
Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336155) - 2020 - CRC - 5/6/19
Driving and Operating
23
Warning (Continued)
vehicle. Possible heater
cord and thermostat
damage could occur.
.
While in use, do not let the
heater cord touch vehicle
parts or sharp edges. Never
close the hood on the
heater cord.
.
Before starting the vehicle,
unplug the cord, reattach
the cover to the plug, and
securely fasten the cord.
Keep the cord away from
any moving parts.
5. Before starting the engine, be
sure to unplug and store the
cord as it was before to keep it
away from moving engine parts
and prevent damage.
The length of time the heater should
remain plugged in depends on the
outside temperature. You may wish
to use the coolant heater to improve
ease of starting at temperatures
between
−
18 °C (0 °F) and
−
29 °C (
−
20 °F). Keep the coolant
heater plugged in for a minimum of
four hours. At temperatures below
−
29 °C (
−
20 °F), the coolant heater
should remain plugged in for at least
eight hours. Be sure to store the
cord before starting the engine. See
for
information on what fuel to use in
cold weather.
Caution
Do not use the engine heater
continuously. This could damage
the engine heater and may cause
a fire. Always unplug the engine
heater after use.
Fuel Operated Heater
(FOH) (Van Models Only)
If equipped, the FOH will enhance
heater performance and will reduce
the amount of time it takes to warm
the inside of the vehicle in cold
conditions below or equal to 4 °C
(39 °F).
The FOH is installed on the frame
rail on the driver side of the vehicle
and uses diesel fuel to heat the
engine coolant, which warms up the
passenger cabin air.