A/C System Control and Regulation Components Outside Passenger Compartment

A/C System Control and Regulation Components Outside Passenger Compartment

• If there is a malfunction in the system, first check the Climatronic control module (J255) DTC memory. Refer to Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

• If no fault is displayed, read the measured value block for the Climatronic control module and activate the component with the "output diagnosis test mode" function on the Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

• The electrical test for various actuators, potentiometers and sensors is described in Guided Fault Finding using Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

• Servicing operations on refrigerant circuit are described in => [ Refrigerant Circuit, Servicing ] Refrigerant Circuit, Servicing.

• Perform the following work after completion of repair operations:

- Check Climatronic control module DTC memory and erase any possible displayed malfunctions using Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

- Check coding of Climatronic control module using Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

- Check adaptation of Climatronic control module using Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

- Perform A/C system basic setting using Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding" function.

• Coolant hoses from connections to A/C unit heat exchanger, removing and installing; refer to => [ Heater Core ] Service and Repair.

• A/C unit heater core connection in engine coolant circuit.

• Depending on vehicle production period, connection points may be installed in refrigerant lines on certain versions (not planned at this time, introduction not yet finalized). Refer to Electronic Parts Catalog (ETKA). As with connections on various components, these connection points may only be loosened and opened when the refrigerant circuit is empty. Refer to=> [ Refrigerant Circuit, Servicing ] Refrigerant Circuit, Servicing.

• Depending on the vehicle production period, a damping chamber may be installed in the refrigerant lines from the expansion valve to the compressor on certain versions (not planned at this time, introduction not yet finalized). Refer to the Electronic Parts Catalog (ETKA). The damping chamber balances out pressure fluctuations that can occur when operating the A/C compressor. Refer to => [ Refrigerant Circuit, Servicing ] Refrigerant Circuit, Servicing.

• Component group 1, components outside of passenger compartment, refer to => [ Components Outside of Passenger Compartment, Group 1 ] Components Outside of Passenger Compartment, Group 1

• Component group 2, components outside of passenger compartment, refer to => [ Components Outside of Passenger Compartment, Group 2 ] Components Outside of Passenger Compartment, Group 2