i have a 2000 xj and my heat is stuck on the defrost and wont come out anywhere else. i took apart the center and saw a bunch of tubes coming out of the switch. i am new with cherokees and have not seen this set up before. is there a way i can fix this? any help will be apreciated, thanks.

 

Is ur check engine light on, throwing a evap or vacuum code? if u have a leak somewhere it wont adjust the vents/floor/defrost

 

the check engine light is not on, the vents and floor just stopped working the other day

 

Check for vac leaks.When you have a vac leak it outomaticly defaults it to defrost.Also check to see if your cruise works.If it dont then when you fix the vac leak that will fix both problems.They are both tied together.

 

my jeep is basic manual windows, manual locks, no crusie control

 

x2 on the vac leaks. The system will default to defrost when vacuum is lost. Safety issue.

 

is there any easy way to check for vac leaks? i've never had to deal with this before

 

Check the vac ball under passenger side bumper.

 

Easy way spray starter fluid at line when jeep is running it will reeve up I believe, watch for sparks flames, no smoking.g/l

 

thanks for all the help, i will have to wait for my next day off to try it

 

i had the same problem, but there was no leak there is a vac hose that goes from the intake manifold to the passenger side then tees off to the firewall and a canister, i took off the hose and cleaned it out with sea-foam ( there were like little filters in the hose that were clogged) put it all back together and it worked first try.

 

One of the pieces on the vacuum line is a one way check valve. If there is not a vacuum leak anywhere then the check valve could be bad. Take it off and see if you can blow through it in only one direction. If its bad all the stored vacuum in the tank will leak back to the intake when you are on the gas. Autozone sells universal replacements for a few dollars.