charging AUDI A4 1999 B5 / 1.G Refrigerant System Components Workshop Manual

87-22

Valve connections for pressure
switches


A Schrader valve is installed under A/C system pressure switches to allow
replacement without discharging the refrigerant system.
Note:
A/C system switches are available in different versions. Always refer to
the latest parts information to ensure correct switch application. - A/C system low and high pressure switches use different size threads.
- Use only the correct switches and O-ring seals specified for use with R-
134a refrigerant and PAG oil.
A - Switch connection (soldered)
B - O-ring seal
C - Schrader valve insert
Pa
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87-26

High pressure service valve assembly


Notes: A - Service valve connection (located on condenser inlet line)
B - Schrader valve insert
C - O-ring seal
D - Cap with seal
Only a high pressure service valve is used for A/C system servicing. A
low pressure service valve is not installed in the A/C system. Perform
all A/C system service operations (i.e discharging, evacuating, and
charging) through the high pressure service valve only. Use only the specified R-134a quick coupling connectors when
servicing the refrigerant system. Before removing the valve insert from the high pressure service valve,
discharge refrigerant system page 87
-201
.
Always reinstall cap -D- over service valve.Illustration shows the condenser from an Audi 100 model.
Pa
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