Question about 1997 GMC Jimmy

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Heater wont work

My fan works and my heater core hasnt leaked, i changed my thermostat. and still there is no heat blowing out.

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  • Anonymous Jan 06, 2009

    I have changed the thermostat and the temperature is warm but will not get hot

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Is the thermostate coming from your intake any good its located were your upper radiator hose connects to your intake.under the water inlet housing. if its bad it wont close, if it doesnt close the water doesnt stay in the engine block long enough to heat up. if your a do it yourselfer remove the upper hose from your water inlet. now there should be two bolts holding down the water inlet they should either be 12mm or 1\2 inch remove these bolts. you will need a new gasket once removed or silicone. after removed you will see the thermostate. pop it out . it might be a little stuck, dont worry a little pressure it should just pop out. after you get it out check to see if open's by dropping it into a pot of boiling water for about 20 to 30 min.you should see were the two disks on the bottom come together,should be seperated(if good) if there not seperated you need a new one. just follow these steps in reverse to replace dont forget to clean were the inlet sits on manifold before applying new gasket. and definatly DO NOT OVER TIGHTEN BOLTS just a few turns crisscrossing until nice and snug

Posted on Dec 14, 2008

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1 Answer

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