After freon charge, AC went WARM

make sure the cooling fan is working if so the freon charge could be low

Is the compressor running ? What are the low and high pressure readings ?
Are the radiator fans running ?
Is one ac line cold and one hot in the engine compartment.

You likely need to charge the AC with freon. If it has been a year or three since you've had it checked, it is probably low on freon and needing to have some added.

If this was happening to me.... I'd goto an airconditioning re-gas centre and get them to check for gas leaks. In my old commodore the Evaporator Core was leaking and causing some of the issues you have mentioned.

If the car was retro fitted with R134a this was a common problem. There was a low side pressure sensor that needs to be changed. R134a runs different pressures than the r12.. When you go down the road the condenser cools off the system and the pressure drops below the minimum pressure. You need to make sure that the system is fully charged, not just cold to the feel. Both pipes coming out of the firewall need to be the same temp. this makes sure that the evaporator is flooded.
I hope this helped. Re-post if you need more info. Have a nice day and good luck.

you should go to a mechanic and check the A/C if the freon id low it won't cool , some time at mornig it give you the semsation that is cooling but probably not..

on my 99 devillle concours cold air blows from left and back vents but hot air blows from right vents

have you had the freon level checked? Sounds like it is low on freon. My lincoln did that and it was just low on freon.

The frosting of the line is normal. Did you use a gauge set when charging the unit? AND, most important, Did you evacuate the system before putting in the freon? Very important.What was your final low side reading and your final high side reading?

hi there, your either low on freon or the relay is kicking out sometimes, have the relay checked