99 xj has no pressure after driving extended periods of time, the rad cap is cool to touch alll the time, had poor heat, flushed core and heat got better but the no pressure cant be normal ?

 

How is your radiator cap?

 

I replaced it with a new one

 

Got access to a pressure tester?

 

Ok

 

Check the cap too. Would not be the first time a new part was defective out of the box.

 

How do i do that

 

This is a shot of my pressure tester I use with my '00 XJ. The pump itself is used alone on the radiator to check if pressure holds. You put on the black adapter, just like putting on a radiator cap, and can put your radiator cap on to check to see if that holds pressure.

 

FWIW I replaced my OEM radiator cap with another OEM radiator cap from the Jeep dealer. It wouldn't hold pressure. Brand new out of the box. Said screw it and grabbed one from the local NAPA and it holds pressure just fine.

 

Thanks