Volkswagen Golf 1999 Service Manual page 3885

A/C refrigerant system, servicing
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A/C pressure switch -F129-, checking
Notes:
The presence of -F129- is engine dependant.
Where -F129- is not used, high pressure sensor
-G65- is used instead
Always confirm system use of either -F129
G65- and applicable wiring circuit using
applicable "Engine" and "Air conditioning"
wiring diagrams.
The pressure switch can be removed without
discharging refrigerant system.
- Visually check that O-ring 10,8 mm x 1,8 mm is
positioned correctly in the groove.
Switch part between terminals 1 and 2 switches off
the A/C clutch -N25- when the system pressure is
too high or when there is not enough refrigerant in
the system .
Switch opens when the pressure is below 1.2
bar and closes again above 2.4 bar (switch
point).
Switch opens above 32 bar and closes again
below 24 bar (switch point).
Switch part between terminals 3 and 4 switches
coolant fan -V7- (via the coolant fan control module
-J293-) to the next higher fan speed when system
pressures increase.
Switch closes above 16 bar and opens again
below 12.5 bar (switch point).
Página 16 de 51
87-100
Page 87-85 .
13/2/2005