Originally Posted by briancole23
gauge reads around 150, am I safe in assuming that i need to replace my thermostat? If so, can someone tell me where it is located and if there is anything I need to know about replacing it (other than the usual two bolt and a gasket way that every other car that i have worked on has)? Thanks guys
If the digital gauge is reading 150 degrees you're probably collecting a lot of unburned stuff on the walls and into the oil. It'* not good.
You can drain a little coolant out of the radiator with a siphon hose,
remove the two bolts holding the thermostat housing on at the end of the upper radiator hose- I don't even remove the hose from the metal housing,
remove the thermostat with it'* rubber ring that seals it
replace with a new GM Delco which will come with the rubber ring, IIRC
be sure to put the pellet end into the upper manifold like the one you take out was
carefully thread the two bolts back on being careful not to cross thread (I did)
tighten to about the same as the ones you took off
refill the coolant into the radiator
run motor to heat up
after bottom radiator hose is warm (after a good drive) rev motor to 2500 rpm 5 times to get air out of heater core--it helps if car is up slight slope forward to help air flow uphill to radiator
carefully open screw on top of thermostat housing to let air out of that point -- I hold a shop towel over the screw but it has never spewed out on me, but be safe
You probably don't have a paper gasket between the metal housing and the intake manifold. All you have is a rubber gasket around the thermostat rim. The new one may not even come with a replacement now that I think back. I reused the original--check the box when you get it.