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First issue with our 2015 Yukon


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We experienced our first problem with our 2015 Yukon. As the days here in Texas began to warm up I noticed a couple of times when we'd go out in the afternoon and hop in the Yukon that the A/C didn't seem to be working. We'd drive a 1/2 a mile and it would feel like it started to cool and then start blowing hot air. After another 1/4 of a mile or so it would start cooling. At the time the outside air temps were between 95 and 100 and I attributed it to it just taking a while for the compressor and freon to do its thing and didn't give much thought to it.

 

This last weekend around 4:30 on Saturday afternoon we hopped in the Yukon and was headed out to do some errands and once again the A/C didn't seem to cool. Temps were over the 100 mark and I once again figured it was just needing a bit longer to catch up with the hot air in the cabin. After driving a couple of miles I realized it was obvious that something wasn't right. We pulled over into a parking lot, turned the engine off for 30 and restarted it and got back on the road. My thought was maybe it just needed a reset (yeah I know, wishful thinking). From there we drove about 10 miles or so with the windows down on the highway. As we pulled off at our exit I could feel cooler air begin to come out for about 10 seconds but it then went back to blowing what I'd call pretty darn hot air. Once during the 10 miles on the highway I turned the A/C completely off for a couple of mile and turned it on again only to have it cool for a couple of seconds and then back to blowing hot air.

 

Once we reached our destination I popped the hood to see if the compressor was engaged and as i suspected it was not. We let it set for about 30 minutes while we ran our errands and hopped back in for the ride home. Once again, no A/C. Cycled the system a couple of times and nothing. Later that evening when things were cooled down I went out and started it and right off the bat, nice cold air. At this point I was beginning to come up with a theory that there had to be some sensor preventing the compressor from engaging. To test this I decided to garage the Yukon and on Sunday I would start it up about the same time in the afternoon. Outside air temps again above 100 but cooler in the shade of the garage and sure enough A/C worked like a champ.

 

So, Monday morning my wife took it to the Chevrolet dealer who had been doing the oil changes on my 2014 Sierra and prior to that my 2010 Sierra warranty work only to find out that GM no longer lets Chevrolet dealers work on GMC's and vice versa. Just for the record for GM if they read this, I get your reasoning but think its a total crock. In any event we made an appointment with the dealer we purchased both the Yukon and the Sierra from to have the oil changed, recalls done and the A/C looked at.

 

Earlier today the service adviser called my wife to say that the oil had been changed and they did one of the recalls but had to order parts for the other. As luck would find it the temps this week cooled off and the service manager said they could not replicate the problem with the A/C which I understood but was a bit put off by the comment on the work sheet that read "No problem found at this time. It will take longer for air exchange in vehicle and cooling time will take longer on hot sunny days." Well NO KIDDING?

 

Now for the venting. My wife is the one who took the vehicle in and I'll admit that I should probably have done it myself. None the less she did explain to them all the troubleshooting I had done and that it only happens when the temps were above teh 100 degree mark. She also explained to them that it does not happen to her when the truck sits in her office parking garage and that I had confirmed that the comressor was not engaging when it was acting up. I am sick and tired of of the types of answers and condescending comments from techs and service advisers as seen above. Years ago I had to dress a service adviser down that had the same attitude stating to him "Sir, just because I happen to have on a tie when I drop off and pick up my vehicle does in no way mean that I do not know how they work or when they are not working right". Needless to say the comment above ticked me off when I read my wife handed me the work sheet.

 

In any case, we're are scheduled to take it back in in a few days when the parts come in for the recall and I will take it in this time and make sure they understand the symptoms. Thanks for letting me vent and I'll keep y'all updated as things progress.

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Thanks for the advice Won. One would think though that driving 25 miles and the compressor not coming on with the OAT being over 100 would not be a GM design to save gas. I should also add that when the OAT is 95 and below it works like a charm. There has to be some sensor somewhere that's faulty or not calibrated right in my opinion.

 

 

Sent from my iPhone using Tapatalk

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Sounds like it might have a leak and be low on freon, but Im sure the dealer checked for that. Still might recommend it to them just in case, a compressor will cycle when low on freon.

 

Makes me love my Tahoe more. The AC on it is awesome. Downsizing the AC on a bigger vehicle....sigh. People don't buy these things to get 40 MPG.

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Hello robsieb,

 

I am sorry to learn that you've experienced concerns with the A/C in your 2015 GMC Yukon. I see that you have taken it into the dealership and they were unable to diagnose your concern and that you'll be taking it in again soon. If there's any assistance we can offer with regard to documenting this concern or giving your dealership a call, we are happy to help. If this interests you, please send us a private message with your full contact information, VIN, current mileage and dealership name.

 

All the best,

 

Andraya

GM Customer Care

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That sounds like my Ford work truck when it gets above about 90 here and you get in it and fire it up it does not make any difference if you have it on low or max it will blow hot air for about 10 minutes before it starts to cool. But once it starts it will get that single cab good and cold. I hope you can get your problem taken care of.

:jester:

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Something else to consider that I have noticed in my 2014 Sierra. If you drive it normally (RPMs below 3500-4k), the AC works great. If and when you need to get on the loud pedal (merging, whatever) and come close to redline, the AC Compressor disengages while in that zone and will take a few seconds or so to kick back in and cool the cabin down. Not saying you are driving like a NASCAR driver, but maybe the sensor that checks for that certain RPM range is faulty and only temps bring it to light?

 

Shot in the dark, but worth an ask.

 

SteveCZ

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Thanks everyone for your input. This is obviously not your normal a/c problem. When it works it works great. Just seems to NOT work when it's needed most (temps above 100). The dealer put gauges on it and all was correct. When it works the compressor works just as it should. Just seems something is preventing it from engaging when the OAT is that high.

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  • 3 weeks later...

Took the Yukon back to the dealer Thursday morning for them to finish the recall work and take another look at the a/c. Once again the temps Thursday were low enough they could not replicate the problem which has been on going and growing worse since we first took it in. The decided to keep it another over night and try again today. We got a call from them this afternoon saying it was warm enough for them to experience the problem and it looked like a bad expansion valve which they replaced. When my wife picked it up this evening the temps were around 103 and the a/c worked flawlessly. Fingers crossed that we have if fixed.

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