If it is like my 2000 Malibu V6, this housing is located behind the exhaust crossover pipe. This is the pipe from the front exhaust manifold to the rear exhaust manifold. If you remove the air intake ducts and and airflow meter, you will get a better view of the housing, the top radiator hose is attached to it. If you remove the exhaust crossover pipe, it will be a lot easier to remove this housing. I believe you can remove the housing without removing the crossover pipe, but it will be a little trickier, especially upon installaltion. The bolt sizes are either 10mm or 8mm, don't exactly recall. The bolt sizes on the exhaust crossover are 13mm, a deep socket is needed here.
the thermostat is in the coolant cap
Should be in a removable housing at the engine end of the upper radiator hose
Up front, on top of the engine, next to the thermostat housing.
Yes.
Follow the upper radiator hose back towards the engine. The hose will be connected to the thermostat housing. The thermostat is under the housing. Drain off some colant, remove upper hose from thermostat housing, remove the two bolts holding the housing to the engine, remove the housing, remove the thermostat, take note that the thermostat spring faces the engine so as not to install backwards.
Yes. '99-'01 same
Follow the upper radiator it will lead you to the thermostat housing.
marks timing chain 99 Malibu 2.4
drivers side, tucked behind the exhaust tunnel on the side of the motor, follow the radiator hose to it. they are tuff to change
Yes. '97-'05 the same.
lewis.grasch@yahoo.com
where do i find the thermostat for 99 cavalier