pretty bad
Typical Repair Cost:
Average Mileage:
61,950 miles
Total Complaints:
42 complaints

Most common solutions:

  1. replace condenser (21 reports)
  2. not sure (7 reports)
  3. replace compressor (6 reports)
  4. replace entire AC unit (5 reports)
  5. replace A/C line to pump (2 reports)
  6. replace condenser, compressor, and flush evaporator (1 reports)
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This problem may be covered under warranty. Ask your GMC dealer.

problem #42

May 032021

Sierra 1500

  • Automatic transmission
  • 109,000 miles

Our A/C worked perfectly fine last summer (2020) and as it was getting warmer outside, we noticed the A/C was not working. We thought it would be a simple fix but come to find out there is a hole in the A/C condenser. This is a $900 fix.

- Haley H., Galion, US

problem #41

Sep 272019

Sierra 1500 XLT 4.3L

  • Automatic transmission
  • 55,250 miles

Truck is 4 years old, 55k miles... always dealership maintained... and driven by a little old lady (yes!). AC started blowing hot air. Looked online for a quick fix, only to find numerous postings about failed AC's in the 2015 GMC Sierra PU. I took it to the dealership and the entire system had to be replaced for $2550.00! Are you kidding me!!!! I called GM and all they offered was a $100.00 gift certificate! Can I use that $100 to purchase a new truck from someone other than GM?

- lostcustomer, Colorado Springs, US

problem #40

Dec 012021

Sierra 1500 SLT 4x4 6.2L

  • Automatic transmission
  • 88,500 miles

known GM issue on faulty welds on air conditioning compressor. In fact, they came out with a revised part because of it. Leak causes A/C unit to lose all refrigerant.

- Bob H., Highland Village, US

problem #39

Jun 102020

Sierra 1500 SLT 5.3L

  • Automatic transmission
  • 62,000 miles

My truck is only 5 years old and the AC stopped working. It's getting hot outside and the dealer wants to charge me 1800 to fix a common problem (condenser leak) and the part won't be available for 2 months.

- Felipe M., Laurel, MD, US

problem #38

Jan 162020

Sierra 1500 SLT 5.3L

  • Automatic transmission
  • 37,000 miles

Reached out to GM through chat and they gave me a case # based on the advice of several forums that gave me this advice with seemingly tons of people having same issue. Took to my local dealer and service tech stated as soon as I said AC not blowing cold, "I know exactly what is wrong and were it is." That aggravated me. They called me and told me 1200. I told them let me get with GM with my case # and see if they will doe anything. He said they could check.

They called me back said GM will not do anything, but the dealership will, and knocked it down to 828. Nice, I guess, but still pissed at AC going out with 37k miles and seems to be extremely common problem. Sent GM an email, no response yet. Found through google a law firm that appears to be setting up possible class action? I sent my Information to them. I want my money back!

GM f'd up. I have bought my last GM product and more so I am a purchaser for my company that currently has more than two dozen GM products and if up to me (and largely is) my company (God willing) will be done with GM products as well! I don't know if I can put this on here or not but the law office I reached out to was. https://www.consumerclasslawyersblog.com/bunch-hot-air-ac-gmc-chevy-trucks-simply-not-work/ I am not going to throw good money after bad, but if they can get me some or all money back without me having to pay them, I think it was worth the effort to fill out form.

- Drew W., Mobile, US

problem #37

Jul 162020

Sierra 1500 SLE V8

  • Automatic transmission
  • 76,252 miles

click to see larger images

A/C not working

This would be the third ac system in a car with 76,000 miles. Unit one went out at 48,000 and, luckily, I had an extended warranty. ($1800). Warranty ran out at 75,000 and, oh joy, they ac system failed again at 76,200. The dealership attempted to have GMC take responsibility for the $3000 repair but they only offered a 10% discount.

It seems, through research, this is an identified problem but no recall or solution. The system is replaced with same faulty compressor/condenser units. It also appears that there are two class action lawsuits filed against GMC for this issue. Dealership was awesome and worked with me on repair costs even though it wasn't their problem. I am still out about $2000.

- David S., Beaverton, OR, US

problem #36

Jul 132018

Sierra 1500 SLE V8

  • Automatic transmission
  • 48,915 miles

Repair was $1255.00 and, luckily, I had purchased an extended warranty with vehicle. I thought this was just a rare fluke until it happened again at 76,255 miles (only worse). That will be a separate complaint on this site. GMC is unwilling to assist, in a meaningful way, with the repair costs ($2500). Three a/c systems for 76000 miles? This appears to be a known flaw without any recalls.

- David S., Beaverton, OR, US

problem #35

Mar 202019

Sierra 1500 SLE 5.3L

  • Automatic transmission
  • 118,000 miles

Was down in Florida working. Hot days and no AC. Truck was out of warranty. Had to use an out of town repair shop who first said I had no freon and said it was possibly a bad condenser because the 2015 GMC Sierras were notorious for this issue. They said they had replaced 4 of them that week alone. They charged my system but within 3 days the AC stopped working again.

I went back and they replaced the condenser. Lost a lot of time with my vehicle out of state and trying to work. I called the local GMC dealership and asked if there were any recalls on this and was told it was not a real big problem and there were no recalls. Bad attitude by the dealer in his response. I have owned nothing but GM trucks my entire life. This was a disappointing experience and expensive repair.

- Harvey S., Ravenel, US

problem #34

May 012021

Sierra 1500 SLT

  • Automatic transmission
  • 70,000 miles

A/C just failed one day. Just started blowing hot air. Got the entire system replaced and now it still barely cools the truck down. This is just one of numerous issues with this truck.

