TC feedback cab air-con was not working.Unable to reset. Cab was warm. ~~~~~ 3570 TC feedback cab air-con was not working. Unable to reset. Cab was warm.  3570 cab A/c found having low pressure. Found suction line connector drifter with slight seepage. Tightened both suction/discharge line connectors. Discharged/vacuum/charged system. Function check - OK. Cab area temp.=24*C.  Chan SW 44665