AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS TABLE
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.
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of the A/C system do not operate. | A/C fuse | - |
| Air conditioning amplifier assembly | ||
| Harness or connector | - | |
| Air flow control: No blower operation. | HTR fuse | - |
| HTR relay | ||
| Blower motor with fan sub-assembly | ||
| Heater control and accessory assembly | ||
| Harness or connector | - | |
| Air flow control: No blower control. | Blower resistor | |
| Heater control and accessory assembly | ||
| Harness or connector | - | |
| Air flow control: Insufficient air flow. | Blower motor with fan sub-assembly | |
| Blower resistor | ||
| Heater control and accessory assembly | ||
| Harness or connector | - | |
| Temperature control: No cool air comes out. | Refrigerant volume | |
| Refrigerant pressure | ||
| A/C COMP fuse | - | |
| A/C COMP relay | ||
| Heater control and accessory assembly (A/C switch) | - | |
| No. 1 pressure switch | - | |
| Cooler compressor assembly | - | |
| No. 1 cooler thermistor | ||
| Air mix damper control cable sub-assembly | - | |
| Cooler expansion valve | - | |
| No. 1 cooler evaporator sub-assembly | - | |
| Cooler condenser assembly | ||
| Air conditioning amplifier assembly | ||
| ECM | ||
| Harness or connector | - | |
| Temperature control: No warm air comes out. | Heater control and accessory assembly (air mix switch) | - |
| Air mix damper control cable sub-assembly | - | |
| Heater radiator unit sub-assembly | - | |
| Harness or connector | - | |
| Temperature control: Output air is warmer or cooler than the set temperature or response is slow. | Refrigerant volume | |
| Refrigerant pressure | ||
| Heater control and accessory assembly (A/C switch) | - | |
| No. 1 pressure switch | - | |
| Cooler compressor assembly | - | |
| No. 1 cooler thermistor | ||
| No. 1 cooler evaporator sub-assembly | - | |
| Cooler condenser assembly | ||
| Air mix damper control cable sub-assembly | - | |
| Heater radiator unit sub-assembly | - | |
| Air conditioning amplifier assembly | ||
| ECM | ||
| Harness or connector | - | |
| No air inlet control. | Air inlet damper control cable sub-assembly | - |
| No air flow mode control. | Defroster damper control cable sub-assembly | - |
| Engine idle speed increase does not occur, or is continuous. | Cooler compressor assembly | - |
| Heater control and accessory assembly (A/C switch) | - | |
| Air conditioning amplifier assembly | ||
| ECM | ||
| Harness or connector | - |