Where is the thermostate on a 1998 jimmy?

On a 1998 GMC Jimmy, the thermostat is located in the engine compartment, typically near the engine block where the upper radiator hose connects to the engine. To access it, you'll need to remove the upper radiator hose and the thermostat housing, which is usually secured with bolts. Once removed, you can replace the thermostat as needed. Always ensure the engine is cool before attempting to service the thermostat.