2005 Isuzu Ascender 6cyl--auto-- all power--2 wheel dr-- Air cond blows very little air that is only slightly cooler than the outside temp. This only happens during hot weather( 90 Fahrenheit or higher ) after highway driving for extended periods of time, usually after a few hours. It works as it should during any other conditions. After letting everything cool down, it works properly. The dealer says they cannot get it to duplicate this action and therefor says there is nothing wrong with it. I first noticed this at about 50,000 miles because that was my first trip in it. It now has 70,000 miles.