Slow AC

[PFTX_5.3]

I know these trucks are plagued with AC issues. Mine is coming up on 3 years since the replacement. When I drive, I like to stay below 2000 RPMS, and when doing that, the AC takes 30 to 45 minutes to start blowing cold. But if I get in the truck and sit in neutral or park and run it at 3000 to 3500 RPMS within a minute of doing that the AC will blow ice cold to the point of freezing you out of the cab. Any ideas of what the issue could be?

[newdude]

Sounds like bad compressor?  Or something restricted like evaporator, condenser or expansion valve.   

[Snowcamo]

Sounds like:

Non condensibles in the system.  134a systems are plagued with that issue.  Given mvac standard vac is 0psi. 

 

If you have no leaks I'd just pull the refrigerant,  vacuum deep as possible and recharge.  

 

If you did not change the drier in the driver's side condenser now is a great time.  While at it id hose the ac condenser.