Question about 1999 Pontiac Grand Prix

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THERMOSTAT REPLACEMENT WHERE IS THE THERMOSTAT LOCATED Is there a simple way to replace the lower radiator hose on a 1999 grand prix gtp

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You will need a 1/2" socket with ratchet, and a 1/2" wrench for the actual removal of the thermostat housing. First, remove the air duct from the air filter housing and the air intake connection to the engine. Set aside. Next, remove the upper radiator hose from where it connects to the engine by loosening the hose clamp. At the other end of this part where the hose was removed from is the "L" shape that houses the thermostat and bolts to the engine. This part (housing) has two bolts. The top bolt will require the use of an extension on your ratchet which you will need to insert between the water bypass pipe and the exhaust heat shield before coupling with the 1/2" socket. Loosen the top bolt. The bottom bolt will require the use of the 1/2" wrench, as the socket will not fit due to the location of the heat shield. NOTE: the bottom bolt only needs to be LOOSENED and not removed, as the housing has an open "C" at the lower bolt location allowing the housing to pivot upward from that bolt. After removing the top bolt and loosening the lower bolt, you can pivot the "pipe" end of the housing downward and carefully maneuver the housing out of its location. You should now see the thermostat. Clean surfaces of the engine and housing well. Insert the new thermostat with the "spring" into the engine and the "bell" outward. Be sure the seal is seated properly into its socket in the engine. Position the housing carefully, making sure not to move the thermostat out of position. Reassembly is the reverse of removal. In my case, I did not use any gasket seal. The thermostat has a rubber seal on it which works well on its own. Adding gasket seal may make removing the housing in the future more difficult

Posted on Jun 01, 2009

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How do you change the thermostat on a 1999 grand Prix gtp 3800?


The t-AT&T is located under the housing that is bolted to the intak manifold on the drivers side he the upper radiator hose is attached to. Remove the radiator hose from the housing. Remove the two bolts holding the housing to the intake manifold (a 10mm socket will work for this). Remove the housing. Remove the t-stat. Clean the mating surfaces of the t-stat housing and the intake manifold. Install the new thermostat. Install the housing. Reattach the hose to the housing. Top off the coolant in the radiator. Start the engine and let it idle until the cooling fans come on. Keep an eye on the coolant level in the radiator and top off as necessary. Once the fans come on replace the radiator cap and you should be good to go. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Jan 20, 2012 | 1999 Pontiac Grand Prix

1 Answer

How to replace a thermostat on a 1999 pontiac grand prix


  1. Disconnect the negative battery cable.
  2. Lower the coolant level a bit.
  3. Follow the top radiator hose to the thermostat housing.
  4. I would just leave the hose on for this thermostat and go right to removing the two mounting bolts.
  5. Pull the housing up and clean the gasket off bothe sides of the gasket real well. Becarefull not to gouge the aluminum.
  6. Install the thermostat with the little "tip" facing up.
  7. Now put the new gasket and a little sealer on it too.
  8. Reverse the previous steps to finish the installation.
  9. When you get the antifreeze full remember to burp the system with that little bleeder valve on top.
  • see diagram below for a visual.


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  • Hope this helps.

Nov 01, 2011 | 1999 Pontiac Grand Prix

1 Answer

1999 grand prix gt overheating. Changed thermostat, water pump, upper radiator hose. Please help!


does the upper and lower hoses seem to be the same temp when car begins to overheat? ore the radiator cooling fans coming on before the car overheats? did you pressure test the cooling system and radiator cap? also may want to remove the lower hose and flush the radiator. is the check engine light on and does it run bad?

Aug 03, 2011 | 1999 Pontiac Grand Prix

1 Answer

Replace thermostat on 2003 grand prix gtp with


The thermostat housing is located in the upper radiator hose. You will see a metal elbow secured by two bolts into what I remember is the upper intake manifold...don't quote me on that but you will see it regardless of whatever I call it. Anyways, GM decided it was a good idea to put stainless steel bolts in there but that makes it easy to strip the threads in the bolt hole so I think it's best when you put your wrench on the bolt to just tap on the handle till you vibrate it loose, then turn it.
When you pull off the housing you'll lose a little coolant and it will create an air pocket which we'll address. It's a 50/50 chance that the thermostat housing gasket will either stick to the housing or the engine...it may be torn, cracked or flaking in either case clean both contact surfaces before you replace the gasket. I recommend an oil impregnated poly material gasket.
Note the position of the thermostat in the hole and place the new one in as such.
I recommend a 180 degree thermostat...stock is 195 but the GTP runs better with the 180.
Put on gasket and reinstall the hose/housing assembly, alternate from one bolt to the other so the housing mates flat and cannot cause a leak.
Next, fill the coolant overflow bottle to the "HOT" mark. If the bottle is dirty and hard to see just put a light on top of the bottle...GM didn't mark it very well so if it's not squeaky clean you can hardly see a damn thing.
*IMPORTANT** if your car still has Dexcool in it, DUMP IT. It will eventually destroy the motor.
If not...continue on. Start the car. Go back to the thermostat housing and place a rag on top of, and twist the peacock valve on top of it to let the air out until it starts to get coolant on the rag. Done.

Jan 25, 2010 | 2003 Pontiac Grand Prix

2 Answers

2002 grand prix motor 3.8 just want to know where


Exploded view of the thermostat arrangement—3.8L engines

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Oct 31, 2009 | 2002 Pontiac Grand Prix

1 Answer

I have a 99 Pontiac grand prix and was wondering how to drain the radiator I can't find the drain ****


the drain fitting is usually on the bottom of the tank,near the lower radiator hose. it is acceptable to remove lower hose connection to drain.

Oct 13, 2009 | 1999 Pontiac Grand Prix

2 Answers

THERMOSTAT REPLACEMENT


Follow the top rad hose to the engine, where it connects that's the thermostat housing.

Jun 01, 2009 | 1999 Pontiac Grand Prix

3 Answers

THERMOSTAT REPLACEMENT


Follow the hoses leading from the radiator to the block -- upper hose first. Where the hose connects to the block there is a housing -- the thermostat is in that housing.

May 29, 2009 | 1999 Pontiac Grand Prix

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