Volkswagen Golf 1999 Service Manual page 4004

General information on refrigerant circuit
A/C Refrigerant Shut-Off Valve N43
The flow of refrigerant in the second evaporator is switched
on or off by the shut-off valve. It opens when voltage is
applied, switched by the A/C Programmer.
A/C Compressor Regulator Valve N280
The regulator valve is installed in the A/C compressor. It is
activated by the A/C Control Head E87 or the Climatronic
Control Module J255 . Pressure on the low pressure side is
influenced via the regulator valve and thus regulates the
temperature in the evaporator.
Note:
- A/C Compressor Regulator Valve N280 is a structural
component of the A/C compressor and cannot be replaced
separately.
Electrical components not installed on the
refrigerant circuit
A/C Programmer J127
This programmer switches off the refrigerant flow through
the 2nd evaporator when the temperature on the cooling
ribs of the 2nd evaporator sinks to the freezing point for
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13/2/2005