I have a Problem with my AC on my 1996 Chevy Blazer. Its been vacuumed and Charged last week and its still blowing hot air inside my vehicle. The problem is That the duck vents under my dash won't shift from heat to air Please help. My other question is are the tire # 23570R15 the correct tire size for my vehicle because that's what's on it since I bought it and I'm about to purchase 4 new tires and want to be sure.
Sounds like the cable inside your dashboard duct is disconnected, so your blend doors are not working properly.
This may require some intensive labor to remove the dash and repair this cable. Your proper tire size is posted just inside your drivers door jam, this has the manufacturers recommendation.