Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| All functions of air conditioning system do not operate. | Harness or connector | - |
| Air conditioning control assembly | ||
| Air conditioning amplifier assembly | ||
| Air flow control: No blower operation. (blower motor does not operate) | Harness or connector | - |
| Blower resistor | ||
| Air conditioning control assembly | ||
| Blower with fan motor sub-assembly | ||
| Air flow control: No blower control. (blower motor does not change speed) | Harness or connector | - |
| Blower resistor | ||
| Air conditioning control assembly | ||
| Air flow control: Insufficient air comes out. | Harness or connector | - |
| Blower resistor | ||
| Air conditioning control assembly | ||
| Blower with fan motor sub-assembly | ||
| Temperature control: Cooling effectiveness is poor.* | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| No. 1 cooler expansion valve | ||
| Magnet clutch assembly | ||
| Compressor assembly with magnet clutch | ||
| Air conditioning amplifier assembly | ||
| Temperature control: No cool air comes out.* | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| Air conditioner pressure switch | ||
| Harness or connector | - | |
| No. 1 cooler thermistor (front evaporator temperature sensor) | ||
| Magnet clutch assembly | ||
| Compressor assembly with magnet clutch | ||
| Air conditioning control assembly | ||
| Air mix damper control sub-assembly | ||
| Defroster damper control sub-assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| No. 1 cooler expansion valve | ||
| No. 1 cooler evaporator sub-assembly | ||
| Temperature control: Output air is warmer or cooler than set temperature or response is slow.* | Refrigerant volume | |
| Refrigerant pressure | ||
| Check refrigerant line | ||
| Air conditioner pressure switch | ||
| Harness or connector | - | |
| No. 1 cooler thermistor (front evaporator temperature sensor) | ||
| Magnet clutch assembly | ||
| Compressor assembly with magnet clutch | ||
| Air conditioning control assembly | ||
| Air mix damper control sub-assembly | ||
| Defroster damper control sub-assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| No. 1 cooler expansion valve | ||
| No. 1 cooler evaporator sub-assembly | ||
| Temperature control: No temperature control. | Air conditioning control assembly | |
| No air inlet control. | Air conditioning control assembly | |
| Engine idle-up does not occur, or is continuous. | Magnet clutch assembly | |
| Compressor assembly with magnet clutch | ||
| Harness or connector | - | |
| Air conditioning control assembly | ||
| Air conditioning amplifier assembly | ||
| Proceed to SFI system |
*: Check that the radiator, condenser and intercooler are not blocked with leaves, dirt or insects, and clean them if necessary. Also check the installation condition of the hose connection, and check for corrosion, etc.