Porsche P-80 2005, Manual

Page: 38 / 108

Page 3.4
Climate Control Systems Diagnosis & Repair
Sports Cars System
Refrigerant System Description
Compressor
The A/C compressor is a continuously variable 7-cylinder
swash plate design. An internal mechanical regulating
valve varies compressor displacement by changing
pressure in the crankcase under the pistons. The
regulating valve senses changes in refrigerant high side
and low side pressures. These pressures are an indication
of heat load: high displacement for high heat load, low
displacement for low heat load. The compressor displace-
ment is 160 cm
3 (9.8 in 3 ) at 100% output. Output can be
as low as approx. 5%.
Condensers
Two A/C condensers are used on the 911 Carrera
(996)/(997) and Boxster (986)/(987) models. They are
mounted in the front of the vehicle on the left and right-
hand sides in front of the engine coolant radiators. Each
condenser is cooled by the electric cooling fan to ensure
sufficient airflow and heat transfer under all driving condi-
tions. Refrigerant flows through the right side condenser
first, then the left.
Receiver Drier
The refrigerant tank is installed in the fresh air chamber at
front left, next to the battery. The pressure relief valve (see
arrow) for the refrigerant system is also located here.