HVAC SYSTEM (HEATER, VENTILATOR AND A/C) > General Diagnostic Table

INSPECTION

Symptom

Repair order

Blower motor

Does not operate.

Fuse

Blower motor relay

Wiring harness

Blower motor

Blower motor resistor (Manual A/C only)

Blower switch

Noise

Blower motor

Compressor

Does not operate.

Refrigerant

Fuse

Air conditioning relay

Wiring harness

Magnet clutch

Compressor

Pressure switch

A/C switch

Blower switch

Noise

V-belt

Magnet clutch

Compressor

Condenser fan

Does not operate.

Fuse

Sub fan relay

Wiring harness

Noise

Condenser fan motor

Cold air not emitted.

Refrigerant

V-belt

Magnet clutch

Compressor

Pressure switch

Blower fan relay, blower motor

A/C switch

Blower switch

Wiring harness

Heater duct

Heater vent duct

Control module

Expansion valve

Evaporator

Air mix actuator (Auto A/C), Temperature adjustment cable (Manual A/C)

Warm air not emitted.

Engine coolant

Aspirator hose

Blower switch

Air mix actuator (Auto A/C), Temperature adjustment cable (Manual A/C)

Heater core

Temperature of air from vents does not change.

Wiring harness

Air mix actuator (Auto A/C), Temperature adjustment cable (Manual A/C)

Temperature adjustment switch

Unable to switch blow vents.

Wiring harness

Mode actuator (Auto A/C), Mode switch cable (Manual A/C)

MODE switch

Unable to switch suction vents.

Wiring harness

FRESH/RECIRC actuator

FRESH/RECIRC switch