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Volkswagen Golf Service & Repair Manual: Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

Volkswagen Golf Service & Repair Manual / Heating, air conditioning / Air conditioner / Refrigerant circuit / Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

Removing
–  Observe safety precautions → Chapter „Safety precautions when handling refrigerants“.
–  Comply with notes → Chapter „Working on refrigerant circuit“.
–  Observe safety precautions when working in the vicinity of high-voltage components → Chapter „Safety precautions when working in the vicinity of high-voltage components“.
–  Observe the risk category of the high-voltage system → Rep. gr.00.
–  Switch off ignition.
–  Drain refrigerant circuit.
   
–  Detach bracket -A- for solenoid valve 1 -N88- from plenum chamber bulkhead.
 

Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

–  Detach heat shield -B- in area of -N541--D- and of refrigerant line -F- (leading to connection on right longitudinal member) from plenum chamber bulkhead, and bend it back slightly.
–  Unscrew speed nuts -1- and -3-.
–  Fold the heat shield -2- as far forwards as necessary (and possible) -arrow-.
 

Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

–  Disconnect connector -C- of -N541--D-.
Risk of freezing injury caused by escaping pressurised refrigerant.There is a risk of injury to the skin and parts of the body due to freezing.Always wear safety gloves.Always wear safety goggles.Extract refrigerant, and open the refrigerant circuit immediately afterwards.If more than 10 minutes passed since the refrigerant has been extracted, do not open the refrigerant circuit prior to extracting refrigerant anew. Due to re-evaporation, pressure will be built up in the refrigerant circuit.
–  Loosen union nuts -E-. Counterhold on -N541--D- while doing so.
–  Detach refrigerant line -F- (leading to connection on right longitudinal member) from retainer on plenum chamber bulkhead.
 

Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

–  Remove shut-off valve -N541--D-.
Installing
Installation is carried out in the reverse order. When installing, note the following.
  Note
Following attachment, check the routing of the refrigerant lines. They must be inserted in the retainers provided and not make contact with any other components.
–  Renew seals -B- → Chapter; for correct version refer to → Electronic Parts Catalogue.
 

Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

–  Screw on union nuts -E- to stop by hand.
–  Secure refrigerant line -F- (leading to connection on right longitudinal member) in retainer on plenum chamber bulkhead.
–  Tighten union nuts -E-. Counterhold on -N541--D- while doing so, and make sure that refrigerant lines are routed free of stress.
  Note
When tightening the union nuts, make sure that the refrigerant lines remain free of stress.
Following attachment, check the routing of the refrigerant lines. They must be inserted in the retainers provided and not make contact with any other components.
–  Switch on ignition.
–  Read event memory of operating unit, Climatronic control unit -J255-, and clear any faults which may have been stored vehicle diagnostic tester in “Guided fault finding” mode.
Specified torque
 

Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541

Component Specified torque
Union nuts -E- 16.5 Nm
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Removing –  Observe safety precautions → Chapter „Safety precautions when handling refrigerants“. ...

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