- Brianna B., Leland, US

problem #33

Sep 162020

Sierra 1500 SLT 5.3L

  • Automatic transmission
  • 63,360 miles

Come On, Man!!! GMC should replace the leaking condenser with a good quality one that will last for absolutely NO CHARGE and reimburse the owners for money we spent on repairs and the aggravation it caused.


problem #32

Jun 152020

Sierra 1500 SLT 5.3L V8

  • Automatic transmission
  • 55,400 miles

Bought truck new in 2015. Victim of the vacuum pump but was refunded money by GM. This is not covered under the special warranty extended to their other vehicles with this same issue. The Sierra's are not covered for some reason. I'd be covered if Sierra's were included in there special warranty. Looks like others had the same issue. Either way condenser leaks, need it fixed and it cost 1260. Used dealer because all the local shops in California were similar priced. Very annoying but my truck is paid off. I look forward to the next random purchase with it.

- Michael F., Oceanside, US

problem #31

Jul 252019

Sierra 1500 5.3L

  • Automatic transmission
  • 76,000 miles

Had the truck 4 years and replaced the compressor 2 times. That makes 3 compressors in this 4 year old vehicle. Now I got to replace it AGAIN. 2 compressors in less than 3 weeks, no air at all. GM needs to stop with the cheap bullshit parts, its costing me time and money.


- Joka P., Mes, TX, US

problem #30

Jun 272019

Sierra 1500 SLE 5.3L

  • Automatic transmission
  • 50,000 miles

2015, 50k miles, A/C starts blowing warm air. I'm an HVAC tech, checked refrigerant charge with gauges, it's low. Some quick research reveals a known issue with condenser failures, top right corner, look for the oily spot. Dealer wouldn't do anything, will repair myself with aftermarket. Auto parts store stated they sell 3 replacement condensers every 2 weeks. My 2006 Envoy A/C compressor died at 65k miles. No more GM (government motors) vehicles for me. Gm is not going to step up to the plate on this one.

- Don Y., Edmond, US

problem #29

Jun 152019

Sierra 1500 5.3L V8

  • Automatic transmission
  • 48,645 miles

So air conditioning starts blowing hot air on an extremely hot day. Stinks of rubber, thought I blew a belt. No such luck, it just quit. Took it to the dealer they said I had no refrigerant in the A/C system and they would have to order in the parts. I tell them go ahead, cost around $1300.00 Canadian. This sucks. Where I live has hot summers and I bought this truck new, never mistreated it or anything other than towing an antique truck. So why on such a new vehicle is the A/C failing? Go online see I am not alone with this issue. As a long time GMC fan. I am disappointed with the lack of empathy GMC shows for this issue. It is obvious that this is not a one time thing, but a very common occurrence. If you want to class action suit in Canada I would be happy to recoup some of my losses.

- twoosterbc, Summerland, BC, Canada

problem #28

Jun 162019

Sierra 1500 LT 4.3L V6

  • Automatic transmission
  • 67,000 miles

I have owned numerous GM products in the past. This is the FIRST one I have ever had an AC problem with. GM knows they have an issue with numerous lawsuits out there but yet they sit on their asses because it don't matter to them as far as having a recall. This model and year has had numerous recalls already on faulty equipment ranging from the seat belt to the air bag sensor and the brakes. This is ridiculous and I demand some type of resolution.

Update from Jun 28, 2019: So repair shop technician told me for 15 years of doing ac work on automobiles he's never seen a compressor blow a hole out the bottom. It is square shaped and about an inch in length. Yea GM is gonna see this personally to give me my money back of 1100.00 to have their faulty sh*tty equipment fixed.

Update from Jul 8, 2019: So I got truck back after spending two weeks without it due to going through three compressors. Blew cold air for two hours then the damn thing stopped blowing air AGAIN. The clutch stopped working. SCREW YOU GM AND YOUR PRODUCTS!!!!!. This is fu#$ing RIDICULOUS!!!!

- Chris M., Columbia, SC, US

problem #27

May 052019

Sierra 1500 Denali 6.2L V8

  • Automatic transmission
  • 89,000 miles

Went out 18 months after I bought it 1/25/16.

I paid $1500 to fix, now blowing hot air as of 05/05/19.

- mtnherla6, Redlands, US

problem #26

May 012019

Sierra 1500 Denali 6.2L

  • Automatic transmission
  • 73,246 miles

Here comes summer and my GMC sierra's a/c starts blowing hot air. I search for a fix and find hundreds of other people with similar issues and two class action lawsuits.

Help! What can I do? I don't want to pay $1300 to fix it at the dealer!!

Any update on the lawsuits? Any help from dealers?

- Rich B., Cranford, US

problem #25

Apr 052019

Sierra 1500 SLT V8

  • Automatic transmission
  • 59,000 miles

After going to the dealer and having ac repaired, they gave me a number to call GM, 866-522-9559, to discuss the situation and see what GM would do to rectify the situation. I called GM and discussed the issue with a service team member. I was told it would be elevated to a Senior Service advisor for review and that Senior Advisor would call me within 2 business days to discuss my situation. Instead they had the Dealer call me the next day to tell me GM would not be doing anything concerning my situation. With all I have read regarding the ac problems on GM vehicles why is this not a recall situation?

- Rich H., Louisville, US

problem #24

Apr 032019

Sierra 1500 Slt All Terrain 5.3L

  • Automatic transmission
  • 63,512 miles

Have had this truck a little less than a year and the Air Conditioner started blowing hot air.

- Camaro S., Eureka, KS, US

problem #23

Apr 012019

Sierra 1500 LX 3.2L

  • Automatic transmission
  • 44,000 miles

Would have thought that this issue would have been covered under a recall or Warranty.

5th GM Pickup that I have owned. All had way over 100,000 miles and never had A/C Failure. Very disappointing.

- Dale Sue R., Franklinnklin, LA, US

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