412-00-47 Climate Control System — General Information 412-00-47
GENERAL PROCEDURES
Vacuum Leak Detection (34 620 5)
Special Tool(s)
R-134a refrigerant station or
equivalent equipment
023-00106
Special Tool(s)
Refrigerant identifier or
equivalent equipment
198-0003
WARNING: Observe “Health and Safety
Precautions„.
CAUTION: The refrigerant identifier must
be used before the system is evacuated,
otherwise the service station may be-
come contaminated. Contaminated re-
frigerant must be disposed of as special
waste. The manufacturer's instructions
must be followed when dealing with the
service station.
1. Empty the air conditioning system under
suction and evacuate it. For additional
information, refer to Air Conditioning -
drain, evacuate and re-fill in this section.
2. NOTE: If an air conditioning system that was
filled with refrigerant is being evacuated, then
some refrigerant will still be in the refrigerant
oil in the compressor. This residual amount of
refrigerant may still evaporate and during the
leak test may result in a minor increase on
the pressure gauge (max. two sub-divisions).
However, despite this pressure increase the
air conditioning system is free from leaks.
Carry out the leak test.
• Close the gauge head manual valves.
• Switch off the service station vacuum
pump.
• Watch the low pressure gauge on the
service station. If the gauge reading
increases by more than 20 mbar (2 kPa),
the system is leaking.
• If there are leaks, fill the air conditioning
system with approx. 300 g of refrigerant
and check it using leak testing equipment.
For additional information,
refer to Leak testing in this section
• If the system is free of leaks, continue
with the filling procedure.
E3639 EN 07/2001 2002 Bantam
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