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Old 05-12-2020, 12:33 PM   #1
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Ac/heat/defrost switch not working

This question may be beyond your scope.
My dash control switch the directs air flow to the defrost discharge, vent discharge, AC discharge and floor discharge does not work. The switch worked the day before in the AC position. My investigation seems to indicate that there is no vacuum pressure supplied to the vacuum plug block at the back of the switch control. I believe I have followed the vacuum line to a source that has vacuum. The line goes through the firewall that is sealed with spray foam Insulation and doesn’t move so I don’t know if it is the same line. Can you help trouble shoot this?
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Old 05-12-2020, 01:50 PM   #2
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Welcome to iRV2.

Going to need a bunch of info to be of any help .

Is this a Class C ? Year ?
What chassis is the RV built on ?
Have you been able to locate a vacuum reservoir under the hood ?
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Old 05-13-2020, 12:29 AM   #3
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Sorry, I have a Class A 2013 Fleetwood Storm MS28 on a Ford chassis. Yes I have found the vacuum tank and there is a vacuum present.Thanks
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Old 05-13-2020, 10:27 PM   #4
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If there is vacuum at the reservoir and none at the control head , you have to trace the supply line through the firewall to the control head and repair or replace it to repair the leak ( blockage).
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