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Old 08-05-2018, 01:57 PM   #1
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Brand: Thor Motor Coach
Model: windsport hurricane 34f
State: Tennessee
Posts: 47
THOR #9067
dash a/c goes to defrost under load

2015 windsport 34f, on long hill climbs my a/c changes from vent to defrost.comes back again when I let off throttle for a few secs. I have experienced this withholder chysler minivans and it was a lack of vacuum to a/c control head under load. I found my windsport has a vacuum cannister and it seems to hold vacuum,no obvious leaks found. has anyone else had this issue?
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Old 08-05-2018, 02:36 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 1,452
THOR #6411
When the engine is not producing sufficient vacuum, the vacuum canister must supply the needed vacuum as you stated, There must be a vacuum leak in the system that the canister can not overcome. You can isolate each component in the system and using a hand held vacuum pump test each component. Usually you will find a split in a vacuum line where it connects to a component.
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