The thermostat is located in the housing where the top radiator hose connects to the engine. You will have to disconnect the hose and unbolt the housing to get to the thermostat.
I believe you want to drain the coolant, remove the top hose at the thermostat housing, remove the housing, replace the stat and gasket, reassemble fill with coolant and bleed the system.
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just need to know where it is located on car
The thermostat is on the top of the motor where the top radiator hose attaches to it. The housing for it should be held on with two bolts. Remove the bolts and lift up the cover. There's the thermostat.
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I would like to have a dimgram to show me how to put the hater core out and in on my 94 Pontiac Bonneville