Porsche P-80 2005, Manual

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Page 5.4
Climate Control Systems Diagnosis & Repair
A/C Refrigerant System Service & Diagnosis
Manifold Gauge Set
The port under the low side gauge connects the low side
service hose to the low side service connection on the
system. The low side service hose is always blue.
The port under the high side gauge similarly connects the
high side service hose to the high side service connection
on the system. The high side service hose is always red.
The center port on the manifold can be connected to
either the red high side or blue low side service hoses
when the respective hand valve is opened. The hand
valves are opened ONLY when recovering,
evacuating or recharging refrigerant from a system.
Otherwise, the hand valves must be closed.
Both high and low side gauges read system pressures
with the hand valves on the manifold closed. A/C service
stations have similar gauges and hand valves. They may
appear different but in most cases they work the same
way.
Service hoses for R-134a systems have quick connectors
and check valves to minimize refrigerant loss when
connecting and disconnecting the hoses. Some hose
connectors automatically depress the service port check
valve pin. Other hose connectors have a knob which must
be screwed clockwise after the hose is connected to
manually depress the service port check valve pin.
Service Ports on the Vehicle
The red and blue service hoses mate with the A/C refrig-
erant service ports on the vehicle. The high side and low
side service port fitting quick connectors are different to
prevent reversing the hose connections.
The service port fittings have spring loaded check valves
to prevent the loss of refrigerant. Dust caps keep the
ports clean and are a secondary seal against refrigerant
loss.
For service port locations on the different models, see the
individual model sections (Cayenne service ports shown
above).
Notes: