hi everyone. My car recently having few knock sounds every time i switch on/off the heating. Anyone can give some advice what's that? thanks in advance
knock sounds when switch on/off heating ãA4 B7 1.9TDIã
- Thread starter Rock
- Start date
Maybe the flap closing, try it in E mode. Does it only do it when the recircluating button is on?
the sounds happens :
every time i turn on/off the key, i mean give the power to the car electric device,but not turn on the engine. doesn't matter the heating is on or off.
every time i turn on/off the recircluating button
every time i switch on/off the heating, i mean the "OFF" button.
but the the knock sounds from "turn on" is different from the sounds from "turn off". sounds like something knocked from two different way.
every time i turn on/off the key, i mean give the power to the car electric device,but not turn on the engine. doesn't matter the heating is on or off.
every time i turn on/off the recircluating button
every time i switch on/off the heating, i mean the "OFF" button.
but the the knock sounds from "turn on" is different from the sounds from "turn off". sounds like something knocked from two different way.
PetrolDave
Registered User
If the knock is coming from under the dash it could be one of the air distribution flaps sticking - I had this a few months ago and was able to diagnose which motor using VCDS (VAG-COM). On investigation I found that the motor was OK but the operating lever had jammed.
was on motoway this morning, and it's raining. so i've also found i could hear the same noices as soon i use liquid screen wash, and every time
thanks for the experience.but is there anything should be replaced in this case?
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E mode doens't make any different,but no noices from switch on/off the E mode
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Dave,
how did you cure this what methods were used to un jam!!!!! as mine doing the same and wont de -mist windscreen help!! Vag says flapp jamed....
how did you cure this what methods were used to un jam!!!!! as mine doing the same and wont de -mist windscreen help!! Vag says flapp jamed....
Problem found with the air recirculation motor, My part number is : 8E2.820.511D. Made in Spain
i can't find the exactly same one on ebay. will phone the dealer on Monday
i can't find the exactly same one on ebay. will phone the dealer on Monday
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PetrolDave
Registered User
Removed the motor (3 screws IIRC) and separated it from the mechanism which I checked was free to move by hand and then refitted the motor to the mechanism. That's all I had to do.
