1 - Damper with low pressure service valve*
In refrigerant hose from expansion valve to compressor.
Only use Kent Moore ACR 4 or equivalent
2 - Refrigerant hose*
From expansion valve to compressor
With damper
3 - Refrigerant pipe*
From receiver dryer to expansion valve
4 - High pressure service valve*
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Manual A/C System Components in Engine Compartment, Servicing
Only use Kent Moore ACR 4 or equivalent
5 A/C Pressure Switch F129 or High Pressure Sensor G65
Switch/sensor can be removed without discharging refrigerant system.
Tightening torque 8 Nm (71 in. lb)
Always replace O-ring.
F129 electrical checking
F129 functional checks
G65 checking
F129 and G65 can also be checked using VAS 5051/5052 in mode "Guided Fault
Finding" .
G65 is monitored by OBD of ECM.
Function:
F129 switches coolant fan V7 to the next higher speed when pressure increases in
refrigerant circuit.
F129 switches off A/C clutch whenever excessive refrigerant system pressure is present
(eg.: insufficient air flow over condensor or if system is overcharged).
F129 switches off A/C clutch whenever insufficient refrigerant system pressure is
present (e.g.: refrigerant has leaked out).
G65 supplies refrigerant system pressure signal to coolant fan control module J293 and
engine control module.
Free Download 1999-2006 Volkswagen A4 Heating, Ventilation and Air Conditioning 87 - Manual A-C System
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