Noisey fan coming from under dash
Thread Starter
Member
Joined: Apr 2008
Posts: 152
Likes: 3
From: Northern VA
2010 e350
Noisey fan coming from under dash
Ever since I got my car I have noticed a noise coming from under the dash, usually when I turn the car off or I first start the car. Something runs for about 4 seconds and stop then start back up for 4 seconds. It was fine until recently, now it sounds like something is worn out and now it does the same thing but sounds like grinding. It isn't loud, but you can definitely hear it.
Any ideas what it is? I was thinking it might be an extra evap fan, but I can't find one in the diagrams. Could it be the coolant recirculating pump?
http://daytonamercedesparts.com/part...6§ion=HVAC
Any ideas what it is? I was thinking it might be an extra evap fan, but I can't find one in the diagrams. Could it be the coolant recirculating pump?
http://daytonamercedesparts.com/part...6§ion=HVAC
Banned
Joined: Oct 2005
Posts: 4,957
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So you have ruled out the main HVAC fan? It also comes on when the car is shut down to remove moisture from the system and is sometimes referred to as an "evaporator fan". There is no such animal as you have said.
Junior Member
Joined: Dec 2014
Posts: 44
Likes: 6
'11 E550 , '13 GL450
AC motor needs replacement, i had something like that the start of the year. Something was def worked out, got it checked and they replaced the motor, I'm glad that i have extended warranty and don't need to pay for it, it was an expensive fix. I think it cost around 1500$ ++.
Hopefully that is not the case on yours....
Hopefully that is not the case on yours....
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MBWorld Fanatic!
Joined: Mar 2014
Posts: 3,107
Likes: 394
From: West Central Florida
2011 E550 P2 4M Sedan
I think there is a small fan on the comand system. I've heard something like that when using comand with car off in the garage. It was very quiet and I recall the sound of a small fan, but I don't notice when the engine is running at all.
I would start ruling out components by turning them on and off. First turn off climate and then drive some to see if sound is there. Then with car off in a quiet place, turn on comand using on button on front (not start button) and see if you hear the same sound.
I would start ruling out components by turning them on and off. First turn off climate and then drive some to see if sound is there. Then with car off in a quiet place, turn on comand using on button on front (not start button) and see if you hear the same sound.
Thread Starter
Member
Joined: Apr 2008
Posts: 152
Likes: 3
From: Northern VA
2010 e350
I finally figured out exactly where the noise is coming from, the dome light assembly.
It must have a fan motor or something inside. I am 100% sure the dome light area is where the noise is coming from.
Anyone have any ideas? I suppose step 1 is to take it out and look.
It must have a fan motor or something inside. I am 100% sure the dome light area is where the noise is coming from.
Anyone have any ideas? I suppose step 1 is to take it out and look.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,851
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From: Huntington Beach, Ca.
'17 Jaguar XF
Yes, there's a fan in there that people have posted about. I forgot what it's supposed to do exactly.... something about air circulation for a temp sensor? There's a reason it stays on after the engine is shut off.
