412-00-49 Climate Control System — General Information 412-00-49
GENERAL PROCEDURES (CONTINUED)
4. NOTE: If an air conditioning system is
evacuated before the refrigerant has been
drained, some of the refrigerant will remain in
the compressor refrigerant oil. This remaining
refrigerant may evaporate, causing a slight
increase (maximum two marks) in the reading
on the pressure gauge during the leak test.
This increase in pressure does not mean the
air conditioning system is leaking.
Carry out a leak test.
• To test for leaks, close the hand valves
on the pressure gauge head, switch off
the service unit vacuum pump and
observe the low-pressure gauge.
• If the reading increases by more than 20
mbar (2 kPa), this means that the system
is leaking.
• If the air conditioning system is leaking,
fill it with approximately 300 g refrigerant
and check using a leakage detector.
For additional information,
refer to Leak test in this section
CAUTION: Always evacuate the air con-
ditioning system before filling it.
NOTE: Depending on the service unit and
equipment (with or without heatable filler cylin-
der), the air conditioning system can be filled in
liquid form through the high-pressure port or in
gaseous form through the low-pressure port.
NOTE: Fill quantity indicated on sticker in en-
gine compartment.
5. Filling the air conditioning system through
the high-pressure port (liquid fill).
• Open the high-pressure shut-off valve on
the pressure gauge head.
• Switch the service unit to "Fill" mode and
fill the system with the prescribed quantity
of liquid refrigerant (R134a).
E6815 EN 07/2001 2002 Bantam
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