Question about 1998 Saturn SL

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Ok i have replace the coolant, termostate, radator, and lower and upper hose. the only thing left for me to try other than the head gasket would be to romove the thermosate completly. please someone help me ,it driving me crazy!!

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  • ZiggynSC09
    ZiggynSC09 May 26, 2010

    what is it doing and when?

  • Greg Stefan May 26, 2010

    What was the problem initially?

  • dioncolbourn May 26, 2010

    i use to be able to turn the ac on and stop the temp gauge from creeping up but now it doesn't matter the engine still seems to overheat plus the water starts to boil out of the small coolant tank.

    the engine runs like a charm so i dont think its the head.

  • dioncolbourn May 26, 2010

    ok i just removed the therstate and the engine still overheated.this just happened on monday while driving to work. i know i had a problem but using the ac and driving the car was good enough, but know even with the heat on and driving 80 mph the temp gauge continues to increase.



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Have a shop that offers a block check test done .they sniff the radiator with a fluid that changes color if combustion chamber gases are in cooling system . that way you will know if it is a head gasket or cracked head.

Posted on May 26, 2010

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DO NOT remove the thermostat completely! If there is no coolant in the oil or oil in the coolant your head gasket should be good for now. If the engine is overheating, monitor the fans while it is running to make sure they are engaging. Turn the a/c on and the temperature to hot. That should engage the auxiliary fan. The other fan should engage when the thermostat opens. Also, you may have air pockets in the system that need to be removed. once the car is warm, with a rag in your hand gently grab the upper radiator hose to feel for air bubbles. To remove them, wait until the engine cools and remove the radiator cap (which you should replace if you didn't when you put in the new radiator) top off the radiator and start the engine. Let it warm up with the a/c on hot to keep the fan running and when the thermostat opens, have someone bring rev and hold the engine at about 2000rpm while you top off the system and tighten the radiator cap, then let the engine back down to idle and road test the car. If coolant is being lost mysteriously, try removing one or more of the spark plugs to see if they smell like coolant (sweet, burned scent). Other than that, try to see if the water pump is leaking using a flashlight and a pocket mirror.

Posted on May 26, 2010


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