2000 gmc sierra. heater no blowing hot air

50

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

8 Answers

83,785

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

7 people found this helpful.
83,785

Three things...

2 people found this helpful.
50

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

1 people found this helpful.
83,785

That was in the summer.

2 people found this helpful.
50

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

3 people found this helpful.
50

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

83,785

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.

1 people found this helpful.

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 .

Your Answer:

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 61,254 nationwide Sierra 1500 listings starting at $1,395.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,600
  • #2
    John Saffrahn
    Reputation
    3,890
  • #3
    Glenn Clingenpeel
    Reputation
    3,720
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,788 Great Deals out of 154,391 listings starting at $1,000
Used Ford F-150
2,356 Great Deals out of 208,288 listings starting at $998
Used GMC Sierra 2500HD
145 Great Deals out of 17,680 listings starting at $2,995
Used Toyota Tundra
449 Great Deals out of 39,425 listings starting at $2,800
Used Chevrolet Silverado 2500HD
404 Great Deals out of 30,313 listings starting at $3,000
Used Dodge Ram 1500
326 Great Deals out of 9,355 listings starting at $1,995
Used Toyota Tacoma
422 Great Deals out of 48,089 listings starting at $2,994
Used Chevrolet Tahoe
547 Great Deals out of 38,191 listings starting at $1,243
Used GMC Yukon
328 Great Deals out of 21,474 listings starting at $2,450
Used Ford F-250 Super Duty
487 Great Deals out of 40,156 listings starting at $2,700
Used Chevrolet Camaro
233 Great Deals out of 27,354 listings starting at $2,077

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
27 Great Deals out of 35,229 listings starting at $20,490
2017 GMC Sierra 1500 For Sale
105 Great Deals out of 5,598 listings starting at $17,995
2016 GMC Sierra 1500 For Sale
52 Great Deals out of 2,714 listings starting at $16,700
2015 GMC Sierra 1500 For Sale
85 Great Deals out of 4,488 listings starting at $13,995
2014 GMC Sierra 1500 For Sale
63 Great Deals out of 2,831 listings starting at $11,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.