Only defrost works in 89 Cherokee
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Junior Member
Joined: Jun 2011
Posts: 35
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From: Northern Idaho
Year: 1989 / 1998
Model: Cherokee
Engine: I-6
Only defrost works in 89 Cherokee
I had a 86 Comanche and when all I could get was defrost my issue was the vacuum tank in the right front finder.
This is an 89 Cherokee with a 98 Cherokee stuffed inside the 89 body.
This project was done by a father and son, no idea what the did right or wrong.
I have the issue again, I just get the defrost to work. It has no vacuum tank in the right front fender. I did find a metal vacuum canister laid out by the heater fan, but not sure if that goes to some other control.
I also have high fan or nothing at all. Before I tear into the dash, I thought I would ask.
Thank you for your thoughts and prayers, beer for everyone
Ranger Rick
This is an 89 Cherokee with a 98 Cherokee stuffed inside the 89 body.
This project was done by a father and son, no idea what the did right or wrong.
I have the issue again, I just get the defrost to work. It has no vacuum tank in the right front fender. I did find a metal vacuum canister laid out by the heater fan, but not sure if that goes to some other control.
I also have high fan or nothing at all. Before I tear into the dash, I thought I would ask.
Thank you for your thoughts and prayers, beer for everyone
Ranger Rick
CF Veteran
Joined: Nov 2008
Posts: 7,874
Likes: 100
From: Northern Ontario, Canada
Year: 1990, 1999, 2000
Model: Cherokee
Engine: 4.0
you have a vacuum leak somewhere. default goes to defrost so you can at least keep your windshield clear.
since you don't have the vacuum ball, i would start there. follow the vac lines up inside the engine compartment to the firewall. there is a T elbow that commonly fails.
and for your other problem, it is your blower motor resistor. this is found under the dash, behind your glove box. it is behind the triangle shape plastic cover. simple to change out, it's just two screws to remove the resistor, but could be hard to get your hands in there.
since you don't have the vacuum ball, i would start there. follow the vac lines up inside the engine compartment to the firewall. there is a T elbow that commonly fails.
and for your other problem, it is your blower motor resistor. this is found under the dash, behind your glove box. it is behind the triangle shape plastic cover. simple to change out, it's just two screws to remove the resistor, but could be hard to get your hands in there.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
I have the issue again, I just get the defrost to work. It has no vacuum tank in the right front fender. I did find a metal vacuum canister laid out by the heater fan, but not sure if that goes to some other control.
Do you have cruise control?
Do you have cruise control?