If the thermostat in your 1999 Pontiac Grand Am SE stops working, you run the risk of the engine overheating and warping. The repair bill to have an engine machined can be several thousand dollars. When you notice the temperature gauge going higher than normal, it is time to change the thermostat. It is likely that engine buildup has accumulated around the thermostat and has caused a mechanical failure. It's better to spend a few dollars to replace the thermostat then to allow it to become a costlier job.
Things You'll Need
- 10-mm wrench
- Thermostat gasket
Locate the thermostat housing by following the top radiator hose from the radiator to the Pontiac's intake. The hose connects to the metal thermostat housing.
Remove the radiator hose from the thermostat housing. Loosen the band clamp that secures the hose to the thermostat housing by using a screwdriver to turn the screw on the clamp counterclockwise. Pull the hose off the housing.
Remove the bolts that secure the thermostat housing to the intake with a 10-mm wrench and pull up on the housing to remove it from the intake. Inspect the housing for any hairline cracks. If the housing is cracked, use a new one. Otherwise, use the old housing.
Pull the old thermostat out of the intake of the Grand Am by pulling up on it. Discard the old thermostat. Place the new thermostat into the intake and orientate it in the same manner as the old thermostat.
Remove the old paper thermostat gasket from the base of the intake and discard it. Place the new thermostat gasket onto the base of the intake and line up the bolt holes in the gasket with the bolt holes in the intake.
Place the thermostat housing onto the thermostat gasket and bolt the housing onto the housing using the original 10-mm bolts.
Push the hose back onto the housing and tighten the band clamp with a screwdriver.
Tips & Warnings
- The engine must be cool when starting this job. Radiator fluid is very hot when the engine is running and will burn skin.
- Photo Credit radiator humor image by John Sfondilias from Fotolia.com
Why Is My Grand Am Overheating?
Virtually nothing can destroy an automobile engine faster than overheating. When a Grand Am or any other vehicle overheats, there are several...
How to Change the Thermostat in a Pontiac Grand Am
The Pontiac Grand Am came on the scene in the 1970s, but it wasn't until the 1980s when it became the Pontiac...
How to Change the Thermostat in a Pontiac Grand Prix
Pontiac introduced the Grand Prix as a "personal luxury car," which means a big coupe with a big engine, a fancy interior...
How to Fill the Radiator on a V6 Grand Am
Filling the radiator in your V-6 Pontiac Grand Am can be a challenge. The reason it is so difficult centers around the...
How to Replace the Thermostat on a '95 Grand Am
The thermostat in a Pontiac Grand Am--indeed, in any car--is a little heat-sensitive valve that is responsible for letting the correct amount...
How do I Replace a Thermostat 2.2L?
GM uses the 2.2 liter modular engine in many of its automobiles such as the Sunfire, Cavalier, Alero and Grand Am. It's...
How to Fix a 1997 Pontiac Grand Am's Thermostat
If it seems as if your Pontiac Grand Am is always overheating, or at least running hot, the thermostat is the likely...
How to Change the Thermostat in a 1998 Pontiac Grand Am
The 1998 Pontiac Grand Am 2.4-liter engine's cooling systems use a thermostat to control coolant flow. Before the engine heats up to...