Overview
This document contains information on:
General
Function requirements
Function
General
The function "residual heat" is only available on vehicles with at least one of the following equipment items:
Climate control with at least 2 temperature zones
Pre-installation for taxi/rental car
Alternative drive
It enables the vehicle to be heated for a certain period of time even after the ignition is switched off. To this end, the residual heat of the combustion engine is directed into the vehicle interior. The residual heat utilization function is controlled by the climate control control system.
Function requirements
Climate control switched on
Engine switched off
Function
After switching on the residual heat utilization function on the air conditioning control panel, the coolant circulation pump is switched on. This routes the coolant which is still warm (residual heat) through the heater core. In addition, the blower motor is actuated at the lowest stage. The air drawn in by the blower motor flows through the heater core and warms up there. The warm air flow now flows to the respective air outlets.
The residual heat utilization function switches off after approx. 30 min or when the on-board electrical system voltage drops below a certain value.