Air switches from vent to defrost when engine under load - DodgeForum.com


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Air switches from vent to defrost when engine under load

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  #1  
Old 06-08-2011, 04:13 PM
1969usmc1988
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Default Air switches from vent to defrost when engine under load

Several years ago my 1996 1500 starting switching the air circulation from the main vents to the defrost whenever I put a load on the engine by accelerating. It doesn't matter if the A/C is on or not, Recirc or fresh. I have NO idea what could be causing this. I have reset the computer but that didn't help. Any ideas

John
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Old 06-08-2011, 05:43 PM
Ramzy
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Here is the info for "crazy vents" or "wacky vents". Do a search and you will find a boat load of threads.

It's a common problem.

https://dodgeforum.com/forum/2nd-gen...help-guys.html

https://dodgeforum.com/forum/2nd-gen...ild-vents.html

Last edited by Ramzy; 06-08-2011 at 10:48 PM.
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Old 06-08-2011, 10:02 PM
Stain96
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There is a vacuum line issue most likely... I had the same problem with my 1996; my mechanic told me it was one of the vacuum lines he replaced it, and it fixed my problem... If that is your problem then it is an easy and inexpensive fix. I would get that checked out before spending any big bucks...
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Old 06-09-2011, 06:43 AM
neilsrpcustoms
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It generally is going to be the line with the little white and black check valve in it. Sometimes the check valve itself just goes bad and doesn't hold constant vaccum to the dash feed.
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Old 03-02-2013, 06:58 AM
1969usmc1988
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the crazy vent advice worked. No more issues. Thanks again
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Old 03-02-2013, 09:40 AM
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