Question about GMC Sierra 1500

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1996 GMC 1500 4X4 TRUCK- NO HEAT

NEW THERMOS / GETTING HEAT IN RADIATOR LINE - FAN MOTOR IS WORKING - NO HEAT TO "IN" LINE TO CORE- NO SMELL- NO FOGGING NO WET FLOOR. hELP

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  • 670412cjcj Jan 20, 2009

    Thanx,

    Sorry should have said that...But I have done that already too and still nothing... any other ideas?

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I am going to assume that you checked to make sure the cooling system is full. The next thing to do is flush out the heater core. The easy way to do this is to clamp off the heater hoses with visegrips and remove them from the heater core. You will only loose the coolant that is in the core this way. Take a garden hose and try to backflush the core out until the water is clear. Being that you said you don't feel the inlet hose getting warm the chances are the core is completely blocked so it may take some working back and forth between inlet and outlet to dislodge anything in it. I have also had to use an air compressor to do it but you need to be very careful not to use too much pressure or you can rupture the heater core. Worst case is you will have to replace the core but I would try flushing it first. Hope this helps.

Posted on Jan 17, 2009

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