Auxiliary Heater
8_SH Auxiliary Heater (System-Added Heat)
Functionality
As an option the Cayenne can be equipped with auxiliary heater. This heater uses the heating circulation connected to the cooling system circulation of the motor. This system flow is heated by the auxiliary heater when the vehicle is standing still. A flap (3/2 way flap) closes the heating circulation off from the rest of the cooling system circulation when the auxiliary heater is running, in order to stop a warming up of this. Over the heater core the hot air is directly sent to the inside of the vehicle through the fan. It the vehicle has 4 zone Climate Control, the rear heater core is integrated into the auxiliary heating system.
The necessary fuel needed for combustion is directed to the auxiliary heater or combustion area through a line that is separately connected to the fuel tank. The fuel lines run under the body. The auxiliary heater and all parts belonging to it, for example the circulation pump and the 3/2 way flap, can be found under the front left fender behind the wheel housing (extension of the A column).
The circulation pump, the air intake muffler and the valve are separate units. The muffler minimizes noise during combustion.
The diagram shows the auxiliary heating components with the connection lines for the rear heater core.
The exhaust that is generated during combustion is released on the drivers side near the extension of the A column.
Do not operate auxiliary healer in closed areas (for example garages) duo to danger of poisoning.
Operation (Example System-Added Heater)
The operation and setting of the auxiliary heater takes place over the front control panel of the Climate Control (under the cover in the middle console). When the auxiliary heater is running, the remaining running time is shown on the display (see operating device in next section.
A programmed "turn on" time (in a saved spot) will not be automatically activated. A time must first be selected and activated in order to use the auxiliary heater. This time can be set up to 24 hours previous.
The menu control and the programming of the "turning on" times for the auxiliary heater are described in detail in the operating manual.
Auxiliary heater can be operated independently of the ignition position. It has three independent save positions for the programming of the "turning on" time. Each save position lets the turning on time as well as the functions of the auxiliary heater or auxiliary ventilation be programmed. The necessary fan operation will turn on slightly later in order to avoid flow of cold air, so that only warm air flows into the vehicle. When the auxiliary heater is running, only one save position can be active (that has been programmed and selected).
To set auxiliary heater on the control panel of the Climate Control - you can turn the device on or off with a remote control (only RoW). If the Climate Control panel was used to turn on the auxiliary heat, the heat cannot be turned off using the remote. Setting using the remote is not possible.
When buttons are pushed on the remote, the vehicle must be in sight. A light diode will light up signalizing that the signal is being sent.
The remote control has a range of about 800 m. This range may be shorter depending on possible obstructions.
For more on the topic signal reception of the remote control see the section "Integrated Antenna System".
System Overview for Auxiliary Heater (System Added Heater)
The diagram shows the system overview for the Cayenne Turbo. Status; Auxiliary heat on (heating fans running)
The diagram above shows the wiring plan for the used/warmed heating circulation that is separated by the 3/2 way flap from the cool system circulation The flap is located above the auxiliary heat module and is impinged on, for auxiliary heat function, by the Climate Control module (operating device) over a magnet flap with vacuum pressure.
The following diagram shows the system overview for the Cayenne Turbo Status:
1. Motor residual heat (heating fans running
2. Supports heating capacity (motor and heating fans running)
The entire cooling circulation (motor cooling) is detailed in section "Cooling".
The diagram shows the wiring plan for the use of the residual motor warmth function combined with the optionally equipped auxiliary heater. Jo use the residual warmth function, only the circulation pump is needed. For vehicles without residual heat, positions 3 and 5 are not integrated into the return of the heating circulation (components A to C - for the triggering of the 3/2 way flap - are also no longer needed).