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

Pressures, checking on vehicles
Página 33 de 33
high pressure may also not
increase or only increase slightly
due to the absence of energy
conversion.
Possible deviation from
specification
- High and low pressure normal.
- Required cooling output is not
attained.
Possible cause
- Activation of A/C Compressor
Regulator Valve N280
malfunctioning.
- Too much refrigerant in circuit
Corrective action
- Check activation of
Compressor Regulator Valve
N280 .
- 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.
- Too much refrigerant in circuit - Discharge refrigerant circuit.
- Flush refrigerant circuit with
compressed air and nitrogen.
- Re-charge refrigerant circuit.
- Repeat test.
- Expansion valve malfunctioning - Replace expansion valve.
Note:
- Overfilling with refrigerant oil can
occur if, for example, the
compressor has been replaced
without adjusting the quantity of
refrigerant oil.
- If expansion valve is
malfunctioning (permanently
open), evaporator temperature is
no longer regulated such that only
refrigerant in gas form exits from
the evaporator. Under certain
usage conditions, liquid droplets
may then be drawn in by the
compressor and cause noise
(liquid cannot be compressed).
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13/2/2005