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#1
05-31-2005, 12:55 PM
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'87 300D Water Vapor from Cneter Vents
Well, teh AC works after the evaporator core replacement, but now I have another strange problem. After running the AC for about 30 minutes, what appears to be steam comes out of the center vents. If I shut down the AC for about five minutes, this problem goes away but comes back after about 30 minutes. If someone can either help with this problem, or direct me to a good link, it would be appreciated.
On another note, my father and I did a podectomy on his 81 300D about a month ago. His newest quirk is that at low speeds, the AC works like a champ, but once you get above 50 mph, warm air blows out of the left center vent, and the left vent by the driver's door. Could this be a monovalve problem? We swapped out the CCU this past weekend with no solution to the problem. Mike
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Mike '80 300D '84 300D '85 300D '87 300D 
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#2
05-31-2005, 12:56 PM
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Maybe your condensate drain is clogged??
Danny
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination
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#3
05-31-2005, 01:01 PM
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Maybe the evaporator is icing up. When the compressor shuts off and the evaporator warms, the ice begins to melt and is blown out the vents in the form of vapor.
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1982 300D, black w/ palomino leather, 203K 2001 E320, champagne, 105K (Mom's) 1999 Dodge Dakota, squeaky & battered, 142K
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#4
05-31-2005, 01:14 PM
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I can state this as a fact for your particular car, but on nearly all A/C systems there is a temp switch to turn off the A/C compressor once the evaporator goes below freezing temperatures. This is to prevent excessive condensation and the collection of ice. When this switch fails it is very common that water vapor will blow from the vents.
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1984 300D / The only Benz I have  Completed weekend projects
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#6
05-31-2005, 02:32 PM
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Quote:
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1982 300D, black w/ palomino leather, 203K 2001 E320, champagne, 105K (Mom's) 1999 Dodge Dakota, squeaky & battered, 142K
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#7
05-31-2005, 11:33 PM
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water vapor
My 240 does that -- and it has been the condensate drain clogged so far -- the water needs some time to build up, then sprays out. I'd check that out first -- pretty simple -- before I progressed to more complicated possibilities ...
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