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Old 12-17-2003, 11:59 AM
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Join Date: Nov 2002
Location: Charleston, SC
Posts: 77
Heat/Air Duct problem???

As the subject line indicates, I'm not sure what kind of problem I have.

When I start up my 95 E320 wagon, there is a sort of muffled pop under the dash behind (I think) the center vents.

The image I have is of a baffle that is opening...sticking, then opening with a pop.

Thinking it was probably a baffle in the air duct work, I've tried to duplicate it by switching to the various climate control modes, but it only happens on start-up.

I've searched the forum and gone through my CD looking for something...but haven't found anything yet that sounds like the culprit.

Anybody have an idea?


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Old 12-17-2003, 12:11 PM
MikeTangas's Avatar
Senior Member
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Sounds like the main flap slamming open/shut as soon as it receives vacuum from the now started engine. The 560 does that if I have the ACC set to off, it slams with a solid thud on start-up.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

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Old 12-17-2003, 06:43 PM
jc300e's Avatar
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Join Date: May 2000
Location: Location: Norcross, GA
Posts: 119
my 92 400e does similar.... a muffled "thud - thud -thud" when the heater temps are used. I've also noticed that I do not have airflow from my passenger floor vent...

Could that be the vacuum attempting to open a stuck passenger floor vent flap? If so, is it accessable for easy repair?
'87 300E
'92 400E
'06 ML350
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