AC fan continues to run after shut off and key removed

70

Asked by GuruSNF1Z Jun 04, 2019 at 10:29 PM about the 2005 GMC Yukon 1500 SLE

Question type: Maintenance & Repair

I have a 2005 GMC Yukon SLE with 227,000 miles on it.  Today after running the air conditioner for the first time since last fall, when I shut it off and took the key out, the AC fan kept running and wouldn't shut off.  I started the vehicle back up, tried to shut the fan off on the console, but it would not shut off.  Now the fan has continuously run for 5 hours and my 6-month-old battery is now dead.  My mechanic checked it out about a year ago for me as the speedometer and gas gauge quit working, and said that the motor for the cluster that controls all the gauges was on its last leg and there was several other malfunctions in the cluster as well.  I was told that it had no bearing on the AC and heat controls, and since I only drive it in my small home town, I decided not to have it fixed just yet since it was going to cost over $2500 to replace and repair what was wrong.  Could this be what is causing the problems with the fan?

5 Answers

42,920

Sounds like a stuck fan relay. Don't discard the battery. It's not "dead", just seriously discharged.

3 people found this helpful.
70

Do you think this would be an expensive fix, if that's what the problem is?

7 people found this helpful.
42,920

Go to the under the hood fuse block. Next to it is a smaller box containing the three cooling fan relays. Pull them out, one at a time, until that fan stops running. That's the one that is stuck "on". Take that stuck relay to the parts store and get the replacement. It should be under ten bucks. If that's not it, continue pulling relays until you find the culprit. There is also an "A/C controller unit" that may be bad. You will have to have a mechanic locate that for you. I don't have diagrams going back to 2005.

14 people found this helpful.
70

i had this same issue and had to change the blower motor the part was around 199. i bought it at the dealership where i bought my yukon. and replaced it myself just make sure you have all the tools.

7 people found this helpful.

Bcm not powering off??If not the blower motor resistor is probably faulty..

Your Answer:

Yukon

Looking for a Used Yukon in your area?

CarGurus has 935 nationwide Yukon listings starting at $6,900.

Postal Code:

CarGurus Experts

  • #1
    MikeDaGeek
    Reputation
    9,640
  • #2
    clayduster71
    Reputation
    5,170
  • #3
    David Boccabello
    Reputation
    4,000
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Tahoe
17 Great Deals out of 778 listings starting at $7,499
Used Cadillac Escalade
16 Great Deals out of 458 listings starting at $4,995
Used GMC Yukon XL
9 Great Deals out of 707 listings starting at $9,999
Used Chevrolet Suburban
7 Great Deals out of 534 listings starting at $4,999
Used GMC Sierra 1500
128 Great Deals out of 7,841 listings starting at $5,500
Used Ford Expedition
19 Great Deals out of 636 listings starting at $12,800
Used Chevrolet Silverado 1500
177 Great Deals out of 7,423 listings starting at $6,995
Used Ford F-150
301 Great Deals out of 13,535 listings starting at $3,888
Used Toyota Sequoia
5 Great Deals out of 58 listings starting at $19,990
Used Toyota 4Runner
26 Great Deals out of 536 listings starting at $14,791
Used Lincoln Navigator
8 Great Deals out of 292 listings starting at $16,990
Used Jeep Grand Cherokee
133 Great Deals out of 3,657 listings starting at $4,999
Used GMC Sierra 2500HD
34 Great Deals out of 2,128 listings starting at $8,490
Used Cadillac Escalade ESV
11 Great Deals out of 162 listings starting at $8,950

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.