BODY AND CHASSIS ACCESSORY ITEMS MAINTENANCE
Section I. DESCRIPTION AND DATA
15-1. MAINTENANCE TASK SUMMARY.
This chapter covers maintenance procedures for the cab heater, as well as a functional description of the cab heater.
15-2. DESCRIPTION AND DATA.
Heater. The heater is located beneath the operators seat in the cab. Engine coolant is supplied to the heater core
through flexible hoses. A pair of blowers draw air through the heater core where it extracts heat and discharges
the heated air along the floor of the cab.
Heater Controls. A manually operated valve located in the coolant supply line controls heating capacity of the
heater by regulating the flow of coolant to the heater core. This valve can be fully closed to completely shut off
coolant flow to the heater core. Control of this valve is by means of a push-pull knob located on the side console.
Pulling up on the knob increases the heater temperature setting. Pushing down on the knob decreases the heater
A three-position switch, also located on the side console, controls heater blower speed. LOW position of the
switch produces the slowest blower speed and HIGH position produces the highest blower speed. The OFF
position removes power from the heater blower motor and the motor shuts off.
Section II. BODY AND CHASSIS ACCESSORY ITEMS MAINTENANCE PROCEDURES
BODY AND CHASSIS ACCESSORY ITEMS MAINTENANCE TASK SUMMARY
24V Heater Assembly - Repair