Last Saturday I was driving and I noticed my temperature gauge was starting to rise. When it got just before the red zone i pulled over and turned the jeep off. Naturally, I popped the hood to see what was wrong. Checked coolant, plenty in there. No smoke from the engine, in fact, it didnt seem all that hot to me, I had only been driving for about 15 minutes when it started to overheat. I let the engine cool down and I started it back up again and drove a bit further...and again..the engine started to overheat, so i pulled over again. The third try, after letting it sit for a while, I tried to make it home..only about a 3 minute drive, and I noticed the temp going up again, except this time right before it hit the red zone it went back down, all the way down to under normal running temp. Then, it would go back up. So far i have replaced the thermostat and the coolant temp sensor..and im still overheating. Has anyone had this problem?? I have no idea whats going on! It's like the radiator is somehow clogged.
1995 ZJ Limited
IRO 5.5" Critical Path Long Arms
Armored and Aussie locked
I had this problem on my jeep. first it was overheating, then it was underheating. So I did the same as you took out the stat and replaced it three times. didn't work so I took the radiator out and cleaned all the mud and cheaked the flow, seemed fine. put it all back together, nothing. So I replaced the water pump even though the old one seemed fine. Don't know what caused it to first overheat but what I found was the proplem was that I didn't bleed out the system properly. I had an air bubble. I took the cap off the radiator, filled it up, turned it on and let it get hot, then filled it till it poured over and put the cap back on. hope my stupid mistake helps.
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