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#1
05-26-2009, 06:47 PM
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'78 300D - Center Vents and Defrost
I have read thru previous posts - I have, what I hope is a simple question:
When running AC on Auto Hi, I have cold air coming out the center vents AND the defrost vents. Clearly, more is coming out of the center vents but I am getting a good deal of air coming out the defrost (which can cause condensation to build up on the windshield). When I push DEF, I have most of the air coming out of the defrost vents, but some coming out of the center vents. Is this normal? Do I have a leak somewhere??? ryan
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE 
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#2
05-26-2009, 11:31 PM
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Sounds like a vacuum issue to me, IIRC the vents' servos are vacuum accuated.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
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#3
05-27-2009, 12:04 AM
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Sounds normal.
the center vents are for ac and the other vents are for heat. I had the same system in my 77 300D until it gave me troubles and i saw how expensive to fix and troublesome it is I went to manual climate control.
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1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k)
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