Ac not keeping up

[newdude]

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]

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]

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]

Double post - sorry

Edited June 23 by kevin74
Double post

[kevin74]

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]

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]

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

[Aimatdeer]

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

[Byrds8]

Yep mine is on backorder also.

[Grumpy Bear]

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.

 

.

 

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.    

 

 

 

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 1 hour ago by Grumpy Bear