Auto Air Conditioning & Heater Repair: hot/cold, gmc yukon, cold system

Question
when i am driving down the road i get 52 deg air but when i stop or slow down it jumps to 80 deg or so. this is on 1995 gmc yukon z71.. this is a r134a system. what could i do to fix this problem.

Answer
HI ROB , FIRST YOU NEED TO CHECK THE STATE OF PRESSURE IN THE SYSTEMS.IF IT`S LOW ON CHARGE ADD 1LB. FIRST AND RECHECK PERFORMANCE.THE LOW SIDE PSI. SHOULD BE 20-30PSI NAD THE HIGH SIDE IS 180-210PSI. THAT`S A NORMAL FULL CHARGED AND COLD SYSTEM.

GOOD LUCK,DAVIDT