A.C. blowing hot air when idling

sounds like you're low on freon

if this is true, you need to get a can of florescent freon so you can see where your leaking

Get a a/c gauge set and read what you have for high and low pressure sides. Mastercool.com has a chart posted for proper readings for ambient temps. Would also have a look at the condition of the a/c clutch assembly and make sure that it is operating and the bearing is not wobbly. If all that checks out you may have a sensor issue. Good Luck!

Mine had same problem. Turned out to be 25A ac fan blown. Replaced and works great now. Check fuse panel first.