Question about 2004 Pontiac Grand Prix

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Engine light came...code says thermastat...engine runs cooler then normal...just change out thermastat??? Cap for last several months has been really hard to get off...I live in phx and its been really COLD the last few days I have a 2004 pontiac grand prix 3.8 l

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Yes, change out the thermostat. It's probably stuck all the way open because in Arizona it rarely gets cold enough for it to need to close down allowing the engine to warm up. It's easy to do. Try this link for instructions.

Posted on Dec 29, 2010



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Water is not flowin through engine and runs hot

circulation comes from the water pump,but the thermostat must also be opening and closing for this system to work properly.some where some thing is not functioning properly,with out a doubt in my mind and no your engine is not blown; make sure the cooling system is not air bound ,i do believe that there is several bleeders to render this problem ,now if the coolant light is on that usually means the reserve container is low but the level sensors also get stuck causing this type of situation,also the reserve bottle or container doesn't circulate,it just draws extra antifreeze when needed or when the engine over heats it catches back flow thats why it should be filled to the level indicated on the bottle ,good luck

Feb 28, 2012 | 2002 Chrysler 300M

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Engine light came on with a wrench showing.

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Jan 13, 2011 | 2003 Chevrolet Cavalier

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1998 Isuzu Rodeo Temp gauge is normal and then it went to hot and then back to normal. Did this several times. Checked and the engine was not overheating. Had the thermastat changed.The same thing is...

Try starting engine when cold and rad cap, and/or coolant return cap off, and turn heater on. Let engine run and add coolant as necessary to rad as /if level goes down, and allow engine to reach normal operating temperature, and wait for the rad fan to come on, 2 or 3 times. Give engine a slight rev for 5 seconds or so, every once in a while while doing this, just to increase flow and help expel air better. Keep an eye on coolant level while doing it, and add as necessary, then put cap(s) back on, fill bottle to proper level, and try that. If that doesn't work, I'd question if air hole in thermostat was positioned properly when new one was installed, if you have a V-6 engine.

Nov 08, 2010 | 1998 Isuzu Rodeo

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My 2002 oldsmobile intrigue was overheating so i bought a thermostat and waterpump and placed it in, now the needle will go way up to hot and then back down to middle again, and it will keep doing this,...

You have air in the cooling system. With the engine cold, remove the radiator cap (or overflow bottle cap if no radiator cap) and let the engine get to operating temp. Add coolant if it is low. There is no way to guess which of the 3000 codes your car has set without scanning it for codes.

Mar 04, 2010 | 2002 Oldsmobile Intrigue

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First make sure engine is cool.
-Put drain pan under car, coolant will run out.
-Remove the TOP radiator hose that runs to the metal thermastat housing. Coolant will now be running out, try and direct it to the drain pan below.
-Remove the thermastat housing, BEFORE removing the thermastat make sure you TAKE NOTE at how it is situated in the casting.
- Take the thermastat housing and run a wire brush on the flat spot were the old gasket material is.
-Both mating sides of the thermastat housing MUST BE PERFECTLY CLEAN. There can not be any old gasket material left.
-Insatll new thermastat.
-Put a very light amount of PERMATEX orange high temp. silicone on BOTH sides of the new gasket.
-Put a small amount on bolt threads also.
-Now install thermastat housing, and bolts.
-Tighten bolts down a little at a time, alternating between the two, unitl till they are tight.
-Install the radiator hose, and tighten hose clamp.
-Remove radiator cap, pour in coolant, until it sits just below the radiator cap neck. This may take a little time as the system has some air in it.
-Install the radiator cap. Make sure you radiator overflow tank is filled properly.
-Remove the drain pan, make SURE ALL the tools use used are secure, and out of the engine bay.
-Start engine, and place your heater control to 'HEAT"
-Let engine run until the top radiator hose is hot, which means you thermastat has opened.
-Keep watching the engine temp AT ALL TIMES, we wnat to make sure there is no air in the system.
-Inspect for any leaks. Now when the top radiator hose is hot make sure the hose clamp is tight.
Please let me know how it goes.

Feb 11, 2010 | 1993 Buick Skylark

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My engine light just came on. I bought blazer last month; drives really good except for light that just came on. what could this light mean?? a tune-up?

First quick check to do is make sure your fuel cap is tight. A loose fuel cap will set an EVAP code and turn the service engine light on.
Next, do you leave the engine on while you are refueling? If so, that can also trigger and EVAP code.
If the above is true, it will take "3" cold starts for the light to clear after the problem above was fixed.

If none of the above are true, take your vehicle to your local Auto Zone or Advance Auto and ask them to scan your vehicle for trouble codes, write the codes down and respond back. We can go from there.
Good luck,

Jul 20, 2009 | 1996 Chevrolet Blazer

1 Answer

1999 FORD ESCORT ZX2 radiator hoses swell and burst

you've got a serious overheating issue creating the pressure. Your temp gauge must be reading hot too.
If not, then you have engine compression pressure getting into the cooling system through a blown head gasket.
Replacing the cap will not help.

Mar 12, 2009 | 2001 Ford Escort ZX2

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