Overheating will damage batter-
ies. Do not use coolant heater if
temperature is above -25°F
Carrier batteries can discharge.
Do not operate earner lights,
equipment while coolant heater
4. Press PRESS-TO-TEST switch.
Check that indicator light comes
5. Move RUN-OFF-START switch
to START. Hold switch in
START until indicator light
6. Move RUN-OFF-START switch
to RUN as soon as indicator
light comes on. Do not stop in
7. If coolant heater does not start,
repeat steps 4 and 5 above. If
coolant heater does not start
after three tries, troubleshoot
heater (page 3-15).
Coolant heater always starts at
low heat. It switches to high heat
if HI-LO switch is set at HI.
8. Move HI-LO switch to HI or
When HI-LO switch is at HI,
heater will automatically go to
low heat if coolant temperature
reaches 190°F (88°C). It will go
back to high heat if coolant
drops to 120°F
(49°C). If coolant reaches a
temperature of 245° to 260°F
(118° to 126°C), heater will stop
and must be restarted.