Question about Pontiac Grand Prix
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Posted on Jan 02, 2017
This is it I don't have a manual and noone else seems to either. I'm old school muscle cars from seventies. This electronic **** is too Greek for me. The fuses are all numbered but which one is it? I tried to google a fuse box diagram for a grand prix gt 2003 but got nowhere.
Posted on Sep 04, 2008
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.
Posted on Feb 27, 2010
hang engine, remove cradle from the car, and if youa re crafty, lower the trans end of the drivetrain enought to get the side cover off. BE SURE to replace the EPC solenoid as well. These wear out and hang up. They are next each other. One big (EPC) and the smaller below it (TCC/PWM)
Posted on Sep 02, 2010
If you need to know the correct part number just call the parts department at the G.M.dealership.They can look it up and give you the correct number.Just ask for the price and availability and have them give you the number for the part.Now you will know how much it cost and have the number.Hope this helps.Good luck.
Posted on Dec 05, 2010
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