A/C intermittantly works on 2005 Cadillac Escalade

The A/C works and blows cold air, then switches to hot air. If I stop and turn the car off, then back on the A/C again blows cold air. Any suggestions?

Asked by for the 2005 Cadillac Escalade
How did you fix this issue !???
2 more answers
This must be a common problem. My '05 does the same thing. The hot air only blows out the driver side vents, the other vents are cool. On a hot Florida day, when this happens, you can't wait to get to a stop sign so you can shut the vehicle off and restart it to get it to blow cool air again!
i need the answer to this question ; how do i resolve this problem ?