2002 2500 4x4 A/C blows cold coming out dash vent but also coming out floor heater vent. Have about 22 inches of vaccum. have replaced controller didnt not fix problem. Cant seem to find any hoses losing vac.anywhere

 

Mine had problems but it was the hard plastic line across the cowling had cracked but you couldn't see it. Pulled on it and iot came apart. Patched with flexible hose and all is well.

 

i think 2002 has all electronic controls, about three may be hard to get to..........do a search

 

try this link https://www.dieseltruckresource.com/...r+conditioning