The thermostat on a 1992 LeSabre should be inside of the top radiator hose inlet. You can easily change it by removing the top hose and water inlet.
Drain the radiator and dispose of the coolant as it is toxic to animals. Remove the top radiator hose. Remove the water inlet. Pull the thermostat from under the inlet, and replace. Reverse the procedure to finish the instillation.
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Your thermostat needs to be changed. It's about $10.00 for the part and simple to change. It's probably where the top radiator hose meets the enging block. Don't forget to boy Permatex gasket sealer and use it when you change the thermostat.
5 quarts with a filter change. 4 quarts without filter change.
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