Porsche P-80 2005, Руководство пользователя

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Page 3.8
Climate Control Systems Diagnosis & Repair
Sports Cars System
Particle Filter
A particle filter is installed in the fresh air inlet on the right
side of the cowl. All fresh air passes through this filter. An
optional charcoal filter can also be installed. The filter
removes airborne matter, and the optional charcoal filter
also absorbs pollutants and odors. The filter should be
replaced during specified service intervals.
Ventilation
In the Boxster (986)/(987), the ventilation system for the
passenger compartment also modifies the temperature of
the rear trunk, as interior air is constantly ventilated to the
outside through the trunk. Air exits the passenger
compartment through vents in the rear deck into the trunk.
Vents in the sides of the trunk allow air to exit through one-
way flaps.
911 Carrera (996)/(997) models expel air forwards
through passages in the side sills, through one-way flaps
exiting into the front wheel wells. The front wheel wells act
as low pressure areas while driving, and increase airflow
out of the vehicle.
A/C Control Unit Function – 911 Carrera (996) &
Boxster (986)
Automatic climate control was standard equipment on 911
Carrera (996) and Boxster (986) models sold in the United
States. The system automatically maintains temperatures
between 18-29° C (64-84° F) (with 22° C (72° F)
recommended).
The A/C Control Unit is located in the dash and has the
passenger’s controls. In automatic operation, the system
determines and controls blower speed, outlet air tempera-
ture, and outlet selection. The automatic climate control
system also permits manual selection of temperature and
air distribution if desired.
A A/C Control Unit contains an electronic processor which
receives inputs from sensors and provides outputs to
control actuators. Sensor input information includes outlet
air temperature and passenger compartment air tempera-
ture. The passenger compartment air temperature value is
compared with the passenger-selected value. If the two
values are different, the A/C Control Unit commands
electric servo motors to move air distribution flaps to
change the outlet air temperature.
The A/C Control Unit communicates with the DME. It is the
DME that actually commands the A/C compressor clutch
ON and OFF. The instrument cluster communicates with
the A/C Control Unit by means of a serial interface (2000
and earlier) or Bus (2001 on).
Notes: