02 a/c not working

My 02 Monte SS only blows hot air. I just bought the refill kit, filled it up(it was already almost filled) and it still only blows warm air. I ran it with the air blowing full for about and hour on a ride and no change. This summer heat is killer, and the old lady doesnt like messing up her hair. LOL. any help?

Get a gauge manifold installed and check both low- and high-side pressures. Compare the readings to the T/P chart at the current ambient temperature, and see if they are reasonbly close to normal operating pressures.

Out of curiosity, how do you know the system "was already almost filled"?

I used a gauge that came on the cans. It said it was at a good level. My 95 blazer had a similar prob. I found out it was a wiring prob. a plug that connects to the canister to detect if the freon is to low was malfunctioning. Typical problem. I had to use a jumper wire to trick it. Not sure if this is the same im gonna try and repost results. If there are any other suggestions, please keep them coming