TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 412 of 1275

TM9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

ac. WINTERIZATION KIT CIRCUIT

The winterization kit consists of a coolant heater (blower motor, flame detector switch, overheat thermostat, restriction

thermostat, resistor igniter, fuel control valve, shutoff solenoid, and restriction solenoid), coolant pump, fuel pump, and

control box. The diagram below shows the relationship of these components.

The winterization kit works whether the MASTER switch is ON or OFF. Placing the START/OFF/RUN switch in START

position energizes the coolant heater and causes the indicator on the control box to illuminate. Placing the START/OFF/

RUN switch in the RUN position energizes the coolant pump and blower motor, causing the coolant to be circulated

through the engine and battery compartment.

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