Purging (Cleaning) Refrigerant Circuit With Refrigerant R134A - Volkswagen Amarok 2011 Workshop Manual

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
7.1.1 Blowing out refrigerant circuit
Note
On vehicles where no adapters fit the refrigerant pipes, blow
♦
through individual components using an air gun, for example,
with rubber nozzle. When doing this, be particularly careful not
to damage the connections (do not crush or scratch them).
The evaporator should be blown through from the connection
♦
to the low-pressure side (large diameter), with the expansion
valve or restrictor removed.
Always blow through components opposite the direction of re‐
♦
frigerant flow.
Examine the expansion valve; renew if dirty or corroded.
♦
If components bear dark, sticky deposits which cannot be re‐
♦
moved with compressed air, renew these components.
Thin, light grey deposits on the insides of refrigerant pipes do
♦
not impair the function of the components.
After blowing out the system, always renew the receiver or
♦
reservoir and the restrictor. If the condenser has a dryer, re‐
new the dryer cartridge or dryer.
7.2 Purging (cleaning) refrigerant circuit
with refrigerant R134a
Vehicles with high-voltage system (hybrid vehicles)
Observe the additional warning instructions for working on vehi‐
cles with high-voltage system ⇒ Electrical system; Rep. gr. 93 ;
General warning instructions for work on the high-voltage sys‐
tem .
WARNING
Risk of injury due to unexpected engine start
When working on a high-voltage vehicle, switch off the ignition,
and deposit the ignition key somewhere outside the passenger
compartment.
WARNING
Handling high-voltage cables:
• Do not support yourself or your tools on high-voltage ca‐
bles and their components --> risk of damage to the insu‐
lation.
• High-voltage cables must not be extensively bent or
kinked --> risk of damage to the insulation.
• The round high-voltage connectors are colour-coded with
a coloured ring on the outside and mechanically coded
with respective guide lugs. Always observe the coding
when connecting the round high-voltage connectors in or‐
der to prevent any mechanical damage to the high-voltage
connectors.
Air conditioning system with refrigerant R134a - Edition 10.2014
7. Clearing refrigerant circuit of contaminants
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