Quote:
Originally Posted by flash968
if the thermostat is stuck closed, the car will essentially boil over and push the coolant out of any exit above it that is open.
a quick way to see is to check the temperatures of the upper and lower hoses. they should only be about 20 degrees different. if one is cool, and one is hot, either the thermostat is not opening, or the pump is not pushing the coolant
if you go to change the thermostat, check it first for operation before installation. dangle it on a string in a pot of water and bring it to boil (don't let it sit in the bottom of the pot). if it opens at the right temperature, you're fine. my experience is that about 1 out of 10 new thermostats do not open and close like they should, and about 1 in 30 don't work at all.
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Ah, that makes sense. I'll check that out before I keep going. Thanks!