1. Start the engine.
2. Set the mode to the desired position. To improve the effectiveness of heating and cooling :
- Heating:

- Cooling:

3. Set the temperature control to the desired position.
4. Set the air intake control to the outside (fresh) air or recirculated air position.
5. Set the fan speed control to the desired speed.
6. If air conditioning is desired, turn the air conditioning system on.

■ Type A ■ Type B 1. Fan speed control knob 2. Mode selection knob 3. Temperature control knob 4. Air conditioning button (if equipped) 5.
The mode selection knob controls the direction of the air flow through the ventilation system. Air can be directed to the floor, dashboard outlets, or windshield.
Repair procedures Inspection 1. In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (KDS/GDS). The diagnostic system (KDS/GDS) provides the following information. (1) Self diagnosis : Checking failure and code number (DTC)
Description and operation Description The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core. The PTC heater is an electric heater using a PTC element as an auxiliary heating device that supplements deficiency of interior heat source in highly effective diesel engine.