02 Intrepid 2.7 Overheating Mystery
Hi. I have an 02 Intrepid with the 2.7 which I am fixing for my brother. I can't seem to get it to stop overheating. I flushed the radiator(flow seems fine), changed the thermostat, bled the system multiple times, and did a test for exhaust gases(negative). Water pump was changed about a year ago. Radiator and lower hose do not get hot while the upper hose gets burning hot. The fans do come on. Temp jumps all the way up dramatically when driving. It goes up so fast and erratically I was thinking there was air in the system, but when I bleed it I just get a continuous stream of bubbles and steam. While cool I get some coolant/some bubbles like I should. It never stops bubbling and venting steam once the engine is hot though. The only thing I can think of is that maybe I installed the tstat incorrectly.
Before I inherited this headache, he had overheated while on a long drive on the highway. I started by changing the tstat. There was also an oil pressure issue which I fixed. Took down the pan, cleaned it and changed the sump. I then replaced the timing chain tensioner as I had discovered the o-ring had blown off and was in the oil pan (this fixed the issue of the chain being loose and making all kinds of noise slapping around inside the cover).
Any help would be much appreciated. I figured I'd ask before I redo the thermostat, which I'm pretty sure I did correctly. Thanks.