Got a strange problem that hopefully someone can shine some light on before I tear dash out looking. When my a/c is set on either dash or dash/floor vents, it will default to defrost when on accelerator. When I let off accelerator, it will switch back to dash and or floor vents. I am beating my head against wall and hope someone else has had this problem and can help with a fix. I don't mind pulling dash but I'd like to know what's going bad before i tear into it. Thanks in advance

 

thats weird.. but my buddy had the same problem (sorta). air only coming out of the defrost it was this little vacuum canister sphere looking thing thats tucked under the front bumper on the passenger side. he reconnected everything and its good to go!


hope this helps

 

I've got a '96 that does the very same thing. Since it is a RHD and I use it primarily for mail delivery, it really isn't much of a problem since when I'm accelerating I'm doing so very lightly from box to box. Out on the highway though...it's the same as yours. I've always thought it was either a vacuum or blend door issue (more likely vacuum). I never knew the Cherokee had that canister behind the bumper up front. I know I've owned lots of GM cars that had it though; looks like a black plastic football. They crack and/or the hoses come off quite easily.

 

it's there!

http://www.google.com/search?q=chero...F%3B1024%3B768

 

Thanks MrTowers. Now I know I have something to check if I have any unexplained vacuum issues. I appreciate the link to the photos.

 

NP!!