2000 gmc sierra. heater no blowing hot air
Asked by sschwenke 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
11 Answers
Could be 2 things, one would be a bad temperature valve, a plugged heater core, or a blend door actuator.
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
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.
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.
I have a 2000 hmm siarra . Having a problem with it it is stuck on the defrost vent and only blowing hot air . I had the a/c checked out . They said it was fine working good ,and no leeks . They said my hvac control box was bad . I changed it but still the same thing ? What can it be .
Location of the heater control valve in the cab that controls the heater temperature in a 2000 GMC Sierrs single cab 2wd 4.3 vortec engine
I am having a problem with my 2013 GMC heater temp was set at 24 and I had alot of heat now I have to set it to max 28 to 31 to get it hot can you help me
Did anyone figure this out . I'm having the same problem I replaced the actuator. I replaced the climate Control Module and still no hot air and both hose are hot
