fan noise when accelerating????

**need help** · 06-05-2007,09:04 PM

Hi all new to this site right just brought an 02 plate Audi A4 1.9 TDi and all has been fine. BUT now i am noticing a fan like noise every time i accelerate. Aircon unit will be off and vents closed but will still hear this fan like noise coming from the dash area anyone any ideas please HELP

Regards
Dave

**aaaa4aaaa** · 07-05-2007,06:03 AM

Switch on the re-circulate function and redo the test, I've also had it, was merely the wind forcinging in via the vents. I normaly have the auto recirculate function on so it is not always there..

Regards

E

**madfella65** · 08-05-2007,12:35 AM

is this by any chance the sound of your turbo that you are hearing?

**need help** · 08-05-2007,08:19 PM

Thanks both for your reply i thought it might be the turbo as well but because this is my first audi tdi just wanted to ask the question. If it is the turbo it has only just started to work and seems very noisy. Going to have a dig around the engine on my day off wish me luck.

**hendy** · 09-05-2007,06:15 AM

got same problem in my passat i think its turbo noise ........does your car sound loud when you lower windows ????

**need help** · 11-05-2007,10:37 AM

Right the fan noise has now gone but so has all the cars power so iam thinking that the noise i was hearing was in fact the turbo and everything was fine. But now their is somthing wrong with the car can any boudy help?

**nickynibbles** · 11-05-2007,07:36 PM

Pop the bonnet with the engine running, rev the engine hard, if you cant hear the turbo spin up then you've got a problem with the turbine blade i'd hazard a guess. May just be jammed, if its disintergrated then you'd of heard bits going through the exhaust! Surprised your not getting an ECU warning light though? If you can hear the turbo in the above test give it a high speed motorway run (as in 70mph of course!) to blow out any cobwebs. If you cant hear the turbo, get it to the garage! I get the wind noise on my V6 and the recirculation button works by the way!

**need help** · 12-05-2007,04:05 PM

Thganks for the reply. the problem was getting worse so i disconnected the MAF sensor and removed the air filter gave it all a dam good clean and touch wood the care is driving better than ever. But will take it for a high speed run at 70mph over the week end and see how we get on (Fingers crossed)

**hendy** · 13-05-2007,08:37 AM

sorry to sound like a total thicko but what is the MAF sensor ?? and where is it located

**onzarob** · 13-05-2007,10:04 AM

Originally Posted by hendy

sorry to sound like a total thicko but what is the MAF sensor ?? and where is it located

Mass air flow or MAF, it senses the air going into the turbo so the ecu can control the amount of boost. Its located after the air filter and has a connctor in it.

See below

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