Most AC problems are low freon or electrical. Pull the low pressure cutout
switch plug [ located on accumulator
or line to evaporator ] Short the two terminals, and try AC If clutch
turns, low freon is culprit. If clutch doesn't turn with switch jumpered,
If system runs, but doesn't chill air,
problem could be " blend door " Make sure vacuum line is connected.
I agree with other poster, who asks " Did this suddenly / or gradually