Volkswagen Polo Service & Repair Manual: A/C Service and Recycling Units

Pressure Gauge, Tests and Measurements

Indicators on pressure gauge 1 -  Temperature scale for refrigerant R134a CF3–CH2F or CH2F–CF3. 2 -&nb ...

Extraction System Group Classifications

At this time, A/C service units for extracting, cleaning and filling refrigerant for motor vehicle A/C systems are available from various manufacturers. ...

Other materials:

Checking with Expansion Valve and Receiver/Dryer, with Internally Regulated A/C Compressor
  Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements. Refer to → Chapter „Pressures, Checking“. –  ...

Winter tyres
First read and observe the introductory information and safety warningsIn winter road conditions, winter tyres will considerably improve the car's handling. The design of summer tyres (width, rubber compound, tread pattern) gives less grip on ice and snow. Volkswagen urgently recommends the ...

Checking with Restrictor and Reservoir, with Internally Regulated A/C Compressor
  Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements. Refer to → Chapter „Pressures, Checking“. –  ...