2020 AC Not Blowing Cold

ERNursebev72 said:

Went to AutoZone and replaced the battery today. Still no cold air

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You said earlier that you charged the original battery (that died). Did your jump-start the vehicle’s engine when it had a dead battery (perhaps causing electrical damage)? Have you scanned the vehicle for any stored trouble codes?

The trucks have AGM batteries, once they are completely discharged they have to be replaced. Some weird test manufacture requires takes 4 hours if your trying to get it under warranty. If you want software updates the AGM must test above 50%, or update won’t run, that mean you may get a new battery as part of the software update. @ERNursebev72 go to dealer, you are at or near end of your warranty, you won’t fix this yourself.

Is the AC compressor clicking on and off rapidly every few seconds?

Just had a very similar issue: 2019 Max Limited. Went on vacation for 10 days, battery wasn't fully discharged, but after it sat for the 10 days the AC blew external temp air. Checked blend door operation by switching to heat, and it blows HOT, so that's not the issue. Checked the refrigerant at the low-side port and it read low, so I put part of a 12-oz can of R1234YF in, and it's up in the green for pressure, but still only blowing 'cool(ish)', vice ice-cold like it did when we parked it.

Next steps for me, and what you might look into:
-I have a set of A/C line gauges on order, so I'll be able to see the static pressure on both sides when the compressor isn't on, then both the high and low pressures when the compressor is on. Gauge on the fill adapter shows ~110psi on the low side w/o the compressor on, and ~40psi (mostly guessing since the gauge isn't marked very well) on the low side with the compressor running. I went ahead and ordered the gauges so I can check both sides simultaneously when the compressor kicks on to see if it's over-filled.
-I need to check on the active vent shutter operation to see if they're staying stuck closed when the truck is on. With zero air-flow, it would pretty much kill any ability of the radiator or condenser to dissipate heat.

Interested to see what other steps you take to see if any of them fix the problem.

Random temp fix it happens on my 2018. What works best for me is turning the rear AC on even if no one is there and front AC runs cooler. Sometimes randomly driving the AC gets really cold!

Did you check refrigerant level?

ERNursebev72 said:

Went to AutoZone and replaced the battery today. Still no cold air

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What have you resolved or determined?

ERNursebev72 said:

Hello There!

About a week ago, the battery died. I had it charged back up and it started fine. But now the AC is not blowing cold. It was working perfectly fine prior to that - blowing cold and hard air.

Issue:
Blowing and hearing compressor click. No cold air. Also a increase/decrease in fan speed on deceleration/acceleration.

Things checked:
Reset the BMS
Reset the SYNC system
Pulled out Fuse 32 that belongs to AC Clutch - intact

I am looking at the fuse diagram and don't see anything else that is obvious that could be AC.

I am a nurse so I can help bring people back to life, but I am also a woman. I prefer to try to figure these things out on my own before taking it to a mechanic and spending more than I need to.

It has 60K miles no previous issues.
Engine 3.5L GTDI

Ideas?

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If all fuses were checked and still no cold air, it could be low on refrigerant, bad AC compressor clutch, vacuum issues, control panel?
Is your AC light on at the dash controls? Does MAX AC make any difference? Do you hear the compressor engaging under the hood, and if visible, can you see the clutch engaged? If possible, when you put your hand around the fat AC pipe is it cold?