I have A 08 GMC Sierra 6.0 1500. My heat only works when I am driving the truck. It blows cold air when the truck is in park no matter how long it idles. Any ideas on what could be the issue?

Asked by Nov 24, 2015 at 06:36 AM about the 2008 GMC Sierra 1500 SLE1 Crew Cab 4WD

Question type: Maintenance & Repair

I have even driven the truck to get the heat
warm and then put it back in Park in let it
idle and it cools back off

1 Answer

1,435

i think it is your thermostat

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,360
  • #2
    John Saffrahn
    Reputation
    3,700
  • #3
    Glenn Clingenpeel
    Reputation
    3,380
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,132 Great Deals out of 167,425 listings starting at $1,900
Used Ford F-150
2,323 Great Deals out of 184,535 listings starting at $699
Used GMC Sierra 2500HD
112 Great Deals out of 13,517 listings starting at $2,999
Used Toyota Tundra
468 Great Deals out of 32,492 listings starting at $1,999
Used Dodge Ram 1500
361 Great Deals out of 10,960 listings starting at $1,500
Used Chevrolet Silverado 2500HD
319 Great Deals out of 29,131 listings starting at $2,995
Used Toyota Tacoma
632 Great Deals out of 43,276 listings starting at $1,500
Used GMC Yukon
407 Great Deals out of 21,587 listings starting at $1,495
Used Chevrolet Tahoe
650 Great Deals out of 39,640 listings starting at $1,000
Used Ford F-250 Super Duty
368 Great Deals out of 44,898 listings starting at $1,799
Used Chevrolet Colorado
279 Great Deals out of 31,656 listings starting at $1,995
Used GMC Canyon
125 Great Deals out of 13,139 listings starting at $3,322
Used Nissan Titan
209 Great Deals out of 20,002 listings starting at $3,495

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
79 Great Deals out of 30,079 listings starting at $18,488
2016 GMC Sierra 1500 For Sale
110 Great Deals out of 3,816 listings starting at $15,681
2015 GMC Sierra 1500 For Sale
139 Great Deals out of 4,883 listings starting at $16,900
2014 GMC Sierra 1500 For Sale
144 Great Deals out of 4,930 listings starting at $14,204
2013 GMC Sierra 1500 For Sale
74 Great Deals out of 2,044 listings starting at $8,450

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.