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The thermostat on a 1998 Grand Prix can be located by following the radiator hose (at top on the driver side) to the engine. The housing that the hose is clamped to has the thermostat in it. Just remove the housing (two bolts) and you will see the thermostat. Its a tight spot but if you remove the air filter and remove it from the throttle also, then you can access the thermostat housing. Removing the bolts from the thermostat housing can only be done in small increments(short turns). I think its a 10mm wrench or 13mm can't remember but its metric somewhere in that range and only a wrench will work. Its impossible to get a socket wrench in there. Have patience and keep turning. CAUTION CAUTION! (Also make note to how the thermostat sits in the housing, because if you sit the thermostat in the housing wrong you will not be able to put the housing back in position. It will be confusing if the thermostat is in wrong. It just won't fit back in place like that.)
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