backtobirds
Registered User
My 90 has been overheating. Not what typically happens, oh no, that would be too easy. It runs a little on the high side of the "normal" (sometimes), or goes to the top of the guage. But then it will drop down. Then go back up. Then back down. Then back up. It got real hot one day, and was boiling out of the overflow. Out of coolant. So I filled it back up later, and noticed it was pretty eager to push out the overflow. So I replaced the radiator cap. Also, it has had a mystery coolant leak. Runs too good to be a head gasket, also doesn't blow white smoke. No leaks with a pressure tester. So ok, it has been pushing out the overflow, even back when it wasn't overheating. So is my overheating causing my coolant loss, or coolant loss causing my overheating. got real hot today after I replaced the cap, but the coolant wasn't boiling over. BTW, I recently did a coolant flush. HMMM, maybe I dislodged some crud that is now blocking the thermostat. The upper hose is hot and has good pressure, though, not like it is blocked. I'll try a thermostat tomorrow, but wonder if anyone else has any input. The car is acting different than any other overheat I have diagnosed. Driving me crazy. Thanks.