f150 lariat crew cab 4x4 with the 5.4 3 valve. It now has 113 000 miles. Since i got it at 85 000 miles its had a hiss when the engine was under load. So like light acceleration or driving into wind. The guy i bought it from said that it had a manifold leak so that's what i figured it was. I got the manifold fixed and it still hisses. There are no check engine lights. It almost feels like my engine lags when it starts hissing. It sounds like its coming from right on the other side of the fire wall. What it could be?
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how to take off the air vents?, mine are all messed up and dont work right when i try to adjust their direction, i wanna take em off to either fix them or replace them.
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I have 3 sound bytes/videos. Probably best to listen with headphones or decent speakers to get the full effect. The issue has gotten worse. Seems to be worse especially in the a.m. when cold.
When I accelerate fairly quickly, not wide open, there is a weird noise of whooshing air, his or escaping air etc. It could be described as some type of whirring noise too.
I can let off the throttle and push slowly into it and it goes again. Only happens under a decent amount of engine load. Doesn't seem to matter what gear as long as it is under the same type of engine load.
It is coming from the passenger side engine bay as far as I can tell since I'm driving.
Here are the links: YouTube ....
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While driving, I occasionally hear a hiss, which seems to be a/c related. but just recently, I've heard an extremely high-pitched squeal/whistle. So high-pitched I had to slow down, turn off the music, and tell my wife to stop talking :P to hear it. Brakes are not being pressed. Definitely not a brake problem. How do I know? I parked the car, with engine running, opened the hood, and looked for the sound. nothing. I turned off the car and was walking inside when i heard it whistling behind me, mockingly. it stopped shortly after.
I'm thinking it might be a/c related, or some kind of pressure hose. (a/c is working fine otherwise, as far as i know). It's not air leaking from the tire. I've heard it on and off for about a week and the tire pressure is fine.
I'm more mechanical with computers than cars, but i have a basic understanding. it seems to be coming from the driver side, under the dash/under the hood.
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