Ac switches to defrost at 55 mph give or take
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Newbie
Joined: Jul 2014
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Model: Cherokee
Ac switches to defrost at 55 mph give or take
Not sure the cause or what would cause my AC to flip to defrost at 55 mph give or take. It only happens at higher rate of speeds and doesn't go back to AC until I slow down. What would cause and where should I start trouble shooting first? Vacuum lines? Still weird to me that it happens at higher rate of speeds.
Thanks,
Tony
Thanks,
Tony
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 12
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
The higher the RPMs, the less vacuum your engine makes.
You are correct in assuming you have a vacuum leak somewhere. It could be in any hose or fitting. This is going to be a process of elimination.
You are correct in assuming you have a vacuum leak somewhere. It could be in any hose or fitting. This is going to be a process of elimination.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Not sure the cause or what would cause my AC to flip to defrost at 55 mph give or take. It only happens at higher rate of speeds and doesn't go back to AC until I slow down. What would cause and where should I start trouble shooting first? Vacuum lines? Still weird to me that it happens at higher rate of speeds.
Thanks,
Tony
Thanks,
Tony
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