'83 300SD hot air question

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Mar 24, 2010 | 10:15 PM

tntractor

Thread Starter

Junior Member

Joined: Sep 2009

Posts: 14

'83 300SD hot air question

What would cause warm air to come out of the defrost always, even when fan is turned off.

Mar 25, 2010 | 12:11 AM

cycleboy

Senior Member

Joined: Jan 2008

Posts: 408

From: Carbondale, IL

vacuum actuators that have failed thus holding the vent open

Mar 29, 2010 | 08:54 PM

MB-TECH-38

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Joined: Feb 2010

Posts: 116

From: Sicklerville,NJ

could also have vacuum leak cause defrost is the default setting when vacuum is missing or low

Jerry

Apr 27, 2010 | 05:01 PM

190d19872.5

Junior Member

Joined: Apr 2010

Posts: 20

can I stop or closed the van somehow and where is it under the dash I can have access in my radio is not in my dash is it possible for me to have easy access anyone tell me

Apr 27, 2010 | 09:44 PM

cycleboy

Senior Member

Joined: Jan 2008

Posts: 408

From: Carbondale, IL

The vent will close if you replace the bad actuator with a good one or fix the vacuum leak.

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