Jump to content

A/C issue

littleal
 Share

Recommended Posts

littleal Enthusiast

littleal

Posted
Posted

I have a 2024HD L5P. I have it to 2 different dealers a total of 3 times. The problem is when you get in the truck and lets say it is 90 degrees in the truck the A/C will not go into full blast. It is set on auto at 71 degrees. This is an intermittent problem and of course the dealer can't duplicate it. I opened a case with GM last fall, Has anyone run into this problem? 

  • 2 weeks later...
  • 3 weeks later...
nfisherman Enthusiast

nfisherman

Posted
Posted
On 4/4/2026 at 12:30 PM, littleal said:

I have a 2024HD L5P. I have it to 2 different dealers a total of 3 times. The problem is when you get in the truck and lets say it is 90 degrees in the truck the A/C will not go into full blast. It is set on auto at 71 degrees. This is an intermittent problem and of course the dealer can't duplicate it. I opened a case with GM last fall, Has anyone run into this problem? 

I don’t know if this is your issue. In my ‘26 HD, this is controlled by a Comfort and Convenience setting in the DIC. Mine was bugging me until I found the setting. It was delivered with the max auto fan setting on “medium.” The high setting is an option and there’s a warning that high will be noisier. No kidding! I changed the setting and now it does what I want. 

  • 2 weeks later...
KARNUT Senior Enthusiast

KARNUT

Posted
Posted

I have 3 different brands with Automatic climate control. They work. I find myself making very few adjustments. Even my old Avalanche works well as long as the Freon is right. As hot as it gets here it adjust high automatically turns on max air. And adjust down when temperature settings are reached. Some vehicles don’t have dials anymore. Looking over going a mile a minute to make adjustments could be hazardous to your health. Especially when you’re paying attention to your phone at the same time. I don’t like it when I’m dodging people heading to my lane who can’t multitask. Long live climate control. 

asilverblazer Senior Enthusiast

asilverblazer

Posted
Posted
1 hour ago, KARNUT said:

They work. I find myself making very few adjustments. 

Same - usually a number between 68-70 in the summer, 72-74 in the winter.

  • Like 1
Pryme Senior Enthusiast

Pryme

Posted
Posted

Auto climate tends to run the ac when it’s not necessary. Always hated that. It will run it to clear the window when it’s not needed. I’m not a genius but I’m still smart enough to adjust a knob from the red side to the blue side if I am hot. The more electronics the more issues. It’s apparent daily reading this forum. 

asilverblazer Senior Enthusiast

asilverblazer

Posted
Posted
On 5/20/2026 at 3:03 PM, Pryme said:

Auto climate tends to run the ac when it’s not necessary. Always hated that. It will run it to clear the window when it’s not needed. I’m not a genius but I’m still smart enough to adjust a knob from the red side to the blue side if I am hot. The more electronics the more issues. It’s apparent daily reading this forum. 

It 'automatically' runs to control humidity.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
17 minutes ago, asilverblazer said:

It 'automatically' runs to control humidity.

The down on automatic people would probably lose their mind if they found out the AC comes on with defrost.

Atlas Senior Enthusiast

Atlas

Posted
Posted

I don't think the OP's question was ever answered. Sometimes the HVAC doesn't run full-blast to bring the temp down to the set temperature. He gave the example of a 90-degree day (inside of the car is probably ~120+) and the system being set to 71 degrees and not activating fully when he restarts the truck.

 

I would have suspected the Auto Fan setting too, but the problem sounds intermittent, and it sounds like it does run on high as part of the auto setting.

Atlas Senior Enthusiast

Atlas

Posted
Posted
1 hour ago, KARNUT said:

The down on automatic people would probably lose their mind if they found out the AC comes on with defrost.

 

Or on modern systems, manual or auto HVAC systems can call for the AC compressor to run in any vent mode or blend door setting based on ambient humidity. Even with the AC button on the controls off/disabled. It's kind of annoying.

 

I find that I can get along with auto HVAC systems, mostly. But really I'd prefer simpler and manually adjustable fan speed/temp/vent setting knobs. We're talking about the inside of a car, not a multi-story building with many rooms.

  • Like 1
KARNUT Senior Enthusiast

KARNUT

Posted
Posted
16 minutes ago, Atlas said:

 

Or on modern systems, manual or auto HVAC systems can call for the AC compressor to run in any vent mode or blend door setting based on ambient humidity. Even with the AC button on the controls off/disabled. It's kind of annoying.

 

I find that I can get along with auto HVAC systems, mostly. But really I'd prefer simpler and manually adjustable fan speed/temp/vent setting knobs. We're talking about the inside of a car, not a multi-story building with many rooms.

Some vehicles only have touch pads to control their Ac, heat. Looking over while driving over one mile per minute could be hazardous to life. A good climate control system eliminates that. I have three different vehicles with automatic climate control. They work well. As far as a building it be pretty hard to wreck a building, it doesn’t move. Vehicles do. I rarely have to adjust my AC.

