I have a 2000 Dodge Dakota 4.7L Quad Cab. When the outside temp is above 85 degs, after driving for about 15 minutes the A/C will quit blowing cool air. The hotter it is outside the shorter duration until the cool air stops. If the outside temps are below 80 degs, the A/C will blow cool air all day long!

Charge is good, no leaks in the system and all else is well. Any assistance would be appreciated.

 

Check your condenser coil in front of the radiator. Take a hose/pressure washer and clean any dust/dirt outa there. An aerosol coil cleaner will do an even better job. Just take care not to bend the fins.