How do you change a 1998 Pontiac firebird thermostat?

Answer 1

Depending on how big of a mess you want---otherwise you need to drain the coolant--easiest way is to pull the lower radiator hose off and then reinstall.

You need to do is remove the 2 bolts where the egr tube goes over the upper radiator hose/t-stat housing--you may want to get 2 new gaskets for the egr tube--sometimes they are ok and sometimes they are not. Remove the 2 bolts that attach the upper t-stat housing to the intake. NOTE: pay attention--bolts are different length--remove old t-stat and gasket, clean surface with small puty knife/razor blade and replace with new. Side note!!!! I like using factory t-stats in case they have small vent holes etc but that is your choice.

Refilling and bleedinig system of air

Refill radiator with 50/50 mix of GM approved coolant and distilled water if possible--refill and loosen bleeded screw on top of t-stat housing---fill till coolant comes out bleeder.. start car and let run for a minute or 2 and then recheck coolant level. Be careful coolant might have pressure when you take off the rad. cap to recheck level. Check for leaks and then let car run to ensure there is not an air pocket if there is you will know the car will start to overheat----if it does start to over heat shut car off and let cool then redo engine fill procedure.

NOTE THIS IS FOR THE 3.8L V-6 ENGINE.