Engine Coolant Heater; Operation - Chevrolet 2011 HHR Owner's Manual

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2. If the engine does not start after 5 10 seconds,
especially in very cold weather (below 0°F
or 18°C), it could be flooded with too much
gasoline. Push the accelerator pedal all the way to
the floor and holding it there as you hold the key in
START for a maximum of 15 seconds. Wait at least
15 seconds between each try, to allow the cranking
motor to cool. When the engine starts, let go of the
key and accelerator. If the vehicle starts briefly but
then stops again, repeat the procedure. This clears
the extra gasoline from the engine. Do not race the
engine immediately after starting it. Operate the
engine and transmission gently until the oil warms
up and lubricates all moving parts.
The engine coolant heater can provide easier starting
and better fuel economy during engine warm up in
cold weather condition at or below 18°C (0°F).
Vehicles with an engine coolant heater should be
plugged in at least four hours before starting. An
internal thermostat in the plug-end of the cord may
exist which will prevent engine coolant heater operation
at temperatures above 18°C (0°F).
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