Operator Cab And Controls - Section 32 8/11 OM3232 Page 32-10 HEATER/AIR CONDITIONER COMPARTMENT AND CONTROLS The heater/air conditioner compartment contains heater/air conditioner controls and some of the heater/air conditioner components, such as the blower motor assembly and the heater coil. Optimum cab air climate can be selected by using the following controls in various combinations. Heater/Air Conditioner Vents Heater/air conditioner vents (6, Figure 32-7) may be rotated 360°. There are three vents in the heater/air conditioner compartment, four vents across the top of the instrument panel, and one vent each in the RH and LH instrument panels.
There are also an additional four vents under the instrument panel. Air flow through the vents is controlled by manually opening, closing or turning the louvers. Fan Speed Control Knob Fan speed control knob (1, Figure 32-7) is provided to control the cab air fan motor. The fan motor is a 3- speed motor (low, medium and high). Speeds are selected by rotating the control knob clockwise to the desired position. OFF is in the full counter-clockwise position. The control knob must be switched ON for the air conditioner to function. Temperature Control Knob Temperature control knob (2, Figure 32-7) allows the operator to select a comfortable air temperature.
The control knob determines the operation of the air conditioning and heater modes. Rotating the control knob counter-clockwise (blue zone (3)) will cause the A/C compressor to operate and result in cooler air temperatures. Full counter- clockwise position is the coldest air setting. Rotating the control knob clockwise (red zone (4)) will affect coolant flow through the heater core and result in warmer air temperatures. The full clockwise position is the warmest heater setting. Air Flow Directional Knob Air flow directional knob (5, Figure 32-7) controls the direction of airflow as follows: FIGURE 32-7. A/C & HEATER CONTROLS 1. Fan Speed Control Knob 2. Temperature Control Knob 3.
Blue Zone 4. Red Zone 5. Air Flow Directional Knob 6. Vents Provides airflow to floor vents only. Provides airflow to upper vents and floor vents. (Blue Icon) Provides dehumidified air to the upper vents and the floor vents. Defrost - Provides dehumidified air to the upper vents only. Defrost - Provides dehumidified air to the upper vents and the floor vents.