Ferrari California, Workshop Manual

Page: 1654 / 1727

F5.01 Air conditioning and heating system layout
System overview
The air conditioning and heating system automatically regulates the temperature and humidity in the
passenger compartment. The system can simultaneously and independently regulate air temperature and
distribution for the driver side zone and passenger side zone.
The A.C. system consists of a heating, ventilation and air conditioning unit (HVAC) located under the
dashboard.
The passenger compartment is split longitudinally into two temperature zones:
driver zone;
passenger zone.
The dual zone regulation system regulates the following parameters:
passenger compartment air temperature in driver zone;
air distribution via vents in driver zone;
passenger compartment air temperature in passenger zone;
air distribution via vents in passenger zone;
ventilation with external air or recirculating air in passenger compartment;
fan speed.
Functional requisites
The functions of the HVAC module, located under the dashboard, consist in aspirating air through heat
exchanger either from outside the vehicle or from inside (REC function) and in continuously adjusting the
quantity and temperature of the distributed air.
The air introduced into the vehicle must be filtered to remove particulate and odours in both external air and
REC modes.
The air temperature is regulated by altering the flow of refrigerant through the heater core in two symmetrical
crossed circuits, with one on the left-hand side and one on the right-hand side.
Air conditioning and heating system layout
The air conditioning and heating system consists of a heater/evaporator unit (HVAC) controlled by a
microprocessor ECU (integrated in the A.C. control panel) which, in both automatic and manual mode,
maintains constant temperature within the passenger compartment regardless of external conditions by
regulating the air temperature, distribution and air flow.
The system automatically selects whether to use air from outside the vehicle or air recirculated within the
passenger compartment, independently of ambient conditions.
The R134 A refrigerant is aspirated in gaseous state by the compressor (B) , which sends it to the condenser
(C) at a pressure varying in relation to ambient temperature.
When the refrigerant cools inside the condenser, it condenses and becomes a liquid.
The dehydrator filter, which is built into the radiator assembly, removes all traces of humidity due to water
vapour in the system and acts as a tank for the liquid refrigerant.
A pressure switch (L) in this part of the system measures the pressure and disengages the electromagnetic
clutch when the pressure limit is reached.