| Condition | Possible Cause | Action |
|---|---|---|
|
Cool air won’t come out (A/C system won’t operative)
|
No refrigerant
|
Perform recover, evacuation and charging.
|
|
Fuse blown
|
Check fuses in main and circuit fuse boxes, and check for short circuit to ground.
|
|
|
A/C switch faulty
|
Check A/C switch.
|
|
|
Blower fan switch faulty
|
Check blower fan switch referring to
Heater Blower Fan Switch Inspection
.
|
|
|
A/C evaporator thermistor faulty
|
Check A/C evaporator thermistor.
|
|
|
Dual pressure switch faulty
|
Check dual pressure switch.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
ECT sensor faulty
|
Check ECT sensor referring to
Engine Coolant Temperature (ECT) Sensor Inspection:M13A
.
|
|
|
ECM and its circuit faulty
|
Check ECM and its circuit referring to
Inspection of ECM and Its Circuits:M13A without VVT
.
|
|
|
4WD controller faulty
|
Check 4WD controller referring to
Inspection of 4WD Control Module and Its Circuits
.
|
|
|
Cool air won’t come out (A/C compressor won’t operative)
|
Magnet clutch faulty
|
Check magnet clutch.
|
|
Compressor drive belt loosen or broken
|
Adjust or replace drive belt.
|
|
|
Compressor faulty
|
Check compressor.
|
|
|
ECM faulty
|
Check ECM and its circuit referring to
Inspection of ECM and Its Circuits:M13A without VVT
.
|
|
|
Cool air won’t come out (A/C condenser cooling fan motor won’t operative)
|
Fuse blown
|
Check “A/C” fuse in main fuse box, and check short circuit to ground.
|
|
Condenser cooling fan motor relay faulty
|
Check condenser cooling fan motor relay.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Condenser cooling fan motor faulty
|
Check condenser cooling fan motor.
|
|
|
Cool air won’t come out (Blower fan motor won’t operative)
|
Fuse blown
|
Check fuse in main and circuit fuse boxes, and check short circuit to ground.
|
|
Blower fan motor resistor faulty
|
Check blower fan motor resister referring to
Heater Blower Resistor Inspection
.
|
|
|
Blower fan switch faulty
|
Check blower fan switch referring to
Heater Blower Fan Switch Inspection
.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Blower fan motor faulty
|
Check blower fan motor referring to
Heater Blower Motor Inspection
.
|
|
|
Cool air won’t come out or insufficient cooling (A/C system normal operative)
|
Insufficient or excessive charge of refrigerant
|
Check charge of refrigerant and system for leaks.
|
|
Condenser clogged
|
Check condenser.
|
|
|
A/C evaporator clogged or frosted
|
Check A/C evaporator and A/C evaporator thermistor.
|
|
|
A/C evaporator thermistor faulty
|
Check A/C evaporator thermistor.
|
|
|
Expansion valve faulty
|
Check expansion valve.
|
|
|
Receiver/dryer clogged
|
Check receiver/dryer.
|
|
|
Compressor drive belt loosen or broken
|
Adjust or replace drive belt.
|
|
|
Magnetic clutch faulty
|
Check magnetic clutch.
|
|
|
Compressor faulty
|
Check compressor.
|
|
|
Air in A/C system
|
Replace receiver/dryer, and perform evacuation and charging.
|
|
|
Air leaking from cooling unit or air duct
|
Repair as necessary.
|
|
|
Heater and ventilation system faulty
|
Check air inlet box (cooling unit), heater control lever assembly and heater unit.
|
|
|
Blower fan motor faulty
|
Check blower fan motor referring to
Heater Blower Motor Inspection
.
|
|
|
Excessive compressor oil existing in A/C system
|
Pull out excessive compressor oil in A/C system circuit, and replace compressor.
|
|
|
Cool air won’t come out only intermittently
|
Wiring connection faulty
|
Repair as necessary.
|
|
Expansion valve faulty
|
Check expansion valve.
|
|
|
Excessive moisture in A/C system
|
Replace receiver/dryer, and perform evacuation and charging.
|
|
|
Magnetic clutch faulty
|
Check magnetic clutch.
|
|
|
Excessive charge of refrigerant
|
Check charge of refrigerant.
|
|
|
Thermal switch faulty
|
Check thermal switch.
|
|
|
Cool air comes out only at high speed
|
Condenser clogged
|
Check A/C condenser.
|
|
Insufficient charge of refrigerant
|
Check charge of refrigerant.
|
|
|
Air in A/C system
|
Replace receiver/dryer, and perform evacuation and charging.
|
|
|
Compressor drive belt loosen or broken
|
Adjust or replace drive belt.
|
|
|
Compressor faulty
|
Check compressor.
|
|
|
Cool air won’t come out only at high speed
|
Excessive charge of refrigerant
|
Check charge refrigerant.
|
|
A/C evaporator frosted
|
Check A/C evaporator and A/C evaporator thermistor.
|
|
|
Insufficient velocity of cooled air
|
A/C evaporator clogged or frosted
|
Check A/C evaporator and A/C evaporator thermistor.
|
|
Air leaking from cooling unit or air duct
|
Repair as necessary.
