Drove my car from Oklahoma to Ohio this week and ran great - no problems. One quick question: When the A/C is running, I have air blowing out all four vents, but I also have some blowing out the defrost vents (windshield 'freezes' over some). Is this normal?

Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

Can anyone help me with this? In checking the online manuals, it seems that I am supposed to have a defrost 'leak' in heater mode, but none in cooling mode.

Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

On my 84 300sd there is a vacumm pod deep in the center dash that controls the flap for airflow between the center (face) vents and the dash defrost vents.

if the diaphram becomes torn it usually flops to the defrost position

so, maybe you have a vacumm leak that is not pulling the flap all the way close?

on my car, their is a row of switches on a common vaccum rail (center console on the passenger's left leg kick panel - behind that panel) that is controlled by the climate control. The climate control send signals to all the little switchovers that redirect vacumm as needed to all the vacuum pods in various places in the dash to open and close vents and direct airflow based on the setting of the climate control.

Though it is a pay-for site - http://www.pindelski.com/Indexall.htm - does a tremendous job of testing these little switches (I found two of the 6 bad) and how to replace that crazy vacumm pod deep in the center dash.

ps - that site is a wealth of knowledge for other stuff as well

now, what I can't tell you is how different the systems are between mine (84 126 body) and yours. The one on the website above is a 126 body (I think an 82)

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~shell
As of 2/2010:
2001 CLK55 0o\=*=/o0
13.6 @ 106mph
10K mi
1984 300SD
260K mi and going and going...
97 S600
46K miles
1991 Sentra SE-R (extremely dorked with)
www.se-r.net