Where is the location of the thermostat on a 1994 Pontiac grand prix?
if you take the cap off of the radiator it is in there actually no its not. follow the top radiator hose to the engine. that is where your thermostat is. you will have to drain the radiator, remove the engine side of the hose and remove the thermostat housing to access it.
For pics and instructions check out the following website. These pics may not be exactly for your engine but the proceedure and location is the same. http://macgp.clubgp.com/howto/engine/tstat/tstat.htm . "G" At the point where the upper radiator hose clamps to the engine is the thermostat housing. Unbolt it and the thermostat is inside.