Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

General information on refrigerant circuit
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General information on refrigerant
circuit
Components of refrigerant circuit
- All components of the refrigerant circuit submitted for
quality observation are always to be sealed (use original
sealing caps of replacement part).
- Replace damaged or leaking components of refrigerant
circuit 00-8, Components, replacing .
- To date, the following replacement parts (compressor,
reservoir, receiver, evaporator and condenser) have been
filled with nitrogen gas. This charge is being gradually
discontinued. Little or no pressure equalization is therefore
noticeable on unscrewing sealing plugs from replacement
parts.
Arrangement of refrigerant circuit components
and their influence on high and low pressure
sides
On high pressure side are the condenser, receiver and
restrictor or expansion valve to separate the high and low
pressure liquid sides.
High pressure results from the restrictor or expansion valve
forming a constriction and causing the refrigerant to
accumulate, thus leading to an increase in pressure and
temperature.
Excess pressure occurs if too much refrigerant or
refrigerant oil is used, the condenser is contaminated, the
radiator fan is malfunctioning, the system is blocked or in
the event of moisture in the refrigerant circuit (icing-up of
restrictor or expansion valve).
On low pressure side are the evaporator, reservoir,
evaporator temperature sensor and compressor to
separate high and low pressure gas sides
A drop in system pressure can be caused by loss of
refrigerant, the restrictor or expansion valve (no
constriction), a malfunctioning A/C compressor or an icedup
evaporator.
A/C compressor with A/C clutch
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13/2/2005