Mechanics

CAR OVERHEATING

2002 Pontiac Grand Am

Engine Cooling problem
2002 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic 125000 miles

My husbands car has been down now for 3 weeks. He had the intake gasket replaced, it still was over heating. He's replaced the thermostat for a second time, had the radiator flushed, by passed the heater cor thinking it could be pluged, fans work correct, run super radiator flush into the system, took apart water tank fins are still intack, the guy that did the intake said it looked good as cracked head or gaskets. The exhaust works so its not a pluged catalytic converter. We are at a dead end on whats causing it to over heat still. Any ideas because I am about to just give it back to the bank, owes to much for amount of miles no one will take it for trade.
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Adavis832001
June 18, 2008.




I noticed that you stated that you havnt checked the water pump yet?

Run the vehicle and when the top hose gets hot then the thermostat is open.

With a pair of gloves on pinch the hose shut then release you should feel water pressure build and then when you release rush past you.

Blackop555
Jun 18, 2008.
We checked the water pump too, had to buy new gasket to put it back together.
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Tiny
Adavis832001
Jun 18, 2008.
I was hopping that it was just hte pump.

But since sounds like everything is checked I would suspect the engine is running lean or the ignition timing is off causing the engine to run too hot. Have the radiator fins cleaned out, you can use a air nozzle and spray it out get all the bugs and dust out.

Blackop555
Jun 19, 2008.
Ok he also would like to know what is causing the water tank to drain empty then when car is turned off the water returns back into the tank. Mean while causeing the low coolant light to come on when it isnt really low.

Tiny
Adavis832001
Jun 19, 2008.
The water is being sucked down from the resevoir to the radiator because when it is hot the fluid expands and when the engine is turned off, the pressure goes down and it causes it to return to the tank, but when its running it sucks it out into the system.

Try filling it with the vehicle running see if it will fill up then.

Blackop555
Jun 19, 2008.
I am having the same problem with my car. It fills up but when I shut my car off all the coolant and water leave the reservoir through the overflow hose. Its also saying that my coolant is low when it is full and also my engine temp keeps fluctuating, Any help?

Tiny
Heathertenneson
Nov 27, 2012.

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