General Information On Refrigerant Circuit; Refrigerant Circuit Components - Volkswagen Amarok 2011 Workshop Manual

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
2 General information on refrigerant
circuit
2.1

Refrigerant circuit components

Caution
Non-authorised tools or materials (e.g. leak inhibitor additive)
may cause damage or adversely influence the system.
Only tools and materials approved by the manufacturer may
be used.
Use of non-approved tools or materials will render the warranty
void.
• All components of the refrigerant circuit that were submitted
for quality monitoring must always be sealed (use the original
sealing caps from the genuine part).
• Renew damaged or leaky components of the refrigerant circuit
⇒ page 159 .
• The genuine parts (air conditioner compressor, reservoir, re‐
ceiver, evaporator and condenser) are charged with nitrogen
before shipment. This filling is being gradually discontinued.
Therefore, when the sealing plugs are unscrewed from the
genuine part little or no pressure equalisation is noticeable.
2.1.1 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 re‐
frigerant 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 expan‐
sion 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-pres‐
sure 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.
Air conditioning system with refrigerant R134a - Edition 10.2014

2. General information on refrigerant circuit

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