VW Polo manuals

Volkswagen Polo Service & Repair Manual: General Information

All components of the refrigerant circuit submitted for quality observation are always to be sealed (use original sealing caps of original part).
To date, the original parts (compressor, reservoir, receiver/dryer, evaporator and condenser) have been filled with nitrogen gas. This charging stops gradually or the charging pressure is so low that gas does not escape noticeably when opening.
On vehicles installed with a compressor with no A/C clutch, the engine is only to be started following complete assembly of the refrigerant circuit (compressor always in operation as well). Refer to → Chapter „Refrigerant Circuit, General Precautions“.
So that the compressor with A/C Compressor Regulator Valve -N280- (without A/C clutch) is not damaged when the refrigerant circuit is empty, it is equipped with a secured oil supply. This means that approximately 40 to 50 cm3 of refrigerant oil remains in the A/C compressor. Refer to → Chapter „Refrigerant Circuit, General Precautions“.
  Note
As original parts are sometimes stored for lengthy periods and at different locations within the spare parts organization, it is entirely possible that gas will escape from some parts and not from others on initial opening (even in the case of identical original part numbers). Sealing caps at original part connections are therefore to be removed carefully and the nitrogen gas allowed to escape slowly.
The refrigerant circuit is equipped either with a restrictor and accumulator or with an expansion valve and receiver/dryer.
Seal open connections and pipes (to prevent absorption of moisture).
Always replace the restrictor.
The reservoir/receiver/dryer or dryer bag/cartridge should not be replaced under the following conditions.
After an accident when there is no damage on the reservoir/receiver/dryer.
The repair was done quickly (not beyond the normal repair time) and no moisture has entered. The vehicle is not older than 5 years.
The reservoir/receiver/dryer or dryer cartridge should be replaced under the following conditions.
The refrigerant circuit was opened and the vehicle is older than 5 years.
The refrigerant circuit has been opened for an indefinite period of time (slow leak).
The repair exceeded the normal repair time and moisture has entered.
Always replace the receiver/dryer or dryer cartridge after flushing with compressed air, nitrogen or refrigerant R134a. Leave original parts in their packaging as long as possible to minimize the amount of moisture they absorb.
The A/C compressor has locked up.
The reservoir/receiver/dryer is damaged (accident).
   
Components, Replacing
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Leaking or Damaged Components except A/C Compressor, Reservoir or Receiver/Dryer
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