Question about 1999 Pontiac Grand Am GT

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Keep overheating, radiator and thermastat had been replaced on my 2000 grand am

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  • jeff hillird
    jeff hillird May 11, 2010

    is the fan coming on , the eletric fan should come on when you turn on the a/c switch check it

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  • Pontiac Master
  • 3,854 Answers

You water pump could be weak and needs to be replaced. Start up the car with the radiator cap off, make sure the radiator is cool first before removing the cap. Start the engine and let it warm up to operating temperature and look at the radiator and see if the antifreeze is flowing through, if it's not flowing through at a good rate then it's time for a new water pump. Before you turn the engine off place the radiator cap on first, if you turn the engine off first before the radiator cap is on. It going to back flow and antifreeze will come out like a old faithful. The other thing to make sure your have 50/50 mix of water and antifreeze, 100% antifreeze will not exchange heat fast enough. Water is great for heat exchange but has a lower boiling point then antifreeze, that's why the antifreeze is mixed in with the water. Good luck and hope this helps.

Posted on Jun 15, 2009

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  • Contributor
  • 29 Answers

What about the water pump?

Posted on Jun 15, 2009

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3 Answers

I have a 1999 Pontiac Grand Am GT that keeps Overheating. I've changed the Water pump, Radiator, Rehotwired the fans to alway come on right when I start the car and only go off when I kill it. It


With a over heating problem the first place you always check is the thermastat.Thermastats ALWAYS go.
In fact every two years I change the thermastat wether or not it needs it just to be safe than sorry,I live in a snow belt and nothing worst than having no heat in the winter.
Something else you might keep in mind, over heating can do allot of damage most people don't consider, the transmission lines are connected to the radiator which cool the transmission

Feb 19, 2013 | 1999 Pontiac Grand Am GT

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MY 2004 PONTIAC GRAND PRIX GT IS OVERHEATING I FLUSHED IT NEW COOLENT AND NEW THERMASTAT AND IS STILL OVERHEATING WHAT SHOULD I DO?


Run water over the radiator while it is still running and see if the temprature goes down. Likely your radiator is stuffed up. A rod out done by a radiator shop will save a lot of money.

Jun 04, 2011 | 2004 Pontiac Grand Prix

2 Answers

1999 grand am is overheating


Beats itself?? I really dont know what that means. the cooling fan should come on when the a/c is on. when the engine is hot, the radiator should be hot. turn the a/c on and feel the air coming through, it should be HOT, if not, there is a coolant flow problem.

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The car keep overheating, there is water in the radiator and the resevior tank 2000 jeep grand cherokee i check the oil their is no water found in the oil the water from both unit stays full


Sounds like your thermostat is stuck closed. Shouldn't be more than a $20 part from autozone and is simple to replace. Follow your top radiator hose to the motor and it will connect to your thermostat housing. Disconnect the hose (antifreeze will run out) unbolt the housing, and replace the old thermostat. Refill radiator and bleed the system.

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Radiator is overheating chaned thermastat still


water pump is the problem,you will find the the water pump impellor has broken or come loose from the shaft,you going to have to replace the water pump

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My Jeep overheats while sitting idle. When I drive, the gauge goes down quickly. I have had thermostat and fan changed. I have also had the radiator flushed. What can it be?


we have a 2003 and it did the very same thing . Its called cooling fan relay it costs about 60.00 and is located behind the headlight assembly . not very hard to fix if you know anything about cars .

May 01, 2009 | 2004 Jeep Grand Cherokee

1 Answer

Overheating


Hi,

Based on your description "hard line from thermastat area has a heat wraparound it goes towards firewall", that would appear to be part of the heater system for the inside of the vehicle and would not affect the overheating of the engine.

Most engine overheating could be caused by:
  • insufficient coolant in the radiator or reservoir;
  • defective (stuck) thermostat;
  • too soft radiator hoses (upper/lower);
  • water pump, belt, tensioner;
  • clogged radiator;
  • radiator fan motor, clutch (if has got one), relay.
Additionally, in a large number of vehicles, the radiator fan motor would only work the A/C or heater is ON.

Corrective action would require determining which is the culprit, pls try:
  • remove the thermostat completely out and test drive, see if the overheating comes back, if yes, then it is not the thermostat, if no then the thermostat most likely is stuck closed and would need replacement;
  • on start from a cold engine, remove the radiator cap and pls check if the water flows when the engine is revved. If yes, water pump is working, if not, water pump is defective;
  • in a closed loop cooling system such as in your car, there is a possibility that the radiator hoses might have thinned down or gotten softer. This could be checked by revving the engine while looking over the hoses, there should be apparent sagging or reduction in diameter when the engine is revved. If any, then they are too soft and would need replacement;
  • clogged radiators could be flushed/cleaned by removing the drain plug at the bottom.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 08, 2008 | 2000 Chevrolet Silverado 1500

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