4. Before starting the engine, be sure to unplug and
store the cord as it was before to keep it away
from moving engine parts. If you don’t, it could
be damaged.
How long should you keep the coolant heater plugged in?
The answer depends on the outside temperature. You
may wish to use your coolant heater to improve ease
of starting at temperatures between 0°F (−18°C)
and −20°F (−29°C).
Keep the coolant heater plugged in for
a minimum of four hours. At temperatures below −20°F
(−29°C), the coolant heater should remain plugged in for
at least eight hours. It will not harm either the coolant
heater or the vehicle to leave the coolant heater plugged
in longer than the times stated. Be sure to remove and
store the cord before starting the engine. See Diesel
Fuel Requirements and Fuel System on page 5-2 for
information on what fuel to use in cold weather.
2-9
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