848 HVAC • A/C switch system malfunction - Step 3, 4 INSPECTAIR BLOWOUT Does air blow out? INSPECT A/C COMPRESSOR OPERATION Start engine. Turn bothA/C switch and blower switch on. DoesA/C compressor operate? INSPECT A/C SWITCH INDICATOR LIGHT Does A/C swi tch indicator l ight illuminate INSPECTA/C SWITCH Inspect A/C switch is it okay? INSPECTA/C RELAY (COIL-SIDE) Inspect A/C relay. Is it okay? INSPECTA/CRELAY (SWITCH-SIDE) Inspect A/C relay. Is it okay? VERIFYWHETHERMALFUNCTION IS IN MAGNETIC CLUTCH AND THERMAL PROTECTORORWIRING HARNESS (BETWEEN A/C RELAY ANDMAGNETICCLUTCH) Test vol tage at magnet ic clutch connector terminal A (A/C control signal). Is voltage approximately 12 V? VERIFY THAT MALFUNCION SYMPTOMOCCURSAFTERREPAIR Does cool air blow out? (Is refrigerant system performance test resul t correct?) 2 No cool air TROUBLESHOOTINGHINTS • A/C compressor system malfunction - Step 2 Go to next step Go to step 1 of troubleshooting indexes No. 1, 2 Go to next step Go to next step Go to step 5. Go to next step. Inspect wiring harness between climate control unit and resistor. Replace climate control unit. Repair wiring harness betweenA/C relay and PCM (terminal S). Replace A/C relay. Install A/C relay, then go to next step. Replace A/C relay. Inspect magnetic clutch, If magnetic clutch is normal: Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs. If magnetic clutch is malfunctioning: Replace compressor, then go to next step. Repair wiring harness betweenA/C relay and magnetic clutch, then go to next step. Troubleshooting completed. Explain repairs to customer. Recheck malfunction symptoms, then repeat from Step 1 if malfunction recures. Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No 1 2 3 4 5 *6 *7 8 STEP INSPECTION ACTION
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