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Why isn't my heat working in 99 GMC Sierra?

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Jeff

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Apr 7, 2009
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I already changed the thermostat. Both lines in and out of the heater core get hot. Can't seem to find anyone that can help me with any certainty. Could it be a vent door stuck in the dash?
Thanks for the answers. Just went out to play with the blend door actuator and check the fuses. The fuse for my AC was loose. I removed it and put it back in and bam, the heat works. I can't believe how simple and stupid of a fix this was. Lesson to self, always look for the simplest solution first!
 


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