a/c relay
#17
CF Veteran
Joined: Jul 2009
Posts: 2,158
Likes: 11
From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
it sounds like a vacuum line may have come off,just need to access the climate controller and look on the back,and all the vacuum lines to see which one is off,your engine maybe idling a little high also?
#19
CF Veteran
Joined: Jul 2009
Posts: 2,158
Likes: 11
From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
Hope this will help,your vacuum starts at the intake and goes to a bottle in the bumper on the right side,it then goes through the firewall from bottle to the climate controller,one of the ports on the back side of the climate controller goes to the heater control valve in the engine compartment next to your plastic bottle. You may have a line off under the dash.
#20
Thread Starter
Seasoned Member
Joined: Jul 2009
Posts: 398
Likes: 0
From: Bremerton
Year: 87
Model: Cherokee
Engine: 4.0
Finally had some time to mess with it today. So I check the vacuum lines and they were fine. Decided to start it up and what do you know the vents opened but as soon as I turned it to heat no more air?
#25
CF Veteran
Joined: Jul 2009
Posts: 2,158
Likes: 11
From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
Well it is not your fan,when it is in bi-level it will not blow as hard,but I assume it has changed from what was normal before,the only thing I can think of is a door is not opening all the way.
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