AC–27 AIR CONDITIONING SYSTEM – TROUBLESHOOTING HINT: • If the instruction "Proceed to next circuit inspection shown on matrix chart is given in the flow chart for each circuit, proceed to the circuit with the next highest number in the table to continue the check. • If the trouble still reappears even though there are no abnormalities in any of the other circuits, then check or replace the A/C amplifier. Column Headers (left to right): AC–52 AC–54 AC–56 AC–58 AC–60 AC–62 AC–66 AC–69 IN–35 AC–71 AC–76 AC–77 AC–107 AC–92 AC–91 AC–95 AC–96 AC–98 AC–97 Row Labels (top to bottom): Backup power source circuit IG power source circuit ACC power source circuit Heater relay circuit Blower motor circuit Compressor circuit A/C control assembly circuit t Temperature set dial circuit t A/C amplifier Refrigeration system inspection with manifold gauge set Refrigerant volume Drive belt tension Electric cooling fan Condenser Receiver Evaporator Heater radiator Expansion valve Water valve Table Data (row by row): Row 1: IG power source circuit=1, ACC power source circuit=2, A/C amplifier=3 Row 2: Heater relay circuit=1, Blower motor circuit=2, A/C amplifier=4 Row 3: Blower motor circuit=2, Compressor circuit=1, A/C amplifier=3 Row 4: Blower motor circuit=1, A/C control assembly circuit=2, A/C amplifier=3 Row 5: Compressor circuit=4, A/C control assembly circuit=14, Temperature set dial circuit=13, A/C amplifier=15, Refrigeration system inspection=3, Refrigerant volume=1, Drive belt tension=2 Row 6: A/C control assembly circuit=8, Temperature set dial circuit=7, A/C amplifier=9, Water valve=1 Row 7: A/C control assembly circuit=20, Temperature set dial circuit=19, A/C amplifier=21, Refrigeration system inspection=3, Refrigerant volume=1, Drive belt tension=2, Electric cooling fan=4, Condenser=14, Receiver=15, Evaporator=16, Heater radiator=17, Expansion valve=18, Water valve=5 Row 8: A/C control assembly circuit=6, Temperature set dial circuit=1, A/C amplifier=7 Row 9: A/C control assembly circuit=2, A/C amplifier=3 Row 10: A/C control assembly circuit=3, A/C amplifier=4 Row 11: Compressor circuit=1, A/C amplifier=2 Row 12: Compressor circuit=1, A/C amplifier=3 Row 13: Backup power source circuit=1, A/C amplifier=2