Chevrolet/GMC 2013 DURAMAX Diesel Service Manual Page 34

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Black plate (10,1)
Chevrolet/GMC DURAMAX Diesel Supplement - 2013 - crc - 8/10/12
9-10 Driving and Operating
Fuel Operated
Heater (FOH)
If the vehicle includes an FOH, it 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.
The FOH will turn on if all of the
following conditions exist:
.
Outside air temperature is below
or equal to 4°C (39°F).
.
Fuel level is greater or equal to
12.5% of the total fuel tank
volume.
.
The engine is running.
.
Coolant temperature is less than
75°C (167°F).
Parking over Things
That Burn
{
WARNING
Things that can burn could touch
hot exhaust parts under the
vehicle and ignite. Do not park
over papers, leaves, dry grass,
or other things that can burn.
Diesel Particulate
Filter
The vehicle has a Diesel Particulate
Filter (DPF) as part of the exhaust
system to reduce vehicle emissions.
The DPF requires a unique exhaust
tailpipe with an exhaust cooler. The
exhaust cooler mixes air with the
exhaust to lower the temperature
before it leaves the tailpipe.
The DPF, the tailpipe, or other
exhaust system components must
not be altered. Inspect regularly and
clean any mud or dirt from the
exhaust cooler, especially where the
exhaust cooler connects to the
tailpipe and the openings where
fresh air enters the cooler. See
Exhaust System Inspection under
Maintenance Schedule on
page 113.
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