Help with vacuum problem !!!!

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Jul 5, 2024 | 07:23 AM

sharp801

Thread Starter

Junior Member

Joined: May 2014

Posts: 48

Likes: 1

From: Gilbert,AZ

Year: 1997

Model: Cherokee

Engine: 4.0

Help with vacuum problem !!!!

Can someone show me where to look for Dorman's chart for check valves. 1997 jeep cherokee 4.0.

Jul 5, 2024 | 10:09 AM

lawsoncl

CF Veteran

Joined: Dec 2017

Posts: 4,365

Likes: 1,215

Year: 1989

Model: Comanche (MJ)

Engine: 4.0

Need some more details, but since you said vacuum, I'm guessing you're looking for Dorman 47170.

https://www.cherokeeforum.com/f2/ac-...-valve-238279/

Jul 6, 2024 | 06:03 PM

sharp801

Thread Starter

Junior Member

Joined: May 2014

Posts: 48

Likes: 1

From: Gilbert,AZ

Year: 1997

Model: Cherokee

Engine: 4.0

help with vacuum problem

My problem is when I accelerate my a/c changes to defrost vents. It just started just the last time I drove it. I checked all the lines and don't see anything out of place. I'm hoping for simple fix. Thanks

Jul 6, 2024 | 07:32 PM

lawsoncl

CF Veteran

Joined: Dec 2017

Posts: 4,365

Likes: 1,215

Year: 1989

Model: Comanche (MJ)

Engine: 4.0

The check valve could be the culprit. Take it out and see if you can only blow through one direction. Also check the lines and the vacuum reservoir behind the passenger side of the bumper.