|
|
|
Blower fan motor faulty
|
Check blower fan motor referring to
Heater Blower Motor Inspection
.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
| Condition | Possible Cause | Action |
|---|---|---|
|
Cool air does not come out (A/C system doesn’t operate)
|
No refrigerant
|
Perform recover, evacuation and charging.
|
|
Fuse blown
|
Check fuse in main and circuit fuse boxes, and check short circuit to ground.
|
|
|
A/C switch faulty
|
Check A/C switch.
|
|
|
Heater blower fan switch faulty
|
Check heater blower fan switch referring to
Heater Blower Fan Switch Inspection
.
|
|
|
A/C evaporator temperature sensor faulty
|
Check A/C evaporator temperature sensor.
|
|
|
Refrigerant pressure sensor faulty
|
Check refrigerant pressure sensor.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
ECT sensor faulty
|
Check ECT sensor referring to
Engine Coolant Temperature (ECT) Sensor Inspection:K9K
.
|
|
|
ECM and its circuit faulty
|
Check ECM and its circuit.
|
|
|
Cool air dose not come out (A/C compressor doesn’t operate)
|
Magnet clutch faulty
|
Check magnet clutch.
|
|
Compressor drive belt loosen or broken
|
Adjust or replace drive belt.
|
|
|
Compressor relay faulty
|
Check compressor relay.
|
|
|
Compressor faulty
|
Check compressor.
|
|
|
ECM faulty
|
Check ECM and its circuit.
|
|
|
Thermal switch faulty
|
Check thermal switch.
|
|
|
Cool air does not come out (A/C condenser cooling fan motor doesn’t operate)
|
Fuse blown
|
Check fuse in main fuse box, and check short circuit to ground.
|
|
Condenser cooling fan motor relays faulty
|
Check condenser cooling fan motor relays.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Condenser cooling fan motor faulty
|
Check condenser cooling fan motor.
|
|
|
Cool air does not come out (Heater blower motor doesn’t operate)
|
Fuse blown
|
Check fuse in main and circuit fuse boxes, and check short circuit to ground.
|
|
Heater blower resistor faulty
|
Check heater blower resister referring to
Heater Blower Resistor Inspection
.
|
|
|
Heater blower fan switch faulty
|
Check blower fan switch referring to
Heater Blower Fan Switch Inspection
.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Heater blower motor faulty
|
Check heater blower referring to
Heater Blower Motor Inspection
.
|
|
|
Cool air does not come out (A/C system normal operates)
|
Insufficient or excessive charge of refrigerant
|
Check charge of refrigerant and system for leaks.
|
|
Condenser clogged
|
Check condenser.
|
|
|
A/C evaporator clogged or frosted
|
Check A/C evaporator and A/C evaporator thermistor.
|
|
|
A/C evaporator temperature sensor faulty
|
Check A/C evaporator temperature sensor.
|
|
|
Expansion valve faulty
|
Check expansion valve.
|
|
|
Receiver/dryer clogged
|
Check receiver/dryer.
|
|
|
Compressor drive belt loosen or broken
|
Adjust or replace drive belt.
|
|
|
Magnetic clutch faulty
|
Check magnetic clutch.
|
|
|
Compressor faulty
|
Check compressor.
|
|
|
Air in A/C system
|
Replace receiver/dryer, and perform evacuation and charging.
|
|
|
Air leaking from cooling unit or air duct
|
Repair as necessary.
|
|
|
Heater and ventilation system faulty
|
Check air inlet box (cooling unit), heater control lever assembly and heater unit.
|
|
|
Heater blower motor faulty
|
Check heater blower motor referring to
Heater Blower Motor Inspection
.
|
|
|
Excessive compressor oil existing in A/C system
|
Pull out compressor oil in A/C system circuit, and replace compressor.
|
|
|
Cool air doesn’t come out only intermittently
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
Expansion valve faulty
|
Check expansion valve.
|
|
|
Excessive moisture in A/C system
|
Replace receiver/dryer, and perform evacuation and charging.
|
|
|
Magnetic clutch faulty
|
Check magnetic clutch.
|
|
|
Excessive charge of refrigerant
|
Check charge of refrigerant.
|
|
|
Thermal switch faulty
|
Check thermal switch.
|
|
|
Cool air comes out only at high speed
|
Condenser clogged
|
Check A/C condenser.
|
|
Insufficient charge of refrigerant
|
Check charge of refrigerant.
|
|
|
Air in A/C system
|
Replace receiver/dryer, and perform evacuation and charging.
|
|
|
Compressor drive belt loosen or broken
|
Adjust or replace drive belt.
|
|
|
Compressor faulty
|
Check compressor.
|
|
|
Cool air won’t come out only at high speed
|
Excessive charge of refrigerant
|
Check charge refrigerant.
|
|
A/C evaporator frosted
|
Check A/C evaporator and A/C evaporator temperature sensor.
|
|
|
Velocity of cooled air is insufficient
|
A/C evaporator clogged or frosted
|
Check A/C evaporator A/C evaporator temperature sensor.
|
|
Air leaking from cooling unit or air duct
|
Repair as necessary.
|
|
|
Heater blower motor faulty
|
Check blower motor referring to
Heater Blower Motor Inspection
.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|