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Volkswagen Golf Service & Repair Manual: Removing and installing refrigerant shut-off valve for high-voltage battery heat exchanger -N542

Volkswagen Golf Service & Repair Manual / Heating, air conditioning / Air conditioner / Refrigerant circuit / Removing and installing refrigerant shut-off valve for high-voltage battery heat exchanger -N542

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.
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.
   
–  Disconnect connector -A- from -N542--B-.
–  Loosen union nuts -C-. Counterhold on -N542--B- while doing so.
–  Remove refrigerant line -D- from heat exchanger for high-voltage battery → Chapter.
 

Removing and installing refrigerant shut-off valve for high-voltage battery heat exchanger -N542

–  Remove shut-off valve -N542--D-.
Installing
Installation is carried out in the reverse order. When installing, note the following.
  Note
Adhere to the installation instruction for seals -B- → Chapter.
Following attachment, check the routing of the refrigerant lines. They must be inserted in the holders provided and not make contact with other components.
–  Renew seals -B-; for correct version refer to → Electronic Parts Catalogue.
 

Removing and installing refrigerant shut-off valve for high-voltage battery heat exchanger -N542

–  Check restrictor in refrigerant line -D- (leading to heat exchanger for high-voltage battery) for soiling → Chapter.
–  Screw on union nuts -C- to stop by hand.
–  Install refrigerant line -D- to heat exchanger for high-voltage battery → Chapter.
–  Tighten union nuts -C-. Counterhold on -N542--B- 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 holders provided and not make contact with other components.
Also refer to the notes on commissioning of air conditioning system after filling → Air conditioning system with refrigerant R134a; Rep. gr.00.
–  Evacuate and charge refrigerant circuit → Air conditioner with refrigerant R134a; Rep. gr.00.
–  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 high-voltage battery heat exchanger -N542

Component Specified torque
Union nuts -C- 16.5 Nm
Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541
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