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'83 300SD hot air question

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Old Mar 24, 2010 | 10:15 PM
  #1  
tntractor's Avatar
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Default '83 300SD hot air question

What would cause warm air to come out of the defrost always, even when fan is turned off.
 
Old Mar 25, 2010 | 12:11 AM
  #2  
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vacuum actuators that have failed thus holding the vent open
 
Old Mar 29, 2010 | 08:54 PM
  #3  
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could also have vacuum leak cause defrost is the default setting when vacuum is missing or low

Jerry
 
Old Apr 27, 2010 | 05:01 PM
  #4  
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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
 
Old Apr 27, 2010 | 09:44 PM
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The vent will close if you replace the bad actuator with a good one or fix the vacuum leak.
 
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