AC Not Working (<6k miles)

deminimis · August 29, 2019

'19 3500 L5P (black/black) Over 100 today and AC isn't working. My guess is the climate control computer got really hot and that caused it. Was in direct sun for about 3 hours. After leaving in shade at home, it's now working. Pretty lame. Anyone have this issue? Is there a fix? Hate to waste a day at the dealer just to be told is a-okay. (Compressor clutch wasn't engaging, by the way. Ice cold now that it's working again). Thanks.

mafd2 · August 29, 2019

I'm in hot humid Louisiana and must say my a/c works great and haven't had a problem all summer. 100° temps with 115° heat index and blows 38° out the vents. Hope your a/c isn't on the brink of going out like another members here did. The whole interior, dash, seats had to come out to change a leaking evaporator. Not a pretty sight...

mafd2 · August 29, 2019

Here's (from a member Bill) what an interior of a '19 looks like when changing an evaporator...

Edited August 29, 2019 by mafd2

deminimis · August 29, 2019

Ugggh.

mafd2 · August 29, 2019

6 minutes ago, deminimis said:

Ugggh.

Yep... I never followed up with him to see how the outcome was.

deminimis · August 29, 2019

I imagine it's a computer board that just can't handle the heat. Worked fine once I parked in the shade after a couple hours. Works fine this AM as well. My guess is they won't be able to diagnose the problem this season. Guess I better turn that appointment into an oil change as well so I don't completely waste my time.

deminimis · September 5, 2019

Took it in. Freon was low. No leak detected. Dye added in hopes of finding the leak. Still not sure that was the cause as it only failed on a 100 degree day, but perhaps. Unfortunately, no more 100 degrees this year. Got my heater plug cut off and an unexpected bonus :-(

mafd2 · September 5, 2019

If the evaporator has a tiny leak I don't think the dye will show due to it's location. I hope it's not the evaporator.

ejdziurka · September 5, 2019

1 hour ago, deminimis said:

Took it in. Freon was low. No leak detected. Dye added in hopes of finding the leak. Still not sure that was the cause as it only failed on a 100 degree day, but perhaps. Unfortunately, no more 100 degrees this year. Got my heater plug cut off and an unexpected bonus :-(

Mine goes in for the second time next week for weak AC on the drivers side. Last time it was 0.2kg low on Freon. Worked fine for a month, now it's failing again. I suspect there's a leak even though they pressure tested it. They said they should have put dye in last time, so hopefully they can see the leak this time. If not it'll be a recharge and dye, and wait for it to fail again.

BIGDOGx · September 6, 2019

20 hours ago, deminimis said:

Took it in. Freon was low. No leak detected. Dye added in hopes of finding the leak. Still not sure that was the cause as it only failed on a 100 degree day, but perhaps. Unfortunately, no more 100 degrees this year. Got my heater plug cut off and an unexpected bonus :-(

It's not the sun overheating anything, its cheap rubbish made parts. Go look at the 14-18 forums to see what great pieces of crap gm a/c parts consist of these days. Mine lasted 3 1/2 years at least, and 32k before it decided to leak from oh the lines, the evap, the condenser, only original piece left now is the compressor and i heard those are not much better. Looks like they are using the same low quality components that are guaranteed to fail at some point.

Edited September 6, 2019 by BIGDOGx

Tony Ankar · June 8, 2020

2020 GMC Sierra 1500

Sounds like I have the same issue as some of you. Driver side air conditioning is not cold. Took it in with 1200 miles - refrigerant was low. Service re-charged refrigerant and put in green dye. Same issue came back 3 weeks later. Refrigerant was 50%. Clearly a leak but they cannot detect the leak. They are saying they may have to replace/repair the evaporator (which is a pretty invasive fix). Possibly the condenser.

Has anyone had this issue resolved? What was the solution in your case?

evangmlw · June 15, 2020

I'm having the same issue now on my 2019 Silverado. Air cold on passenger side, hot on drivers side with temps set at same level. Will be taking it in this week to check it out.

Pinnacle · June 15, 2020

On 8/28/2019 at 9:46 PM, mafd2 said:

Here's (from a member Bill) what an interior of a '19 looks like when changing an evaporator...

It never goes back the way it was always something after that seen alot of that at the dealerships

Pinnacle · June 15, 2020

On 9/6/2019 at 8:55 AM, BIGDOGx said:

It's not the sun overheating anything, its cheap rubbish made parts. Go look at the 14-18 forums to see what great pieces of crap gm a/c parts consist of these days. Mine lasted 3 1/2 years at least, and 32k before it decided to leak from oh the lines, the evap, the condenser, only original piece left now is the compressor and i heard those are not much better. Looks like they are using the same low quality components that are guaranteed to fail at some point.

yes sir just as bad if not worse here the amount of plastic is insane

ejdziurka · July 7, 2020

I will now be on my 5th attempt at fixing it later today. Anyone ever get a resolution on the drivers side no AC? I've had 3 recharges, and 1 damper accuator replacement. No luck still, and no sign of the dye from the leak. I have a feeling my truck will soon look like truck pictured above.