Hi:
If you follow the upper radiator hose back to the engine, it will end at the t-stat housing. Drain the coolant from the radiator, remove the upper hose from the housing, remove the housing, remove the t-stat, clean the old gasket off, replace the t-stat, gasket and reverse the sequence.
Let me know if you have trouble.
Joe
Jan 27, 2009 at 11:24 AM