Temperature Control

Function
The temperature set on the temperature setting push buttons on the pushbutton control module is achieved or held constant by:
- cooling by means of the evaporator
- heating by means of the heater core
- cooling and reheating (reheat mode)

Heating
The heater core heats up the air flowing through on the way through the air ducts into the vehicle passenger compartment. The heat given up by the heater core is regulated by the monovalve controlling the quantity of heated coolant flowing through.
The monovalve is controlled by the pushbutton control module.

Cooling
The expansion valve on the evaporator causes the liquid refrigerant under high pressure to expand reducing the pressure. The refrigerant then evaporates. The heat required for evaporation is taken from the air flowing through the evaporator. After cooling in this manner, the air flows through the air ducts into the vehicle passenger compartment.

Reheat mode
The air cooled and dried by the evaporator is reheated in the heater core. This prevents the windows from fogging up on the inside.

Temperature control with soft top opened
To prevent extreme reactions of the temperature control when driving with the soft top opened, the exit temperature from the nozzles is regulated only in relation to the temperature set on the automatic air conditioning pushbutton control module and the temperature measured by the outdoor air temperature sensor. The interior air temperature sensor is set to a fixed value of approx. 22 °C for this purpose.

A difference of > 30 °C must be present between the temperature set on the automatic air conditioning pushbutton control module and the temperature measured by the outdoor temperature sensor for the system to go to full heating or cooling.