Volkswagen Golf 1999 Service Manual page 4046

Pressures, checking on vehicles
- With this malfunction, evaporator
may ice up although quantity of
refrigerant in circuit is OK.
Possible deviation from
specification
- High and low pressure normal
- Required cooling output is not
attained.
- High and low pressure normal
- Compressor noise (particularly
after switch-on)
- The required cooling level is
obtained.
Note:
- Overfilling with refrigerant oil can
occur if, for example, the
compressor has been replaced
without adjusting the quantity of
refrigerant oil.
Expansion valve and
receiver (without
internally regulated
compressor), checking
Test requirements
- Radiator and condenser clean
(clean if necessary)
- Ribbed belt for A/C compressor
and generator is correctly
tensioned.
- All air ducts, covers and seals
OK and properly installed
- Flaps reach their end positions.
- Engine at normal operating
temperature
- Evaporator and heater not
drawing in secondary air at
maximum fresh-air blower speed.
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Next&type=repair&id=...
Possible cause
Too much
- Discharge refrigerant circuit.
refrigerant in
circuit
- Flush refrigerant circuit with
compressed air and nitrogen.
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Corrective action
13/2/2005