2000 gmc sierra. heater no blowing hot air

Asked by Dec 17, 2015 at 10:28 AM about the 2000 GMC Sierra 1500 SL 4WD Standard Cab LB

Question type: Maintenance & Repair

Have a 2000 gmc sierra. Heater not blowing out
hot air. Both input and output hoses hot. Can
switch temperature gauge and it will blow cooler
air . On hot it is just blowing lukewarm air . Putting
it on inside recylcling air does not make it any
hotter. Temp gauge is registering just below 210

7 Answers

37,965

Could be 2 things, one would be a bad temperature valve, a plugged heater core, or a blend door actuator.

1 out of 1 people think this is helpful.
37,965

Three things...

Thought about the blend door but in summer it will blow ac great and i switch it to hot settining and it will blow out hot air

37,965

That was in the summer.

Must be either the temp adjuster dial on dash or what it controls. . Stays on luke warm output whether on cold or hot setting

Ok renege last answer. Now it goes to cold setting when dialed but lukewarm on hot.

37,965

Both heater hoses getting hot so there is circulation threw the heater core. So one of the HVAC blend door actuators may not be functioning, and there is a heater valve call out for this vehicle, but not sure if it regulates heat. I will be gone for an hour or so now.

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