Fundamental Procedures of Troubleshooting

FUNDAMENTAL PROCEDURES OF TROUBLESHOOTING
Proceed with troubleshooting of the heater and air conditioner by following the steps below.






CHECKLIST
- When inspecting the heater or air conditioner, warm up the engine before each operational check. The engine coolant temperature must be 40°C {104°F} or higher.

- The air conditioner is composed of an electrical system as well as a refrigerant system. Because some refrigerant system components require the evacuation of refrigerant gas before replacement, inspect the electrical system first.