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Thermostat

Tiny
MEADEPEAK
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 108,000 MILES
The temperature on my car fluctuates every time I stop. I was wondering if it might be the thermostat, or is there some kind of sensor. Where is the thermostat located?
Friday, October 16th, 2009 AT 9:26 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,833 POSTS
Hello, you should start by draining the coolant. here is a guide for that:

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Here is a guide that will give you an idea of what you are in for when doing the job:

https://www.2carpros.com/articles/replace-thermostat

Here is what it will be lie on your car (below):

Tighten the water outlet housing bolts to 25 Nm (18 ft. lbs.)

Check out the diagrams (below).

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Thursday, April 18th, 2019 AT 2:35 PM (Merged)
Tiny
NMACH
  • MEMBER
  • 1 POST
  • 2003 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 49,500 MILES
What is the location of the thermostat on a 2003 Grand Prix?
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Thursday, April 18th, 2019 AT 2:35 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
If you have a 3.4 l engine it is located under the throttle body. Just follow the upper radiator hose to engine, the part it connects to is the thermostat housing. Hope this helps. Remember feedback and votes for me are greatly appreciated
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Thursday, April 18th, 2019 AT 2:35 PM (Merged)
Tiny
LOCUTUSBRG
  • MEMBER
  • 1 POST
  • 2001 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 149,000 MILES
I have a GTP supercharged. Where is the themostat located? It is in a different spot than in the normally aspirated v6
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Thursday, April 18th, 2019 AT 2:36 PM (Merged)
Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
Your thermostat is located right next to the throttle body towards the front of the car. You need to remove the injector cover to get to it.

You have two radiator hoses. One goes to the water pump, the other goes to the thermostat housing. Follow the hoses and you'll find your thermostat.
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Thursday, April 18th, 2019 AT 2:36 PM (Merged)
Tiny
SLINN104
  • MEMBER
  • 1 POST
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 98,500 MILES
Where is the thermostat located on the 2002 grand prix?
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Thursday, April 18th, 2019 AT 2:36 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
On GM V6 engines they are on intake manifold, follow upper hose to thermostat housing.
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Thursday, April 18th, 2019 AT 2:36 PM (Merged)
Tiny
WAYNE_O
  • MEMBER
  • 1 POST
  • PONTIAC GRAND PRIX
I have a 1996 Pontiac Grand Prix 3.1 litre. I recently replaced the water pump and now it is running hot. Could the thermostat be fouled up? If so what is the step by step procedure to replace it? Where exactly is it located?
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Thursday, April 18th, 2019 AT 2:36 PM (Merged)
Tiny
HEADHUNTER
  • MEMBER
  • 22 POSTS
I beleive if you follow the upper radiator hose from the rad to the engine the thermostat should be on the other end of that hose
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Thursday, April 18th, 2019 AT 2:36 PM (Merged)

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