Electrical/AC issues

[Eric Sanchez]

I own a 2020 Silverado LT With 38k miles. 
Has anyone seen issues where their AC periodically stops blowing cold air. Then I get the cluster reading service steering column, my gauges start fluttering and I lose my head lights. 
 

1st visit to dealership new battery and new AC compressor 

2nd due to same issue they couldn’t duplicate the problem

3rd no codes or errors were being picked up. Total of two months in and out of the dealership. 
 

I have video of when This happens. It is periodically. Some days it will PD 10 times others non. Took it to a local prominent AC repair shop he said it has to be electrical and he would t want to mess with it.  I am stumped And frustrated. I don’t know what do anymore.  

Edited May 7, 2023 by Eric Sanchez

[SPASierra]

Has the dealer checked all of the grounds?  There was a TSB for the under hood fuse block not being torqued down, but I would think you would have had issues all along if that was the culprit.

[GMCustomerService]

On 5/7/2023 at 12:29 PM, Eric Sanchez said:

I own a 2020 Silverado LT With 38k miles. 
Has anyone seen issues where their AC periodically stops blowing cold air. Then I get the cluster reading service steering column, my gauges start fluttering and I lose my head lights. 
 

1st visit to dealership new battery and new AC compressor 

2nd due to same issue they couldn’t duplicate the problem

3rd no codes or errors were being picked up. Total of two months in and out of the dealership. 
 

I have video of when This happens. It is periodically. Some days it will PD 10 times others non. Took it to a local prominent AC repair shop he said it has to be electrical and he would t want to mess with it.  I am stumped And frustrated. I don’t know what do anymore.  

This is certainly not what we like to hear, Eric Sanchez.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2020 Chevrolet Silverado. To do so, please send an email to [email protected] with ATTN: Eric Sanchez/GM Trucks in the subject line.

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[Eliot]

   Hi,

   Could Erik Sanchez share what was the fix for the a/c issue (issues where their AC periodically stops blowing cold air).

 

   Tjhanks!!!

[Everest]

On 5/7/2023 at 12:29 PM, Eric Sanchez said:

I own a 2020 Silverado LT With 38k miles. 
Has anyone seen issues where their AC periodically stops blowing cold air. Then I get the cluster reading service steering column, my gauges start fluttering and I lose my head lights. 
 

1st visit to dealership new battery and new AC compressor 

2nd due to same issue they couldn’t duplicate the problem

3rd no codes or errors were being picked up. Total of two months in and out of the dealership. 
 

I have video of when This happens. It is periodically. Some days it will PD 10 times others non. Took it to a local prominent AC repair shop he said it has to be electrical and he would t want to mess with it.  I am stumped And frustrated. I don’t know what do anymore.  

I am also having the same issues periodically. I can’t seem to find the problem. I live in south so no issues of corrosion etc. but I did find a guy that fixed the similar problem which was a bad ground cable that had corroded/separated behind passenger side front wheel well/ floor board area. I checked mine and it’s good. I’ve also visually checked all the other areas and see no issues. 
I basically just clear the codes and it’s good for a little while. 

Next time yours does it notice the voltage gauge. Mine will spike well past the 14 mark and stay until I cut the engine off. 
 

But everything that you are describing is what happens with my truck
I can be driving normal and everything is fine and all of a sudden all of the service lights will come on for parking brake, steering four-wheel-drive, etc. and then the AC stops blowing cold air which means the compressor clutch will not engage because of a voltage problem,

 

I have heard so many stories of people taking their vehicle to the dealership just to have parts thrown at it when really, the issue are possibly in the wiring. This seems to be a common problem on these vehicles, and I wish there was a certified mechanic who could shed more light on this because taking to a dealer and having thousands of dollars spent on parts that are not needed because the root of the problem is being looked over it’s not fun

I also thought the battery may need be changed or I may need a new alternator, but I have no issues with cranking the truck like you would have with a bad battery or alternator that is not charging

 

I am very confused about the ground because there are so many areas to check because you have the in-line fuses on the battery post that could be an issue. You have ground cables that run from the negative post down to the firewall, another ground from the engine block to the firewall also a ground under the passenger side floor board wheel well area. Also, there is a possibility of a ground at the starter and heat shield as well as a few more places. I will post a pic of my dash and also the bulletin. I found online that may help.

If you come up with a solution, please share . 
Good luck  

 

 

[Kevin lambright]

My 22 high country seems to just close all damper doors. They keep throwing parts at it, evaporator core is the last thing. They are telling me it’s freezing up but when it happens it sounds like a jet plane. You can shut the truck down, wait three minutes and it works just fine. I keep telling them it is electrical issue. So the auto workers are on strike and they can’t make a 70k truck without issues. If I did that at my job, either one of them, I would kill someone or blow something up.

get the dealer to call the Chevrolet engineers, start a trail of paperwork, and have them dig deeper

[Mshawn]

On 5/7/2023 at 11:29 AM, Eric Sanchez said:

I own a 2020 Silverado LT With 38k miles. 
Has anyone seen issues where their AC periodically stops blowing cold air. Then I get the cluster reading service steering column, my gauges start fluttering and I lose my head lights. 
 

1st visit to dealership new battery and new AC compressor 

2nd due to same issue they couldn’t duplicate the problem

3rd no codes or errors were being picked up. Total of two months in and out of the dealership. 
 

