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  #1  
Old 09-04-2007, 07:45 PM
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Join Date: Feb 2006
Posts: 34
300E A/C vent problems

I have a 91 300E. The air blows out the defrost and center vents at all times. It doesn't matter if I press the bi-level button or vent only button. If fine until at night the frost starts building up on the windshield.

Where do I need to start?
pods under the dash?
or do I have a bad Climate control panel?

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  #2  
Old 09-04-2007, 08:09 PM
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Join Date: Sep 2007
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Similar but different

I have a 97' E300D with a somewhat similar problem.
My A/C blows cold out the right side of the dash but hot on the driver's side.
I've been told this is a vacume door issue but haven't gotten into it yet. Also was told it could be the "sunsensor" or pressure sensor. Ultimately we may have a similar root cause. Any thoughts?
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Old 09-04-2007, 08:47 PM
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Join Date: Dec 2000
Location: AL
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The problem with the '91 is most likely the defrost vent vacuum pod. You are lucky, this one can be reached without removing the dash.

The problem with the '97 is most likely a low refrigerant charge.
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  #4  
Old 09-05-2007, 11:32 AM
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Location: DFW / Collin County Texas
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On the '91 W124, the defrost pod is probably torn and/or leaking. The default position is defrost ON, and engine vacuum pulls it to closed position (OFF), but it can't/won't be pulled if it is leaking. I have never replaced one on a W124, but on my W126 it is readily accessible and removable if you take out the glove box liner (I just did this the other day). You can rig the defrost flap closed until your new defrost pod arrives (that's what I did). I imagine all of this is probably similar for the W124.

On the '97 W210, brewtoo is correct. Check the charge first. If the charge checks out OK, check the mono- or duo-valve.

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