2002 dodge ram 1500 defroster problems


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Old 05-10-16, 06:01 PM
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2002 dodge ram 1500 defroster problems

I have a 2002 dodge ram 1500 and the defroster Blows warm air from the vents only and not through defroster. Anybody know what the problem could be?
 
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Old 05-10-16, 06:10 PM
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When you change the function to any other function....does the air change vents at all ?
It sounds like a stuck damper.

In checking further it looks like you have a vacuum operated door/damper system. You may have lost the vacuum supply source under the hood to the A/C controller. Do you know where the vacuum storage canister is on the passenger side ?
 
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Old 05-10-16, 07:46 PM
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Is it gas or diesel? Same principle on both, but diesel is a positive pressure engine and requires a separate vacuum pump to operate the blend doors and 4wd.
 
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Old 05-10-16, 08:17 PM
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My '99 Ford diesel uses a belt driven vacuum pump. I'm on my 4th or 5th one.
 
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Old 05-11-16, 03:35 AM
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At least yours is external. Cummins is gear driven in front of the power steering pump (common shaft), so it all has to come out. Like taking a basketball out of a space meant for a baseball
 
 

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