I have video of when This happens. It is periodically. Some days it will PD 10 times others non. Took it to a local prominent AC repair shop he said it has to be electrical and he would t want to mess with it.  I am stumped And frustrated. I don’t know what do anymore.  

This definitely sounds like an electrical issue. I think one of the clues is “ service steering column” message on the cluster. This is where I would start. I would drop the knee bolster an with the engine running I would start wiggling wires.  It could be a ground underneath or behind the dash.  I’ve found so many problem by using this. Then I would move to the engine compartment anwiggle wires and move or wiggle the connectors. Hope this helps. If you find it do not fix it take it back to the dealership and show them and let them fix it. That way it’s in the history on that truck. Also I’ve noticed GM corporate has reached out to you. Take advantage of this opportunity. This is your first step to make sure the dealership follows through instead of shoving you of because this is a hard problem to fix and they will not make the money off of it and move the simpler work ignoring you and your problem. They will back flag the dealership and make sure you are satisfied. 

[Brandon E Faciane]

@GMCustomerService Experiencing the exact same trouble with both my truck and my wife’s Acadia. I drive a 2020 Chevrolet Silverado 1500 RST Texas Edition purchased brand new off the truck delivering to Matt Bower’s Chevy in Slidell, LA with 9 miles on it and have driven this truck 91,700 miles since purchasing. I also purchased my wife 2020 GMC Acadia SLT. We are consistent GM purchasers to date (37 years old with 3 children 14, 5, 3). BOTH of our GM vehicles were manufactured in 2020 and experiencing exact same electrical AC issues explained in this thread and all across the internet. I opted to fix my wife’s vehicle first and we paid thousands of dollars replacing compressor, replace blower, etc etc and none of these costly repairs have fixed the problem. I drive my truck across Louisiana and Mississippi for work so working AC extremely important with how hot it is most the year. The dealership attempted to pull me down the costly rabbit hole of uncertainty without expressing confidence in the root cause. I would greatly appreciate GM’s support advising Matt Bower’s Chevrolet Service department in Slidell, LA on how to fix this issue. 
 

My truck - While driving the air will stop blowing all together once a day or every other day when it’s hot outside. I always turn off my “auto-start” button but here lately it hasn’t been working without having to turn off that button manually. If I leave my truck running and the timer kills the engine 45 minutes later the when I get back in truck and start it the AC won’t blow any air. If I turn the engine off, open doors let the systems turn off and wait several minutes there’s a 50% chance the ac will begin working again. My touch screen dash appears to be working okay but when this issue occurs sometimes the temp dial will stay stuck in 63 degrees driver and 60 passenger even when the “SYNC” selected. If it’s really hot outside mid day and I am parked in sun there’s 100% certainty my AC won’t blow any air. When I park in shade the AC works just fine when I get in my truck and start engine. If the ac is working - I can drive from Slidell to Shreveport without AC troubles. If it’s cloudy or rainy I tend to have working AC and blower. When it’s hot outside it’s guaranteed to stop blowing entirely until I can stop my truck, let it sit in shade for 5 minutes, start back up fingers crossed.

 

before reaching this point - I used to run into the won’t blow cold air issue that everyone else is describing. Now, when this issue happens it won’t blow at all. Again, once I get it back working it blows cold air exactly as expected but if I plug my phone in for CarPlay, hot outside, someone calls and the AC auto turns down blower fan speed to limit noise there’s a 75% chance it stops blowing and I have to roll windows down to cool off until it begins working again or makes me stop somewhere to shut off truck wait 5 minutes then get back in and start truck again. This is beyond frustrating and it sounds like there may be a widespread issue reported online. Also - my gauges tend to change when experiencing this electrical issue that forces my AC and blower to stop working multiple times a day depending in how hot it is outside basically.  

 

My wifes 2020 GMC Acadia SLT DASH gauges all lit up, steering assist function error on screen behind wheel, gauges for oil, temp go haywire momentarily, AC blows hot air only but does remain blowing. 
 

In addition to purchasing/maintaining both of these GM vehicles (and owning GM my entire life), we’ve exhausted well over $15,000 at certified Chevy dealer service departments and thru 3rd party auto mechanics and the same issues persist both vehicles. Please help me get the right feedback to Matt Biwers Chevy Slidell Service  department so they can fix our vehicles asap! 
 

This outcome will 100% control whether we stay loyal GM customers. It’s time for me to purchase a new truck to stay in compliance with my company’s MOTUS program. My family of 5 and 2 dogs have outgrown my wife’s Acadia and we need to get her a full sized Tahoe or Suburban. My daughter will likely drive my wife’s Acadia if we can get the AC/electrical issues fixed. She may also want to drive my truck but that also depends on the trade in value realized in the next few months once I get this Electrical/AC issue fixed. My extended family is pro GM and I want to stay GM but would like to know that this issue is not going to come up again after buying my next truck. Help me prove that’s the right decision to my wife! My wife wants to take to Facebook and Twitter in search of answers but i want to give GM the opportunity to guide us before creating a stink over something that appears to be fixable based on your feedback on the post this is linked to. Please Help!
 

Thanks,

 

Brandon E Faciane 

9856651510

[email protected]

Edited October 7 by Brandon E Faciane
Cleaned up errors