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On account of the high efficiency of modern, direct injection engines
(e.g. TDI), dissipated heat is no longer sufficient for heating
up the inside of the vehicle quickly on cold days. Efficient units
have been developed especially for these cases. PTC booster
heaters, which are installed in the direction of travel in front of the
heat exchanger, make it possible to heat up the vehicle interior
more quickly. They are made up of several temperature-dependent,
electrically controlled resistors. Energy is taken from the
vehicle wiring system without delay and dissipated into the inside
of the vehicle directly as heat via the blower air flow.
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