Help?
Thread Starter
Junior Member
Joined: Aug 2012
Posts: 47
Likes: 0
From: Central California
Year: 1990
Model: Cherokee
CF Veteran
Joined: Aug 2010
Posts: 1,168
Likes: 4
From: Williamsport, Pa
Year: 1997
Model: Cherokee
Engine: 4.0L
First of all, I'm not getting the video, just a picture. Second, it's quite possible that you have a blown head gasket. Exhaust gasses escaping into a coolant passage will cause pressure to build in the system. This is commonly noticed when the engine is cold and you start it and after a minute you shut it off and then open the coolant resivor. If you hear air pressure release then it's time to take it to a shop and have it checked.
Old School CF Moderator
Joined: May 2010
Posts: 9,652
Likes: 3
From: Chattanooga
Year: 2001
Model: Cherokee
Engine: 4.0
^^^Eh, I dont think its necessarily indicative of a blown head, its a renix era..they are known for finicky cooling systems. Anyways..I had the same issue with my 88..took a few different steps and never had the problem again, I went ahead and swapped in a new t-stat, replaced upper and lower rad hoses, did a complete flush, and then..replaced the entire reservoir and it solved my problem, I had a small (I mean damn small) crack in the reservoir that was causing the pressure to escape.
Thread Starter
Junior Member
Joined: Aug 2012
Posts: 47
Likes: 0
From: Central California
Year: 1990
Model: Cherokee
First of all, I'm not getting the video, just a picture. Second, it's quite possible that you have a blown head gasket. Exhaust gasses escaping into a coolant passage will cause pressure to build in the system. This is commonly noticed when the engine is cold and you start it and after a minute you shut it off and then open the coolant resivor. If you hear air pressure release then it's time to take it to a shop and have it checked.



