Hi,
When it starts blowing warm, have you noticed if the A/C compressor is still cycling on and off? If you turn it off and then right back on, does it work?
https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak
I'm questioning if the evaporator is freezing up or even there were issues with the low side pressure line can freeze up if the Freon is low. I realize you had it done recently, but anything is possible. As far as the evaporator freezing up, often times it is a result of the control module keeping the compressor engaged continuously. If nothing is freezing up, then we will have to check air door actuators. Something could be closing off the evaporator from the inside of the vehicle.
Let me know. Also, let me know if this has automatic climate control or not, if you hear the compressor cycling when there is no cold air, and pay attention to see if the compressor is cycling and not staying engaged all the time.
Take care,
Joe
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Saturday, May 2nd, 2020 AT 6:45 PM