Sprinter 906
H12
Fuel-fired pre-heater/booster (17,000 BTU)
Details & Technology
A fuel-powered (5 kW [17,000 BTU]) auxiliary heater is mounted underneath the floor in
the area of the left-hand B-pillar. The auxiliary pre-heater warms the coolant and can be
used in cold climates to preheat the engine. The pre-heater is turned on and programmed
via a rocker switch in the instrument cluster, optional remote controller HY1 or with the
steering-wheel buttons.
While used as a booster, with the engine running, the increase in coolant temperature
heats the driver section via the water circuit of the front-end heater. The air is supplied to
the interior through the existing air outlets in the instrument panel or optionally H00 and
H13.
Maximum operating time is 60 minutes, at which point the heater switches off
automatically. When the engine is running, the auxiliary heater can be used as a heater
booster, supplementing the front-end heater.
When the aux heating mode turns off, the heater automatically switches to booster mode.
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