2000 gmc sierra. heater no blowing hot air

40

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

77,745

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

7 of 7 people found this helpful.
77,745

Three things...

2 of 2 people found this helpful.
40

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 of 1 people found this helpful.
77,745

That was in the summer.

2 of 2 people found this helpful.
40

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

2 of 2 people found this helpful.
40

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

77,745

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 of 1 people found this helpful.

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 62,852 nationwide Sierra 1500 listings starting at $1,500.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,500
  • #2
    John Saffrahn
    Reputation
    3,780
  • #3
    Glenn Clingenpeel
    Reputation
    3,500
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,863 Great Deals out of 162,455 listings starting at $1,500
Used Ford F-150
3,156 Great Deals out of 223,259 listings starting at $1,000
Used GMC Sierra 2500HD
104 Great Deals out of 13,567 listings starting at $1,950
Used Chevrolet Silverado 2500HD
420 Great Deals out of 29,429 listings starting at $2,000
Used Toyota Tundra
662 Great Deals out of 34,094 listings starting at $1,500
Used Ford F-250 Super Duty
463 Great Deals out of 46,622 listings starting at $595
Used Chevrolet Tahoe
837 Great Deals out of 39,675 listings starting at $1,990
Used Toyota Tacoma
656 Great Deals out of 41,081 listings starting at $2,500
Used Dodge Ram 1500
375 Great Deals out of 11,005 listings starting at $1,800
Used GMC Yukon
549 Great Deals out of 18,609 listings starting at $1,950
Used Chevrolet Camaro
494 Great Deals out of 30,881 listings starting at $995
Used Jeep Grand Cherokee
1,061 Great Deals out of 66,871 listings starting at $950

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
28,492 listings starting at $23,886
2017 GMC Sierra 1500 For Sale
92 Great Deals out of 6,830 listings starting at $19,999
2016 GMC Sierra 1500 For Sale
144 Great Deals out of 3,867 listings starting at $15,500
2015 GMC Sierra 1500 For Sale
191 Great Deals out of 5,818 listings starting at $14,995
2014 GMC Sierra 1500 For Sale
233 Great Deals out of 4,816 listings starting at $8,495

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.