Question about 1993 GMC Sierra K1500

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I have a 1997 GMC 5.7 4x4 extendacab 3 door 1500. i am not getting heat. i changed the heater core and the thermostat. i checked the oil to see if i had antifreeze ana water in it but there is none in the oil cause i thought maybe i blew the head gasket. if u have suggestions and think u can help email me your suggestions.

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Look for a heater control valve along your heater hose that may have failed closed. Other possibility is clogged heater core.

Posted on Sep 16, 2010

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Have you checked for vacuum leaks? Some vehicles from that era used vacuum pressure to control heating/cooling baffles. If you have a bad vacuum leak, then the baffle will never swap over from vent/cooling to heating.

Posted on Sep 16, 2010

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  • mikeylike47 Sep 16, 2010

    where is it located? i get heat with the cap off and when i put the rad cap back on it looses heat. i also notice that after i drive or let it run when i take the rad cap off with the engine hot there is no pressure

  • qwindelzorf Sep 16, 2010

    The vacuum system, like the electrical system, runs all over the place. You can try to locate a vacuum leak by getting a can of starter fluid (the spray kind), and then spraying it LIGHTLY around under the hood with the engine running. If you find an area under the hood where a shot of starter fluid causes the engine to rev up, then there is a vacuum leak in that area.

    However, if you are getting heat when running the engine with the rad cap off (which is generally a bad idea, burns are no fun), that sounds like a coolant issue. Perhaps you have an air bubble somewhere in the system, such as at the heater core.

  • mikeylike47 Sep 20, 2010

    where r the heating baffles located?

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