Question about 2003 Pontiac Grand Prix

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My car keeps running hot. Don't know why. I put coolant in the car and it still does the same thing.

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  • Contributor
  • 33 Answers

Possible stuck thermostat

Posted on Aug 26, 2010

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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dennymulford
  • 1055 Answers

SOURCE: Car keeps running hot, I believe the coolant

prob the waterpump leaking, and make sure your fans are working

Posted on Aug 14, 2009

wracefans24
  • 1985 Answers

SOURCE: cars losing coolant pressure not losing coolant running very hot!

you need to verify and fill the coolant in the radiator and reserve when the engine is cold,also check to make sure your cooling fans are kicking on when it is hot

Posted on Dec 25, 2009

roniecon
  • 6826 Answers

SOURCE: My 2002 Oldsmobile Silhoutte's coolant gage running hot

Change the thermostat,and bleed the air out of the system,and make sure the cooling fans are coming on,and then going off,on there own,with the ac off,if this was helpful,please rate,thank you.

Posted on Jul 05, 2010

jim4984
  • 797 Answers

SOURCE: The Coolant level light keeps

You have a leak some where. I would have this professionally checked if you can not find it. The reason I say this is I had a car doing the same thing (it was borrowed and I do not remember the exact model) and one day, the engine completely drained and destroyed the engine.

What happened is the freeze plugs on this engine were supposed to be changed every 60000 and it had over 100000 and had never been changed. One or more was leaking and then completely failed (popped out). I am not saying this is what is going to happen to you just a cautionary tale.

Looking yourself, see if you can find a leak. The most obvious places to start are with the radiator hoses, heater hoses, radiator and heater core, water pump. If it is none of these, it could be a leak in the cylinder head or somewhere else. Both of the latter are big jobs and requires much skill and knowledge to resolve.

Good luck, Jim

Posted on Feb 23, 2011

  • 12 Answers

SOURCE: My car is getting hot

did you ever put coolant back in the system?? water is only a temporary solution to get to a shop or home......you say no leaks?? then why was the coolant low in the first place?? how old is the car and how many miles on the car..GM lower intake manifolds are know for leaking .. also possable head gaskets are blown and coolant is leaking internal and burning away.. are the cooling fans coming on?? they should turn on as soon as you turn on your a/c ..if your a/c is broken youll have to let the vehicle run to operating temp and see if they come on ..definatly need more info to help with diag.

Posted on Jul 28, 2011

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This could result from a thermostat which is stuck closed, or a failed coolant temp sensor not allowing the radiator fans to run when they should, but I think you have a blown head gasket. Overheating is a classic sign of combustion gases getting into the coolant. The pressure also forces it out of the overflow.


Warm up your engine a little, about half, and remove the radiator cap by putting a towel over it first. Then let the engine keep idling until hot while you look down the filler neck into the radiator......carefully.

If you see white bubbles like dry ice, that is a failed head gasket. If not, have a mechanic do a test for combustion gas in the coolant with a gadget like this

http://www.youtube.com/watch?v=1_SIwHMLmkM

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did you ever put coolant back in the system?? water is only a temporary solution to get to a shop or home......you say no leaks?? then why was the coolant low in the first place?? how old is the car and how many miles on the car..GM lower intake manifolds are know for leaking .. also possable head gaskets are blown and coolant is leaking internal and burning away.. are the cooling fans coming on?? they should turn on as soon as you turn on your a/c ..if your a/c is broken youll have to let the vehicle run to operating temp and see if they come on ..definatly need more info to help with diag.

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Just need to know where to put the coolant


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Water pump problem?


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