18                                                      TM5-2430-200-10 Operation Section Monitoring Systems and Cab Features Engine Coolant Heater Switch NOTE:    The engine coolant heater switch is always installed on the machine. If the machine is equipped   with the optional arctic starting system, the engine   coolant heater switch is functional. If the machine is   not equipped with the optional arctic starting system,   the engine coolant heater switch is not functional. Do   not   operate   the   engine   coolant   heater   in   an enclosed   area.   The   heater   produces  combustion gases    which    may    be    harmful    to    your    health.   Always   start   and   operate   the   heater   in   a   well- ventilated area and, if in an enclosed area, vent the exhaust to the outside. Improper   use   of   the   engine   coolant   heater   can   create a fire or cause an explosion. Do not operate the   engine   coolant   heater   while   the   machine   is   being refueled. Do not place combustible materials within 50.8 mm (2 in) of the coolant exhaust system located  just  inside  the  left  track  under  the  Main Disconnect Switch Box. Press switch (6) down to turn the engine heater ON.   Press the switch again to raise the switch and turn the engine heater OFF. An internal light in the switch will illuminate to indicate that the heater is functioning.   After the switch has been turned off, the light will   continue to illuminate until the coolant heater has completed a three-minute shut-down procedure. NOTICE Do  not  start  the  engine  while  the  light  in  the  engine   coolant heater switch is on. The engine coolant heater requires three minutes  to purge itself of diesel fumes. Damage to the engine coolant heater may result if the engine is started too soon after use. NOTICE Do not operate the engine coolant heater if the coolant   is frozen. START-AID SWITCH Lift switch cover (7) to access the switch. Start-Aid Switch (8)--Move the switch up and hold it for three or more seconds, and then release it. Depending on the temperature of the intake air and engine coolant, a premeasured   amount of ether is injected into the engine air intake manifold. When the start-aid system is functioning and the blackout light switch is in STOP LIGHT or   SERVICE DRIVE, the start-aid indicator will turn on. NOTICE Use  the  ether  sparingly.  Excessive  ether  can  cause   piston and ring damage. Do not inject ether unless the engine is rotating. NOTE:    The electronic control module (ECM) will allow the manual injection of ether if the intake air   temperature is below  0⁰C (32⁰F), the engine coolant temperature is below  40⁰C (104⁰F), and the engine speed is below 1000 rpm. NOTE:    The ECM automatically turns on the engine intake air heater to assist in starting the engine, depending on the air temperature and the engine   coolant temperature. It is permissible to manually   inject ether using the start-aid switch when the intake   air heater is turned on.