Volkswagen Golf Service & Repair Manual: Distribution of the refrigerant circuit components and their influence on
the high-pressure and low-pressure sides
| On the high-pressure side, there are the condenser, the
receiver and the restrictor or expansion valve that acts as the
separation between the high-pressure fluid and low-pressure
fluid sides. |
| High pressure is created because the restrictor or expansion
valve forms a restriction and holds back the refrigerant,
leading to increased pressure and temperature. |
| Excessive pressure results if the circuit is filled with too
much refrigerant or refrigerant oil, or the condenser is dirty,
the radiator fan is defective, there is a blockage in the system
or there is moisture in the refrigerant circuit (causing the
restrictor or expansion valve to ice up). |
| On the low-pressure side, there are the evaporator, the
reservoir, the temperature sensor for the evaporator and the air
conditioner compressor that acts as the separation between the
high-pressure and low-pressure gas sides. |
| A loss of pressure in the system can be due to loss of
refrigerant, restrictor or expansion valve failure (not creating
a restriction), defective air conditioner compressor or an
iced-up evaporator. |
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Caution
Non-authorised tools or materials (e.g. leak
inhibitor additive) may cause damage or adversely
influence t ...
The air conditioner compressor is driven by a V-belt from
the engine.
An electromagnetic clutch is fitted to the air conditioner
compressor. Wh ...
Other materials:
Removing the Maintenance Panel
To check fluid levels, remove the maintenance panel:
1. Open the hood.
2. Pull the maintenance panel upward to release the
clips that hold it in place.
CAUTION: The maintenance panel protects the
front trunk from water. When re-attaching, make
sure it is fully seated.
Checking Battery Coolant
Y ...
Retrofitting refrigerant circuit from R12 refrigerant to R134a refrigerant
Chlorofluorocarbon (CFC) is no longer used as a refrigerant
in the automotive sector.
R12Converting refrigerant circuits from refrigerant R12 to
refrigerant R134a and repairing the converted circuits.
→ Repair ...
Deactivating APP function of wiper motor
The windscreen wiper system is equipped with an APP function
(alternating park position).
With the APP function, the wiper is moved up slightly once
it has reached the lowest position. This occurs every second
time the wiper system is sw ...
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Refrigerant circuit components
Air conditioning system compressor with magnetic clutch