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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 switch indicator light
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 voltage at magnetic 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 result
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.
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1
2
3
4
5
*6
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8
STEP INSPECTION
ACTION