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Old 08-07-2009, 03:34 PM
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Join Date: Aug 2009
Location: South Carolina
Posts: 3
Center Vents in 82 300 not working

I have a 1982 300D and the center vents will only occasionally work. It seems the only time they work is when the car has been sitting in the sun and the interior is HOT. Can anyone tell me anything about this symptom?


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Old 08-07-2009, 03:53 PM
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Join Date: Feb 2008
Location: DFW area (north side)
Posts: 1,288
The center vents are controlled by a under dash vacuum pod. The pod is controlled by the CCU. I believe they are only supposed to open in the AC mode. Could be leaking POD, bad CCU, or bad switchover valve. Check the DIY section and you will find a lot of details of trouble shooting.

IIRC, Some have tied this POD to always be open.
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale:
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Old 08-08-2009, 11:18 PM
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Join Date: Aug 2009
Location: South Carolina
Posts: 3
Thanks Cr, I took the glove box liner out and could see that the actuator that controls the center vent flap was working. Turns out the actuator arm wasn't connected to the flap.

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