Today we took this car on a tour of the southern mountains and foothills of North Carolina and noticed something strange with the air conditioner. When I pressed on the gas while going up hill the air was blowing cold but when I let off the gas coming down the hills the air wasn't cold. This car is just a regular 1996 Mustang with a 3.8 Liter engine.
My guess is that I'm chasing a bad vacuum line. Any other ideals?