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Ac not keeping up

Aimatdeer
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newdude Senior Enthusiast

newdude

Posted
Posted
23 hours ago, Atlas said:

 

I'm also surprised to hear your 2024 with the L8T is still using R134a? I was pretty sure the HD's had switched to the new refrigerant around 2020.

 

 

HDs and one or two other vehicles are still on R134a.  Most everything else is R1234yf.

 

Byrds8 Enthusiast

Byrds8

Posted
Posted

I miss the old R12 stuff. The AC in my 79 Camaro was amazing compared to most newer vehicles I have owned. It would also freeze the grass when you had a little left in the can lol.

kevin74 Enthusiast

kevin74

Posted
Posted

I'm not sure what my temps were, but it would take my 2024 about 4-5 miles of driving before my AC started cooling. They replaced my compressor under warranty. 

kevin74 Enthusiast

kevin74

Posted
Posted (edited)

Double post - sorry

Edited by kevin74
Double post
kevin74 Enthusiast

kevin74

Posted
Posted

I'm not sure what my temps were, but it would take my 2024 about 4-5 miles of driving before my AC started cooling. They replaced my compressor under warranty. 

Another JR Senior Enthusiast

Another JR

Posted
Posted

I don’t have detailed measurement data, but this past March we were hiking and camping in Death Valley and the Las Vegas area when this Spring’s heat wave hit with 105 plus temperatures and our 2021 L8T system kept our crew cab as cool as we wanted it (68F setting) with no trouble. Fan flows on auto once stabilized were fairly low. It seems like the OP’s system should be performing better. 

Aimatdeer Enthusiast

Aimatdeer

Posted
  • Author
Posted

Monday looks like a good day for the dealer to test an ac issue. Hopefully it all turns out good.Screenshot_20260626_210034_AccuWeather.thumb.jpg.0c870ad12584365154109f17fb8c8c3e.jpg

Aimatdeer Enthusiast

Aimatdeer

Posted
  • Author
Posted

Looks like I am getting a new compressor. It's on backorder so I will let you know. Not sure how long.

  • Like 1
Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted (edited)
On 6/21/2026 at 7:38 AM, Aimatdeer said:

 This was set at low. Max air fan speed high. 87 degrees and a little humid.

 

.Screenshot_20260621_083754_Gallery.jpg

 

On 6/22/2026 at 11:40 AM, newdude said:

 

 

So @Aimatdeer if there are no leaks, the charge of refrigerant is correct, and everything is operational (compressor, temp doors, clutch fan), it might be on the high end of normal per this chart.    

 

Screenshot2026-06-22150106.thumb.png.e0ac6c54be37e6100a45baec4538231a.png

 

 

Looks about right given the data provided. Could it be better? Perhaps. But in spec isn't going to get it that way under warranty. 

 

 

Edited by Grumpy Bear
Aimatdeer Enthusiast

Aimatdeer

Posted
  • Author
Posted

Anyone have any info about backorder time? It's classic 4th of July hot here in ohio.

Byrds8 Enthusiast

Byrds8

Posted
Posted

The dealership told me they have no idea. They also stated that the compressor has had six different part numbers too. Seems they may have issues making one that works. The loaner truck I had worked just as bad. The first 1-2 min was pure hot air before it even attempted to start cooling. After that, it didnt react that way the rest of the day.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

While you are waiting on parts...

 

On my last few vehicles I've been installing full ceramic UVA/UVB/Infrared blocking window tint even over the solar glass my 2015 was fitted with. At high sun angles on cloudless days this is HUGE reduction in compressor load (interior heat from radiation) and your personal comfort. The new generations of Refrigerant are not as efficient as they once were. 

 

I can't see my breath (meat locker style) but I can run the system on very low settings on very hot days and be quite comfortable. It keeps up well and if you use the recirculation until cooled down, it does so fairly quickly. If ultra humid stay in recirc. The blend door has a minimum; you won't suffocate. 

  • Like 1
Byrds8 Enthusiast

Byrds8

Posted
Posted

I miss the old school stuff. I have Xpel tent on every window in the truck. Sadly, FL heat said it didnt care. Granted, the system will still cool down the cab eventually. But man does it take a min. When you first get in you feel like youre the turkey on thanksgiving. 

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
1 hour ago, Byrds8 said:

I miss the old school stuff. I have Xpel tent on every window in the truck. Sadly, FL heat said it didnt care. Granted, the system will still cool down the cab eventually. But man does it take a min. When you first get in you feel like youre the turkey on thanksgiving. 

 

Open the doors for a few minutes to let out the heat. When you start up crack the windows until the air from the vents in cooler. Purge the heat held in the ducts from the dash acting as an insulator. Run the recirc once the windows are up. Pennies make a dollar. Use all the tricks. Even if you have tint, in an area like yours use those reflective sun screens. 

 

Educate yourself. Use your Fluke and an thermocouple on interior temps. Hang it from the mirror. See how even the angle you park at has an impact. 

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