Audi Workshop Service and Repair Manuals > A3 Mk2 > Heating, ventilation, air conditioning system | Air conditioner with refrigerant R134a | Air conditioner | General information on air conditioning systems | Basic rules for working on refrigerant circuit | Additionally for vehicles with air conditioner compressor with no magnetic clutch (with air conditioner compressor regulating va

Additionally for vehicles with air conditioner compressor with no magnetic clutch (with air conditioner compressor regulating valveN280 only)

Additionally for vehicles with air conditioner compressor with no magnetic clutch (with air conditioner compressor regulating valve -N280- only)

l	The engine is only to be started following complete assembly of the refrigerant circuit (constant air conditioner compressor operation).

l	If the engine has to be operated with the refrigerant circuit empty, only do so for as long as absolutely essential and avoid increased engine speeds.