Pryme Senior Enthusiast

Pryme

Posted
Posted
17 hours ago, KARNUT said:

Some vehicles only have touch pads to control their Ac, heat. Looking over while driving over one mile per minute could be hazardous to life. A good climate control system eliminates that. I have three different vehicles with automatic climate control. They work well. As far as a building it be pretty hard to wreck a building, it doesn’t move. Vehicles do. I rarely have to adjust my AC.

It takes less than 1 second to glance over to turn a knob. I don’t recall the freeways littered with wrecked vehicles pre auto cc from ppl making deadly adjustments going down the road. Just a little ribbing but really. Not a big deal.  Huge tablet sized screens needed to do most things in modern vehicles are way more attention demanding than a basic hot cold dial. 

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
35 minutes ago, Pryme said:

It takes less than 1 second to glance over to turn a knob. I don’t recall the freeways littered with wrecked vehicles pre auto cc from ppl making deadly adjustments going down the road. Just a little ribbing but really. Not a big deal.  Huge tablet sized screens needed to do most things in modern vehicles are way more attention demanding than a basic hot cold dial. 

It’s really amusing to me how people will spend a small fortune to buy the latest technology. But automatic climate control can’t be trusted or efficient. 

asilverblazer Senior Enthusiast

asilverblazer

Posted
Posted
20 hours ago, Atlas said:

I don't think the OP's question was ever answered. Sometimes the HVAC doesn't run full-blast to bring the temp down to the set temperature. He gave the example of a 90-degree day (inside of the car is probably ~120+) and the system being set to 71 degrees and not activating fully when he restarts the truck.

 

I would have suspected the Auto Fan setting too, but the problem sounds intermittent, and it sounds like it does run on high as part of the auto setting.

Must've run him off. 

I could have used a little more description of what the conditions were, what the settings on the controls were, plus the setting for "automatic fan speed", what did intermittent mean based on the above? The automatic climate control uses a LOT of inputs to determine what to do, even including the ambient light sensor.

 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      The Peckish Synapse

      By KARNUT · Posted

      If it has a stick I can have fun with it. When my wife first got her Acura years ago I used to tease her about it. I was only interested in muscle cars. They’re gone now. So once a month I drive the Acura. Every once in a while I’ll take it to Redline. But just normal driving on some twisty back roads usually does the trick. 
    • contrabombarde
      2010 Avalanche 5.3 not running correctly after engine swap.

      By contrabombarde · Posted

      I went through again with a test light and everything checked out.    I suppose it could be the MAF itself but I've tried 3 different sensors, 2 of which were in running vehicles previously (the one in this truck, and the one in the donor truck), as well as a new one I picked up from NAPA. I would just be surprised if all 3 were bad.   EDIT/UPDATE: I swapped in the MAP sensor that was originally with the 2010 PCM, that made the code for map sensor voltage high Go away, and the map sensor seems to read normal with key on engine off (14psi or so), but it still doesn't run and does the same thing as before.
    • Atlas
      No Software Updates - Old Build

      By Atlas · Posted

      In addition to a cell or wifi connection, the infotainment needs to be enabled to download software updates. That's a toggle within the system settings.   But...if the truck was prevented from receiving updates in a past life, missing a bunch of updates may mean it won't go back and download all of those because they're not available or the system is too far out of date.   If a formal recall depends on a software update, the recall for that truck remains in an open status until it's applied. The dealer would need to apply the software update in that instance.   Most updates downloaded and applied via the infotainment aren't recalls/safety recalls, they're enhancements and usability fixes which aren't critical.
    • Vu1can
      Brake Pad Warning Message

      By Vu1can · Posted

      Recently I've been getting a message, "New Brake Pads Detected. Reset Brake Pad Life?", But I haven't had the pads replaced and the truck only has 28,000 miles. The Brake Pad Life shows Front 64% and Rear 79%. I select NO to resetting the brake pad life and the message goes away but comes back at the nest restart.   I stopped by the dealer and was told that it sounds like a software glitch that would require reprogramming. Even though I have the extended warranty, they tell me that reprogramming is not covered unless a module was actually bad and needed to be replaced. Simply reprogramming is not covered. So, they want $200.00 just to diagnose the problem. If it turns out no bad module, another charge on top of that to do the reprogramming. If the cause was an actual bad module, everything would be covered under the warranty.   Just wondering if anyone else has had this problem. Should this issue be covered under the warranty?   Thanks
    • newdude
      Tire psi

      By newdude · Posted

      NHT is diesel only, correct.     The GVWRs for NHT on 3/4 ton bring them to the same numbers as many of the 2WD 1 tons.  A crew 4x4 standard 3/4 with NHT is 11,750lbs, a 1 ton same cab/box/4x4 is 12,100lbs.     Hubs and hub bearings are the same for 11.5" and 12" axles.  Housing, diff carrier and ring/pinion are larger for the 12".   All gas use the 11.5" axle, 3/4, 1 ton and 1 ton DRW. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...