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Heater doesnt work - 2000 GMC Sierra

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Usually there is a hose that is approaximitly 3/4 inch to 1 inch in diameter that comes of inlet manifold , it conects to a round cylinder shaped part , this part has a cable and maybe a vacume hose on some models , replace this if it is not working freely have some one move heater knob in car to see if it opens and shuts , this may be blocked so remove and clean inside this part check when off that valve opens and shuts, also if your thermostat has been removed replace it as these are neccary to make your heater work .

if you need to replace heater valve (cylinder shaped part ) flush out the hoses that go into fire wall of your car , you may find blockage there also ,

i hope this is of some assistance

Posted on Oct 09, 2010

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