Under the thermostat housing
The thermostat is located at the other end of upper radiator hose.
if you have a 3.3l v6, then you follow the upper radiator hose to where it connects to the block. It's around the throttle. The place where the hose connects can be removed, and the thermostat is in there.
The 1993 Oldsmobile Cutlass Sierra thermostat is located on the front of the engine. You can follow the water supply line from the radiator to the thermostat housing.
trace the lower radiator hose to the engine, that's where the thermostat located.
The 1993 VW thermostat can be found on the front of the engine. You can follow the top radiator hose directly to the thermostat housing.
THE THERMOSTAT IS ON THE BOTTOM HOSE BEHIND OF THE ALTENATOR. ITS A B1T
Follow the top hose back to the thermostat housing.
IF ITS A QUAD 4 THE HOUSING IS ON THE RIGHT SIDE OF THE VALVE COVER BY THE POWER STEERING BELT 2 BOLTS.
Follow the upper radiator hose from the radiator to the engine. Where it meets the engine there is the thermostat in the housing. Make sure you install the spring TOWARD the engine when replacing it. GoodluckJOe
The thermostat is under the housing where the upper radiator hose attaches to the engine.