that's what it is, i have a lumina, had same problem, replaced the intake manifold. run like a top since
it could possibly have either a blown head gasket or intake manifold gaskets leaking
The thermostat is located under the thermostat housing which is connected to the engine side of the upper radiator hose, and bolts to the intake manifold with 2 bolts. To replace, drain and properly dispose of coolant, remove upper radiator hose, and remove thermostat housing. The thermostat sits in a recess between housing and manifold. Replace with correct thermostat with the correct side facing engine, new gasket and a little sealant.
if it's coming out the exhaust manifold it could be a blown head gasket or cracked head.
check your intake manifold gasket.
The manifold gasket is the same as the plenum gasket. The manifold gasket is a barrier between the manifold and the engine block.
Remove the thermostat housing screws and separate the housing, exsposing the thermostat and coolant, remove old thermostat and gasket. Reinstall new thermostat, gasket and coolant.
On the 3.1 LS model, the thermostat is in the intake manifold, just underneath the air intake, and between the exhaust crossover and the manifold. Trace the upper radiator hose back to a metal pipe from the engine, that is the thermostat housing. Replacing it means using a ratcheting box-end (10mm?) or open end wrench to start and finish, and fingertips for the rest, so NOT when the engine is hot! The thermostat fits horizontally into the manifold, and comes with its own molded gasket, which fits into a recess, and doesn't require gasket sealant. I just changed mine, so good luck.
by the lower intake manifold while you are doing this you should replace the intake manifold gasket anyway because it will leak sooner or later.
The engine thermostat is located in a water box, formed in the front of the lower intake manifold. The thermostat sits inside a housing, identifiable by its air bleed, and by the large radiator hose that attaches it to the radiator. To change the thermostat-- * drain the cooling system down to thermostat level (or lower) * remove the two (2) thermostat housing bolts, and the housing itself * remove old thermostat, discard gasket and clean both gasket sealing surfaces (pay attention to the orientation of the thermostat when you took it out; it only works one way) * install the new thermostat * place new gasket onto water box surface, over the thermostat, and center the thermostat in the opening of the intake manifold * apply gasket sealant, if necessary * place the housing over the gasket and thermostat, and torque bolts down to 250 in. lbs. * refill cooling system to compensate for lost coolant
Follow the top radiator hose to the engine. You have just found the thermostat housing. Remove the 2 bolts and replace the thermostat and gasket if your engine uses a gasket. Be sure to note the orientation of the original thermostat before removing it.
To change the thermostat-- * drain the cooling system down to thermostat level (or lower) * remove the two (2) thermostat housing bolts, and the housing itself * remove old thermostat, discard gasket and clean both gasket sealing surfaces (pay attention to the orientation of the thermostat when you took it out; it only works one way) * install the new thermostat * place new gasket onto water box surface, over the thermostat, and center the thermostat in the opening of the intake manifold * apply gasket sealant, if necessary * place the housing over the gasket and thermostat, and torque bolts down to 250 in. lbs. * refill cooling system to compensate for lost coolant
Happened to me. Termostat stuck closed. Changed thermostat. Test for possible blown head gasket. Happened to me. Termostat stuck closed. Changed thermostat. Test for possible blown head gasket.