HVAC 38 2 No cool air TROUBLESHOOTING HINTS : A/C compressor system malfunction - Step 2 or A/C switch system malfunction - Step 3, 4 Step Inspection Action 1 Inspect air blow out Does air blow out? Yes Go to next step No Go to step 1 of troubleshooting indexes No. 1, 2 2 Inspect A/C compressor operation Start engine Turn both A/C switch and blower switch on. Does A/C compressor operate? Yes Go to next step No Go to next step 3 Inspect A/C switch indicator light Does A/C switch indicator light illuminate Yes Go to step 5. NO Go to next step. 4 Inspect A/C switch Is it okay? Yes Inspect wiring harness between climate control unit and resistor. No Replace climate control unit. 5 Inspect A/C relay (Coil-side) Is it okay? Yes Repair wiring harness between A/C relay and PWM (Terminal S). No Replace A/C relay. 6 Inspect A/C relay (Switch-side) Is it okay? Yes Install A/C relay, then go to next step. No Replace A/C relay. 7 Verify whether malfunction is in magnetic clutch and thermal protector or wiring harness (Between a/c relay and magnetic clutch) Test voltage at magnetic clutch connector terminal A (A/C control signal). Is voltage approximately 12 V? Yes 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. No Repair wiring harness between A/C relay and magnetic clutch, then go to next step. 8 Verify that malfunction symptom occurs after repair Does cool air blow out? (Is refrigerant system performance test result correct?) Yes Troubleshooting completed. Explain repairs to customer. No Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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