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2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Air switches from vent to defrost when engine under load

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Old 06-08-2011, 04:13 PM
1969usmc1988 1969usmc1988 is offline
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Join Date: Jun 2011
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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

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Old 06-08-2011, 05:43 PM
Ramzy Ramzy is offline
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Vehicle: 1998 Ram 1500 QC 2wd 5.2
Location: Southwest Arkansas
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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.



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Last edited by Ramzy; 06-08-2011 at 10:48 PM..
Old 06-08-2011, 10:02 PM
Stain96 Stain96 is offline
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Vehicle: 1996 Dodge Ram 1500
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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...
Old 06-09-2011, 06:43 AM
neilsrpcustoms neilsrpcustoms is offline
Join Date: May 2011
Posts: 104

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.
Old 03-02-2013, 06:58 AM
1969usmc1988 1969usmc1988 is offline
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the crazy vent advice worked. No more issues. Thanks again
Old 03-02-2013, 09:40 AM
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Old 03-02-2013, 09:40 AM
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