Heater / Blend door / vaccum issue?
#1
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Year: 1993
Model: Cherokee
Engine: 4.0
Heater / Blend door / vaccum issue?
I cant seem to pin point my issue. Any help would be appreciated.
I am having an issue with my heater.
If my Jeep is at idle, everything works as designed. While under throttle, If I have the control switch in the "Heat" position it will switch to defrost. Close the throttle and all goes back to normal.
Do I have a vaccum leak, a line connected wrong, or a bad component?
Thank you!
1993 XJ 4.0 AW4
I am having an issue with my heater.
If my Jeep is at idle, everything works as designed. While under throttle, If I have the control switch in the "Heat" position it will switch to defrost. Close the throttle and all goes back to normal.
Do I have a vaccum leak, a line connected wrong, or a bad component?
Thank you!
1993 XJ 4.0 AW4
#6
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Year: 1985
Model: Cherokee
Engine: 2.5L
I think I have the same problem on my 85, I even hear a squeaking in the heater box area when going from open throttle to closed throttle with it in the Off position. Would mine start at the tin cans on the inner fender as I don't think I have the ball under the bumper?
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#9
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Do you still have the crappy heater control valve on the heater hose going to the heater core? That is also vacuum controlled. If so check out the vacuum line to it or you van remove it all together and plug the vacuum line to it. I do know that your problem is vacuum related. Make sure to check out every vacuum line in the engine compartment. I'm not sure but I think that you also have some vac lines under the dash to the hvac controls.
#10
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Year: 1993
Model: Cherokee
Engine: 4.0
The PO is a total hack. Thats the reason I am doubting his work as far as the routing goes. I will dig a little farther. ..
#11
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#13
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Year: 1990
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