Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

Pressures, checking on vehicles
Página 22 de 33
low" , note the following: If
malfunctioning, evaporator may
ice-up or cooling output is not
reached.
- With this malfunction, evaporator
may ice up although quantity of
refrigerant in circuit is OK.
- Check measured values of
Evaporator Vent Temperature
Sensor G263 .
- Check activation of A/C
Compressor Regulator Valve
N280
Repair Manual, Heating & Air
Conditioning, Repair Group 87 ,
Possible deviation from
specification
Possible cause
Corrective action
- High pressure normal or too high
- Low pressure too high (see
graph),
- Compressor noise (particularly
after switch-on)
- Required cooling output is not
attained.
- Too much refrigerant in circuit - Extract refrigerant from
refrigerant circuit.
- If quantity of refrigerant extrac
roughly corresponds to specifie
capacity:
- Replace A/C compressor.
- If quantity of refrigerant extrac
is substantially greater than
specified capacity:
- Re-charge refrigerant circuit.
- Repeat test.
- High and low pressure normal
- Required cooling output is not
attained.
- Too much refrigerant in circuit - Discharge refrigerant circuit.
- Flush refrigerant circuit with
compressed air and nitrogen.
- High and low pressure normal
- Compressor noise (particularly
after switch-on)
- The required cooling level is
obtained.
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13/2/2005