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drain the coolant from radiator remove upper hose from thermostat housing clean housing and block install new thermostat with the spring end toward the block pointed to radiator use a new gasket and a small amount of gasket sealer when tightning the bolts back on the thermostat housing be sur to run them down evenly or you will crack the housing reinstall hose add coolant start and check for leaks
first you need drain engine coolant down below thermostat. what engine type 3.8 or 3.4 need to know.the 3.8 engine thermostat housing on top intake follow top radiator hose to thermostat housing.the 3.4 engine you have to remove air filter housing with air inlet duct with mass air flow sensor.you have to remove throttle body with coolant hoses.go to auto parts store buy new throttle body hoses old ones will be hard to remove might have to cut two small hoses also buy new throttle body gasket also. before you can remove throttle body unit you have to remove accelerator cable and downshift cable from bracket bolted to throttle body.once throttle body remove then you can remove thermostat housing bolt remove replace thermostat.
Drain the coolant, undo the thermostat housing and remove the thermostat. Drop it into a pan of boiling water and watch closely. The thermostat should pop open. Take the pan off the boil and watch for about ten minutes, the 'stat should pop closed. If the 'stat does not respond then is is dead and new one is required, along with a gasket. Renew the coolant if rust colored. Top up thoroughly squeezing hoses to encourage air bubble removal.
It may be as simple as wiggle the hose & snug the clamp, or snug up bolts at housing.If that doesn't cure it, head over there first chance. Either way, I'd make it over there & let them know. Yes, they should feel responsible to correct the situation.