2002 Tribute A/C Shuts Down
 

In the past year and a half, the A/C shuts downs when driving on the highway with even the slightest of uphill grade. It takes forever to start working once level or downhill. Not very cold at any time. Just serviced with a complete freon fill and replacement of input valve. Did not solve the problem. Anyone having similar problems and know if there is a specific fix?:confused: