Hey, i have a 1991 Jeep Cherokee. the heater controls that control were the heat comes out work, but only sometimes. do you know if they work off a vacuum or is it the linkage, but they work sometimes. you can move it but it wont always change were the heat come out.

 

I believe there vacuum controlled. Here's a site with OEM Jeep-Mopar parts catalogs. (With your year.) There's exploded views in the catalogs. Also in PDF Format, so you can down load them. (http://www.xjjeeps.com/tech_referenc...section=2&ID=0)

 

hey thanks, i figured it out. theres a vacuum line that comes off the intake manifold and goes across to passenger side. i cleaned them out with sea foam and it works great now.

 

cool