Question about 1996 Chevrolet Blazer

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Thermostat was stuck. i replaced it. also flushed out coolant system because the previous owner had stop leak in it and that is what was sticking t stat. after doing all that. my heat is not heating when i drive. I thought the heater core was clogged so i flushed it out. The heater core hoses are warm.also the radiator and resivor are at full levels. im lost. its a 1996 chevrolet blazer 2wd with 4.6 vortec

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  • tbatey_22 Oct 24, 2010

    im assuming the t stat is working. when the temp gets up to around 190 its drops back down well below that?

  • tbatey_22 Oct 24, 2010

    would you know where for me to look for a vapor purge valve? i tried purging and burping the radiator but it appeared it was ok

  • tbatey_22 Oct 24, 2010

    even though i flushed out the heater core? i flushed it until it was clean water coming out

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Sounds like you might have a vapour lock between your engine and heater core.Is there a purge valve on this system to get rid of air? Also check the mechanism that adjusts the temperature on the dash I've seem them come apart.Good Luck

Posted on Oct 24, 2010

  • 67midget Oct 25, 2010

    Purge valves are located towards the top of the engine and to the back.Follow the hoses andif this engine has one it will appear to be almost like a plug with a fitting that loosens off.As a thought call your local dealership service department ,they can give you an exact location if this vehicle has one.Please don't think I'm being a **** but the thermostat did go in the right way? I'm just trying to cover all the possible things I've seen over the years!

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The stop leak powder has blocked up the heater core by the sound of it ,remove the hoses and and block one off the using a funnel and a piece of old hose mix some caustic soda solution and pour it into funnel and leave for a couple of hours then pull teh hose and the plug off and flush again then try it

Posted on Oct 24, 2010

  • tbatey_22 Oct 24, 2010

    even though i flushed out the heater core? i flushed it until it was clean water coming out

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If the heat works when you are sitting still and does not when you are driving the the thermostat is bad even though you replaced it. It may be clogged again, hopes this helps Tim

Posted on Oct 24, 2010

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