Heater blows cold and cant figure out why?

Asked by Luray Sep 10, 2020 at 10:52 AM about the 2001 GMC Yukon XL 1500 SLE 4WD

Question type: Maintenance & Repair

My 2001 GMC Yukon Xl heater only blows cold but
rear heater blows luke warm. Checked all fluids
and all full

1 Answer

295

it could be a plugged heater core. after you GMC gets to temp turn on your heater to high. you will have to hoses going into your firewall 1 is an inlet the other is your output. fell both of them if one is hot and the other is cool then you have a plug heater core

Your Answer:

CarGurus Experts

  • #1
    MikeDaGeek
    Reputation
    4,510
  • #2
    Rowefast
    Reputation
    850
  • #3
    Gene Arnett
    Reputation
    770
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Suburban
8 Great Deals out of 544 listings starting at $10,950
Used GMC Yukon
19 Great Deals out of 953 listings starting at $5,998
Used Chevrolet Tahoe
12 Great Deals out of 841 listings starting at $698
Used Ford Expedition
21 Great Deals out of 654 listings starting at $5,650
Used Cadillac Escalade
19 Great Deals out of 513 listings starting at $5,931
Used Lincoln Navigator
297 listings starting at $18,909
Used GMC Sierra 1500
154 Great Deals out of 8,348 listings starting at $5,975
Used Toyota Sequoia
3 Great Deals out of 49 listings starting at $14,999
Used Ford F-150
346 Great Deals out of 13,355 listings starting at $3,000
Used Chevrolet Silverado 1500
198 Great Deals out of 8,239 listings starting at $6,995
Used GMC Sierra 2500HD
43 Great Deals out of 2,198 listings starting at $8,490
Used Cadillac Escalade EXT
4 listings starting at $17,999
Used Chevrolet Silverado 2500HD
29 Great Deals out of 1,716 listings starting at $12,995
Used Dodge Durango
54 Great Deals out of 1,902 listings starting at $6,987

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. Content will be removed if CarGurus becomes aware that it violates our policies.