Volkswagen Polo Service & Repair Manual: Electrical Components Not on Refrigerant Circuit

A/C Compressor Regulator Valve -N280

  Note For switching pressures, removing and installing switches and switch arrangement and version, see vehicle-specific refrigerant circuit. ...

A/C Programmer -J127

This programmer switches the refrigerant flow direction through the second evaporator if the temperature on the cooling fins on the second evaporator lowers to the fr ...

Other materials:

Primary Lock
The primary lock is the locking mechanism of an individual crimp contact in the contact housing. If necessary, housing securing mechanisms (secondary locks) must be released or removed using specified tool before releasing the contacts. ...

Replacing Reservoir, No Contaminants, No Loss of Refrigerant
  Discharge the refrigerant circuit. –  Replace the restrictor depending on the vehicle. –  Remove receiver or accumulator. –  Remove dirt from receiver or res ...

Checklist
The following actions must always be carried out in the given order in preparation for changing the wheel : In the event of a flat tyre, park your vehicle on a firm and level surface at a safe distance from the flow of traffic. Apply the handbrake firmly Braking, stopping an ...