Volkswagen Touran Service Manual: A/C Service and Recycling Units

Pressure Gauge, Tests and Measurements

Indicators on pressure gauge 1 -  Temperature scale for refrigerant R134a CF3CH2F or CH2FCF3. 2 -  ...

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:

Volkswagen Touran Service Manual. Electrical Components Not on 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 freezing point for water (icing protection).   ...

Volkswagen Touran Service Manual. Refrigerant Circuit Component Arrangement
  Caution Non-approved tools or materials such as leak sealing additives can cause damage or malfunctions in the system. Only use tools and materials approved by the manufactu ...