My air conditioning/ heater in a jeep cherokee 1998 is stuck on defrost... I need to get this fixed!! Does anyone else have a similar problem?? Please any advise on how I can fix it will help a lot!

 

Check for a broken vacuum reservoir or broken vacuum line. The reservoir is just behind the passenger side of the front bumper. There is a small vacuum line at the firewall next to where the A/C lines enter the cab, trace the line from the firewall all the way to the reservoir and look for rotted or broke sections. I bet your cruise control doesn't world either.

 

U most likely have a vacuum leak somewhere......defrost is the factory vent default position. Just gotta start looking for vacuum leaks....start with the ball/vacuum canister behind the front bumper.

 

Like previous posters have said, there's a vacuum leak.

Open the link below and scroll down to post #51.

There's pics of the vacuum system in the engine bay.

https://www.cherokeeforum.com/f2/gre...e-6558/index4/

 

Thanks guys got it fixed great advice!!

 

What did you find that got it fixed?

 

There was a hose that was broke I just had to look hard for it