Volkswagen Golf Service & Repair Manual: Renewing components
| All components of the refrigerant circuit submitted for
quality monitoring must always be sealed (use the original
sealing caps from the genuine part). |
| The genuine parts (air conditioner compressor, reservoir,
receiver, evaporator and condenser) are charged with nitrogen
before shipment. This filling is being gradually discontinued,
the pressure of the nitrogen filling is so low that escaping gas
is no longer perceptible when the part is initially opened. |
| Where vehicles are fitted with an air conditioner compressor
without a magnetic clutch, the engine should be started only
when the refrigerant circuit has been fully assembled (since the
air conditioner compressor will always run when the engine is
running)
→ Chapter. |
| The air conditioner compressor with air conditioner
compressor regulating valve -N280- (without magnetic clutch) has
an internal oil circuit to ensure that the air conditioner
compressor is not damaged when the refrigerant circuit is empty.
This means that approx. 40 to 50 cm3
of refrigerant oil remains in the air conditioner compressor
→ Chapter. |
 Note
| Since genuine parts are sometimes stored for long periods in
various places, it can well be that gas will escape from some
parts when first opened but not from others (even among those
having the same part number). Therefore, be careful when
unscrewing the sealing caps from the genuine part connections
and allow the nitrogen gas to escape slowly. |
| Either a restrictor with a reservoir or an expansion valve
with a receiver is built into the refrigerant circuit. |
| Seal open connections and lines to prevent moisture from
entering. |
| The reservoir or receiver or cartridge of the dryer bag need
not be renewed under the following circumstances: |
| After an accident in which there was no damage to the
reservoir or receiver. |
| Repairs are performed quickly (no more delay than during a
normal repair time) and there was no moisture intrusion. The
vehicle is no more than 5 years old. |
| The reservoir or receiver or dryer cartridge should be
renewed under the following circumstances: |
| The refrigerant circuit was opened and the vehicle is more
than 5 years old. |
| The refrigerant circuit has been opened for in indeterminate
period (seepage leak). |
| Repairs take longer than a normal repair time and there has
been moisture intrusion. |
| Always renew collector/reservoir or dryer cartridge after
blowing through with compressed air or purging with refrigerant
R134a. Keep genuine parts sealed for as long as possible to keep
the ingress of moisture as low as possible. |
| The air conditioner compressor seizes. |
| The reservoir or receiver is damaged (e.g. in an accident). |
Caution
| Handling refrigerant
→ Volkswagen ServiceNet; Service handbook; Environmental
protection; Waste disposal; Current situation; Disposal
channels; Disposal of used oils; Refrigerant oils. |
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Note
Connecting air conditioner service station
→ Chapter.
Observe the test prerequisites
→ Cha ...
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Checking systems with an expansion valve, receiver and air conditioner
compressor regulating valve -N280- (with externally regulated air conditioner
compressor)