Did you replace the bottom Rad. Hose? If you did, did the replacement have a spring in it? That is the intake to the water pump, and the spring keeps it from collapsing. And yes fail safe t-stats are crap! Check that hose and then do the nose up deal.
I didn't replace any hoses when I changed tha radiator because I put new hoses on about 1-2 years ago and they still seemed pretty good. Even with the engine running they don't seem to be sucking down like anythings pulling on them...but they don't seem to be pumping up either.
I'll go to my local Jeep dealership today and get myself a MOPAR t-stat. And I'll check my engine this morning and see if the system is pressurized. It was a cold night so nothing should come out of Rad cap.
I think your system has an air bubble man. The hoses should be full of coolant. I usually start the thing and pump it with my hand to get the bubbles out. I usually start with the rad cap off, and just burp it almost. Then when it starts to get warm i put the cap on.
It does sound a lot like when my head warped though. I replaced the whole engine because it was at 350,000 km. Usually that is the life of the Cherokee engine. But im confident you have a bubble. If it is full for sure and doing this... Your F***ed.
Well I'm going to try to burp the system again this afternoon and see if I get an results. I haven't tried squeezing the hoses so I'll give it a shot. And the system isn't totally full. When I checked it amd ran it yesterday to see how she was doing the overflow tank was below the add mark so we'll see what happens. I'll ler you guys know what's going on in a few hours. Thanks alot for the tips so far.
Well everyone, I had a few minutes to run out and try to burp the system this morning. It was a chilly night last night it took a few minutes to get the engine going but since it's still cool out I could see steam coming from under the headers once the engine was hot...and once I got a closer look I could see coolant coming from where The gasket is. I'm no mechanic, just a do it yourselfer, but I'm positive it's my head gasket. And upon even further inspection I could see a tiny crack leaking coolant right behind the t-stat housing...so looks like that head is done with.
Which brings me to my next question, should I replace the head or the whole engine? Money is an issue...as always. Ideally I'd like a stroker but just to get the thing running is more important.
I had this issue with my 98 4.0l 5speed. its was chugging out in stop and go traffic, i thought it was over heating (seemed to be running very hot, no gauges, only happened on hot days in stop n go traffic) it turned out to be the crank position sensor.
If your symptoms are similar, might consider. will show a code on computer scan.