Heater – Auxiliary Elect Hot Air
Details & Technology
The heater booster consists of radiator elements (fins) which are fitted with PTC (positive
temperature coefficient) resistors and are held together in a mounting frame by spring
clips. When an electric voltage is applied to the heater elements, an electric current flows
through the PTC resistors, which heat up. The fins absorb the heat and radiate it to the
passing air. As soon as the engine is running, the electric heater booster steadily
increases its power from 0 to 100% in the space of 28 seconds.
The heater booster is situated in close proximity to the air outlets, to keep heat losses to
a minimum. The warmed air is circulated into the interior via the vehicle heater/blower
system
Switch-on conditions:
Coolant temp. < 80 °C [176°F] and ambient temp. < 10 °C [50°F].
Switch-off conditions:
Coolant temp. > 80 °C [176°F] and ambient temp. > 13 °C [55°F]
Benefits & Arguments
Aids quick defrosting of the windows
Quick defogging
Quicker warming of the interior
Environmentally friendly, robust, long service life
The electric PTC heater booster is environmentally friendly, since no emissions are
generated. Despite its lightweight, compact design it is robust, has a long service life and
is highly efficient The PTC resistor has self-regulating properties that prevent overheating.
The heater booster accelerates defrosting of windows and counteracts window fogging. It
provides faster heating of the interior and improves comfort on cold days.
Remarks
©2015 Mercedes-Benz USA, LLC / Daimler Vans USA, LLC
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