Climate Control

87 Climate Control

All Cayenne Models have standard air conditioning that operates with the environmentally friendly refrigerant R134a. The following varieties of Climate Control are available:
- 2 zone Climate Control (Cayenne S series and Cayenne Turbo)
- 4 zone Climate Control (optional for all models)

2-Zone Climate Control

Functionality

With 2 zone Climate Control, the temperature for the driver and the passenger can be set separately and the volume of air (fan) for each side are the same.

The two buttons are used on the edge of the control/button panel. The button panel is under a hinged covering. The outside buttons controls the fan speed. This is the same for the right and left side. The buttons on the inside control the temperature separately for the passenger and the driver.

An auto button is integrated in the control panel for the Climate Control - in the button bar over the liquid crystal display - that can switch on automatic operation. An LED in the button confirms that automatic operation is on. Depending on various factors (for example, amount of sun light, external temperature, air quality, etc.) the Climate Control will automatically control the chosen internal temperature.

If the volume of air is turned down so far that the display shows "OFF" the flow of air will be stopped because the fan is off. The temperature mixing valves will also close.

The internal temperature can be anywhere between 16 degrees C to 29.5 degrees C or 61 F to 85 degrees F. If a lower or higher temperature is set the display will show the words "LO" or "HI". The climate control is now operating at maximum cooling or heating capacity. Automatic operation is turned off and circulating air is activated.

After the vehicle is turned off, the 2 zone Climate Control has an extra button that will use heat left in the heater core to further heat the passenger area for a maximum of 20 minutes. This is displayed with the word "REST".

Should the outside air quality become extremely bad, one can manually switch over to circulating air. There is also an air quality sensor located in the external air 6ntrance duct that has standard values for "automatic switch to recirculation air" (AUTO Recirculation Switch). Based on these standard values. if the air becomes worse (exhaust gases). the recirculation air will be automatically switched on.

Operation (2 Zone Climate Control)







The following functions can be shown in the liquid crystal display:
- Individual temperature for left and right side
- Air volume (fan setting) for the left and right side
- Air distribution for the left and right side (symbol for air distribution shows only in the left side display)
- Time synchronized to the PCM/instrument cluster
- OFF (word only displayed on the left side)

The following section details various operating features:

A - Defrost Front Windshield
a. If the button is pressed once, the air conditioning comes on (intake temperature > 3 degrees C) and if selected, recirculation air is used. The flap motor for the distributor flap for defrost directs all air to the windows (mainly the front windshield) and the fan runs at maximum level (triggering at 12 Volts). The fan level can be manually controlled with both buttons.

The defrost function changes all previously active settings. They are, however, saved and can be activated by pressing the button "A" (deactivate the defrost function).

B - Defrost Rear Window
a. The length of time that the rear window defrost runs depends on the external temperature. At a temperature between 4 degrees C and 10 degrees C, the maximum heating time is about 16 minutes. After this time frame, the defrost will automatically shut off. When the temperature is over 10 degrees C, the defroster is not active.

C - Auto Button (Automatic Operation)
a. If the auto button is pushed - the integrated diode will light up - the air volume (fan), the air distribution and the individual temperature for the driver and passenger will be controlled. If something is manually changed with regards to the air volume or the air distribution setting, automatic operation will no longer function.
b. If the auto button is held down for 2 seconds or longer, the temperature choice of the driver will also be used for the passenger zone. At this point the temperature on the driver side is then changed, this will also change for the passenger side.

D - Auto Circulating Air Circulating Air
a. The button for circulating air must be pressed once - the right integrated diode will light up in order to select automatic circulating air. The external air flow will be controlled depending on the air quality.
b. If the button for circulating air is pressed two times - the left integrated diode lights up - the operating mode (manual) circulating air is active and only internal air will be recycled. To deactivate, push the button again.

If the AC compressor is manually or automatically turned off, recirculation air operation will end after about 3 minutes. This will avoid fogging of the windows (for the country code "JAPAN" circulating air remains on).

N - ECON Button (AC Compressor On/Off)
a. If the ECON button is pressed - the display shows the word "ECON"- the AC compressor will turn off. In Economy operation no cooling under the external temperature is possible. By pushing the button again the compressor will be turned on - for external temperatures over about 2 degrees C

The climate compressor will be automatically turned off at external temperatures under 2 degrees C and cannot he turned on manually by pushing the Auto button.

U - REST Button (Residual Heat from the Motor for Vehicles with 2 Zone Climate Control)
a. After the vehicle is turned off and the REST button is pushed, residual heat from the motor can be used for a maximum of about 20 minutes to heat the inside of the vehicle. The display shows the word "REST". If the REST operation is not turned on unit 15 minutes after the ignition is turned off, only the 5 minutes left will be available. The settings of the climate control cannot be changed in REST operation. By pushing the REST button again, the function is shut off.

In REST operation the temperature and air distribution will continue as closely as possible to the previous settings. The controller will thus open the temperature valves more and more as the cooling agent cools down. At the same time the fan will decrease the air volume (PWM signal). During REST operation the electronic water pump will be triggered.
It the battery is running low, REST operation will not be possible.

Cold Air Circulation (2 Zone Climate Control)

The cold air circulation in the Cayenne is set up so that the compressor and the expansion valve are the classic separations between high and low pressure sides.







The following sections/components are built in and shown in the direction of the cold air circulation:
1. Compressor (front side of the motor)
2. Condenser (sandwich design with radiator)
3. Receptacle (line) for the drying cartridge (replaceable cartridges integrated on the right outside of the condenser)
4. Service connection (high pressure)
5. Pressure sensor on the high pressure side
6. Expansion valve (flow)
7. Evaporator (evaporator cannot be seen in diagram)
8. Expansion valve (return)
9. Service connection (low pressure)
10. Pressure damper (low pressure side right in front of the compressor near the left wheel housing).