Question about 1998 Chevrolet Cavalier

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Poor heat after head replacement

Customer stated that the vewhicle was overheating. We removed the head and had it tested and found it was warped. After re-installing the head with new head bolts and proper coolant bleeding sequence, it seems that while driving down the road at interstate speeds, the coolant temp drops to about 150 and stays there or lower. this is the same after replacing the thermostat twice too

Any help would be appreciated!!!!

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  • 2 more comments 
  • Rob Lanteigne Dec 02, 2008

    I replaced the head gasket and bolts with Fel Pro products, it has a 193 deg. thermostat, new water pump and belt, we have flushed the cooling system with Wynns flush machine and have been working on bleeding/burping the system for 2 days now to no success......

  • Rob Lanteigne Dec 03, 2008

    Ok, I spent all of yesterday afternoon bleeding and driving this thing. It may be "slightly" better, but there is still a problem there. I have raised the front of the car, raised the right side of the car, replaced the temp. sensor, driven and re-bled the system and am back to square one. I am not just a beginner at these things, but this one is kicking my ****!!!!!!!!

  • yadayada
    yadayada May 11, 2010

    Follow the procedure I outlined

  • yadayada
    yadayada May 11, 2010

    I still think there is air in the system, have you tried raising the car up in front as far as poss and then running it to let the air migrate to the top of radiator? Make sure the recovery tank is full before you do this, let the engine get hot but not overheated.

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I would go for the water pump, often people change the head gasket but remember,,, something usually makes this blow ie thermostat, dodgy water pump, blocked radiator ect,,,, but water pump would be my diagnostic

Posted on Dec 02, 2008

  • usersteve83 Dec 02, 2008

    Ok my next step would be bleeding the system,,, try this way leave the cap of fill the tank up to the brim and let it run to normal temp if possible raise the front of the car up for this(have the blowers on hot and fan on first setting for this), switch off the engine and leave to go ice cold again, then top up if needed,, other way would be to try and run the car with no thermostat,, not a permanant fix but if it acts different it would then narrow it down to a faulty thermostat or a blockage in the cooling system, finaly try the temp sender that could also be faulty

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