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Old 08-21-2016, 01:35 PM   #1
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dash air wont shift from defrost outlets to dash outlets

Hi I have a 2002 holiday rambler ambassador and I cant get the dash air to come out the dash outlets but it does come out of the defrost outlets. The damper doesn't seem to be shifting. The air operated vacuum device doesn't seem to be making much vacuum when I pull the line from vacuum tank there is very little suction on the line. Has anyone else had this problem and if so how do I fix it. Thanks Dwight
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Old 08-21-2016, 01:40 PM   #2
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That's the classic symptom of a loss of vacuum. The flaps are controlled by vacuum. If it's a gas powered RV, the vacuum comes from the engine. If it's a diesel, they don't produce vacuum so they have a small vacuum pump on the front bulkhead under the cowl. It may be an electric pump or an air-powered pump from the air system. Default to defrost is a safety feature, in a case of failure, at least the windshield is kept clear.

See if the vacuum is working, then trace through the vacuum hoses to find the leak or break.
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Old 08-21-2016, 01:44 PM   #3
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Trace all your vacuum line there a good chance you have a broken or cracked line by the way you are describing the problem. Good luck and keep us in the loop.
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Old 08-21-2016, 04:30 PM   #4
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Dwight I think you will have a air operated vacuum pump I know the Dyn does, they also used a 12 volt vacuum pump later so check in the gen bay.
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