C class w204 Fan whirring noise

[d0bbsy]

Hi Everyone,

I've noticed a whirring noise coming from behind the dash recently. It comes and goes but its starting to annoy me, I have changed the fan blocker motor but its still there with the a/c on or off and only stops when switching the heater controls off.

Any idea's what I should check.


Cheers

 

[toteimerced]

I had a similar problem on an Audi a few years ago, I turned out to be, a piece of insulation had dropped down and was rubbing on the fan blades, might be worth a look.

 

[d0bbsy]

I had a similar problem on an Audi a few years ago, I turned out to be, a piece of insulation had dropped down and was rubbing on the fan blades, might be worth a look.

Thanks for the reply. I changed the fan blower a few weeks ago behind the glove box and didn’t notice anything as it’s in its own compartment. Is there a secondary fan do you know ?

Thanks

 

[toteimerced]

I think there maybe a small temperature sample fan, for the climate control to set it’s temperature, but I’m not really sure if Mercedes use them tbh.

 

[d0bbsy]

I think there maybe a small temperature sample fan, for the climate control to set it’s temperature, but I’m not really sure if Mercedes use them tbh.

ah ok thanks for your post, I may take out the stereo and go for a drive see If I can hear where its coming from.