1995 c220 A/C problem. only coming out window vents when hot - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 08-11-2009, 06:14 PM Thread Starter
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1995 c220 A/C problem. only coming out window vents when hot

i have a 1995 c220 and when its cool out or not to hot the ac is cold and blows fine but when hot out or car is hot when i select for it to come out the dash vents it only comes out the vents near the glass and does not switch. what could be the problem?
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post #2 of 4 (permalink) Old 08-13-2009, 05:06 AM
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The problem is a vacuum leak. The dash vents are controlled by vacuum elements (pods) that actuate flaps to control the air flow to the desired place. The pods for the defrost vents are open by default as a safety measure, so that if there's a vacuum leak, they don't close and the airflow is constantly directed at the windshield. The fix is to track down the source of the vacuum leak and possibly to replace some or all of the pods. That requires removal of the dash ($$$).

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post #3 of 4 (permalink) Old 08-22-2010, 10:06 PM
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I have a 1994 E420 that has a similar but different problem. In my car, air conditioned cold air blows out of the two center front dash vents but extremely hot air blows out of the vents on either side of the dash. Can this be the same type of problem?
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post #4 of 4 (permalink) Old 08-22-2010, 10:32 PM
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I opened the topic in W124 with the same issue and it is already pretty well explained.
In case of vacuum control failure the default is to blow all the air via defrost slots and side vents. All other options need working vacuum elements. Those elements wear out and the diaphragms inside start leaking. At least that what I found in my 87 E class, but I bet the problem is similar on yours.
If you don't find similar explanation in your model section, I think you can pretty well use the one from W124
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