2018 Tahoe RST AC Stopped Working

[Rookie44]

Hey all,

This is my first post on this forum, and quite frankly didn't think that I would be posting on a forum about my 2018 for another few years. I am well versed in forums and use them for other rigs, boats and motorsports of all kinds. I searched this forum to find others who have had AC issues and see if I could run down the problem without posting. No luck... if someone can lead me to a thread that will address my exact issue? Please do and I apologize.

As stated, I have a 2018 Tahoe RST and the wife drives it every day with the kids. Two days ago, she told me that the AC stopped working. First, I checked the AC control fuse, and it was intact, next I looked for the AC Relay and found out that it is somewhere in the fuse block by the hatch door. I could not find any direction as to which relay exactly it is. I think it is the one marked 8430, but I need to confirm this. The AC clutch is not engaging under a call for cool. I cannot check pressures because I do not have the R1234yf adapters for my gauges. They are on order, however. I would just go out to NAPA and get a can with a gauge on it, but those are $140 for R1234yf!! I know that GM has had some condenser issues, but I checked mine and it appears to be the new one that shouldn't leak. I believe that I am out of extended warranty as well. I will be checking into that tomorrow.

Anyone have any troubleshooting suggestions or exact location of the AC relay for me? I will listen to any comment or suggestion that anyone has at this point.

Thanks!

~Rookie

 

[MobileHomie]

If it were me, I would take it to my friendly AC repair guy.

I am a dyi guy, but I don't see the point of buying that kind of equipment.
YMMV

 

[MikeK1981]

Hey all,

This is my first post on this forum, and quite frankly didn't think that I would be posting on a forum about my 2018 for another few years. I am well versed in forums and use them for other rigs, boats and motorsports of all kinds. I searched this forum to find others who have had AC issues and see if I could run down the problem without posting. No luck... if someone can lead me to a thread that will address my exact issue? Please do and I apologize.

As stated, I have a 2018 Tahoe RST and the wife drives it every day with the kids. Two days ago, she told me that the AC stopped working. First, I checked the AC control fuse, and it was intact, next I looked for the AC Relay and found out that it is somewhere in the fuse block by the hatch door. I could not find any direction as to which relay exactly it is. I think it is the one marked 8430, but I need to confirm this. The AC clutch is not engaging under a call for cool. I cannot check pressures because I do not have the R1234yf adapters for my gauges. They are on order, however. I would just go out to NAPA and get a can with a gauge on it, but those are $140 for R1234yf!! I know that GM has had some condenser issues, but I checked mine and it appears to be the new one that shouldn't leak. I believe that I am out of extended warranty as well. I will be checking into that tomorrow.

Anyone have any troubleshooting suggestions or exact location of the AC relay for me? I will listen to any comment or suggestion that anyone has at this point.

Thanks!

~Rookie

Just went through this with my '17. The extended warranty is good for 5 years or 60,000 miles. Mine was just past the mileage but fortunately I have a warranty that's covering it. Gotta pay $100 deductible since it's not the dealer I bought the truck from but I want GM to do the repair so that's fine. I'd just have a shop chase down and confirm the problem for first. Even if you want to do the work yourself.

 

[Rookie44]

Mike, you had an AC issue as well? What was the problem?

 

[MikeK1981]

Mike, you had an AC issue as well? What was the problem?

Sorry, I just now saw this. If you hit reply on the post before typing a response it will notify people that you responded to their post. Mine was the condenser issue. Fortunately I have a 3 year warranty from a third party that we bought with the truck. Got it back yesterday and apparently a pressure sensor somehow decided to fail too, so the radiator fans would run full throttle and get very loud, along with no cold air. Took it back today and replacing the sensor fixed it, at one point he referred to it as a cycling switch? Not sure exactly which part it was because of that, but it's fixed.