Hey, Grumpy! I heard you were an expert and if you couldn't help me help could not be found! So, here's the deal: I have a 95 coupe, love the car, but I live in Arizona and when the A/C blows out the defrost vents instead of the dash vents it doesn't cool the car down much -- even though the air is cold. Would you give me a place to start looking for problem areas? I appreciate your help. HAVING A SHOP MANUAL FOR YOUR EXACT CAR HELPS.......WORKING ON A CORVETTE WITHOUT A SHOP MANUAL PUTS YOU AT A HUGE DISADVANTAGE http://www.helminc.com/helm/Result.asp? ... ted_media= start by pulling trouble codes and checking ALL FUSES theres some chance its just a stuck vent door in the air control routing in the duct work,as its possible for light trash like Kleenex to get sucked up into the dash, jamming the door or a vacuum line to be unplugged but it could also be a failed electrical component, unfortunately its going to require partial dis-assembly and inspection and testing so pull codes and think logically, look for loose connectors and use a multi meter The AC will only start after it senses a certain temperature. Press and hold the fan up/down buttons for 5-6 secs. It will show -00. Press auto-fan once. It will show any fault codes. 00 means everything OK. 09 for instance means low on freon. There are ten fault codes. http://chevythunder.com/199295_lt1_trouble_codes.htm toptechx6 posted this info "if the green LED above the climate control buttons is NOT flashing when the car is running, there are likely no fault codes stored. While you could have a more serious problem such the programmer, the first thing I would inspect is the three port vacuum check valve located under the right side fuel rail cover. It is common for the ports to break off as they become brittle due to age and temperature, when that happens the system defaults to defrost mode for safety reasons. The valve, (PN 15733271) is available from the dealer for less than $10, a universal version can also be found at many parts stores (one way vacuum check valve) In the pictures below the valve is the black and white plastic piece with three hoses attached, yours may look slightly different. The fuel rail cover is removed by pulling straight up, you can then inspect the valve."