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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 06-29-2010, 01:08 AM
dirty97ram dirty97ram is offline
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Question ac stops blowing at higher rpm????

i have a 97 ram 1500 with the 5.2 and the ac works fine until i give it more gas an it gets to a higher rpm is this normal or is something wrong?
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Old 06-29-2010, 02:05 AM
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how high is high RPM? If you are really romping on it, I believe our trucks shut the a/c off at certain throttle positions for more power.

During normal driving, though, it should stay on. Maybe your belt is slipping?
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Old 06-29-2010, 05:46 AM
984wdram 984wdram is offline
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mine does the same thing. only happens to me when i mat it or have the cruise on and start goin up a hill. i think when the motor is under a load it des it.
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Old 06-29-2010, 08:26 AM
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It's called wide open throttle cut out. It shuts off the compressor to free up engine power.
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Old 06-29-2010, 09:23 PM
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If that isn't the cause, there is also a check valve coming off the plenum on the passenger side that can cause that problem. It's hooked up to your vacuum lines. Cheap, easy fix.
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Old 06-29-2010, 09:36 PM
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my 97 does that but it doesnt turn off it drops to like defrost LOL
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Old 06-29-2010, 10:43 PM
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ok thank you guys
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Old 06-29-2010, 11:01 PM
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Or it could be low on refrigerant . Low side switch cutting it out .
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Old 07-01-2010, 05:15 PM
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My a/c drops to defrost and floor mode when I am at highway speed and start up a long hill or bridge. It never cuts off but diverts untill my speed is back up. I think it has to do with the ammount of vacuum and throttle.

So what did we decide is the fix? The orifice check valve?
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Old 07-01-2010, 05:30 PM
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Vacuum check valve is usually the culprit.
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