Whistling Noise From Interior Heater Fan - VW Forum

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MK4 – 4th Gen (1997–2004 EU) (US: 1999–2006)

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so ill turn on my heater or a/c and what not and it will sound good like its blowing fine then u can hear it slow like its clogged and u will hear a whistle. the air is still blowing just fine out of the vents but the whistle is coming from passenger side under the jockey box ya know. I wanna know if there is a filter or something i figured the passenger side bumper cut out was the filter for the heater and what not and there is nothing on it to make it whistle so if anyone can help me figure out how to fix this i would appreciate it the sound gets old and when that happens i just make my heater recirculate the air from the interior then the whistle stops. #1 · Mar 9, 2011 so ill turn on my heater or a/c and what not and it will sound good like its blowing fine then u can hear it slow like its clogged and u will hear a whistle. the air is still blowing just fine out of the vents but the whistle is coming from passenger side under the jockey box ya know. I wanna know if there is a filter or something i figured the passenger side bumper cut out was the filter for the heater and what not and there is nothing on it to make it whistle so if anyone can help me figure out how to fix this i would appreciate it the sound gets old and when that happens i just make my heater recirculate the air from the interior then the whistle stops. Sort by Oldest first Oldest first Newest first Most reactions #2 · Mar 17, 2011 now that some people are back... help me! haha #3 · Mar 18, 2011 Have this problem with mine currently...I'm assuming there's dust or dirt in the fan that needs to be cleaned...I usually just turn the stereo up but the fact that it's there really aggravates me. Last summer I replaced my pollen filter and while I did me and my friend who is a mechanic got ahold of a free trial sample of this stuff you spray into your HVAC system in your car (spray it into the hole for the cabin filter) and it cleans out all the bullshit in your car...gave that a try and the noise went away for a few months. I don't think it's the sound of your fan taking a shit, it's probably just dirty. Try replacing your pollen filter and before hand taking an air compressor or a really high velocity fan and pointing it in there and spraying it out or blowing it out. Just a thought...better than tearing apart the dash to find it. #5 · Oct 14, 2012

TTTurbo1.8T said: this stuff you spray into your HVAC system in your car (spray it into the hole for the cabin filter) Click to expand...

^^ Take these words to an auto parts place. Holy year bump... Is your car at operating temp, do you get heat from your car? Which fog do you mean, front defrost or rear? Is air blowing, wrong temp? explanation? Show more replies 0 Reply #4 · Oct 14, 2012 late reply, but were you able to find a solution to this? I am currently have the same problem, and mine actually does not clear away the fog...any suggestions? #6 · Oct 15, 2012 it was whistling because of this...

never knew where it was to clean it and man did it need cleaned #9 · Oct 28, 2012 So did the whistling go away right after you replaced that filter? 0 Reply #7 · Oct 15, 2012 Replace it don't clean it. #8 · Oct 16, 2012 i will when i go to the autoparts store. lol i cant imagine how dirty my mkIII is. I turn the blower on and dust blows in my eyes every now and then ha #12 · Oct 29, 2012 to be honest i actually still have a little whistle its not bad but now its coming from the defrost vent... not the passenger foot vent lol. oh well its not as annoying as it was before Insert Quotes Post Reply

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