The air-conditioning is based on a supplementary-equipment kit for the Audi A4. It is driven by a 3.8 kW electric motor (380 V). The painted stator is equipped with steering brake rollers and has a 12 V battery under the air-conditioning unit and a storage compartment for measuring equipment. The unit is already filled with coolant and can be operated without additional equipment. All the test connections for measurements exist. The 12 V and 380 V switch can be locked, two keys are supplied for each of them.