Connection Points Of Refrigerant Lines, Loosening and Assembling

Connection Points Of Refrigerant Lines, Loosening and Assembling

• The procedure for loosening applies to all connection points in the refrigerant circuit and for the branching point of refrigerant lines to rear heating & A/C unit. There are differences in diameter for line connections, versions of O-ring seals and mounting bolts.

• Depending on component location, various components in vicinity of connection points must be loosened or removed to be able to disconnect the connection point.

• The following figure shows the connection points between the refrigerant lines to the front A/C unit and to the rear A/C unit (these are installed in the area under the left front fender in the area of the A-pillar).

Loosening

- Switch off ignition.

- Drain the refrigerant circuit.

- Remove the left front wheel housing liner, refer to (for accessibility to the illustrated connection point).

- Remove screws - A -.






- Disconnect the connection point of refrigerant lines - B - and - C -.

- Disconnect the connection point of refrigerant lines - D - and - E -.

• This figure shows the connection point in the area of the A-pillar under the left front fender (outlet of the refrigerant lines to the evaporator in the rear A/C unit).

• Seal the open connections of the lines with suitable caps (to prevent dirt and moisture from getting in).

Assembling

Assembling is carried out in the reverse order, when doing this note the following:

- Replace O-ring seals - F - and - H -. Refer to the Electronic Parts Catalog.

- Thoroughly clean the refrigerant lines around the connection area and check for damage.

- Check alignment pins - G - (not present in all couplings) for damage and proper seating.

• Coat the O-ring with refrigerant oil before installing. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-rings.

• Note the different tightening torques of bolts - A -.

• Tightening torque of bolts - A - with a thread "M6" 10 Nm.

• Tightening torque of bolts - A - with a thread "M8" 20 Nm.

- Check the routing of the refrigerant lines after attachment. They must be inserted in the provided brackets in a tension-free manner and must not come in contact with other components.

- Reinstall removed components in the reverse order and reattach detached components.

- Evacuate and fill the refrigerant circuit.

- Check the event memory of the Climatronic control module (J255) , and erase any displayed malfunctions using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

- Operate the A/C system after filling the refrigerant circuit, refer to => [ A/C System Operating After Filling Refrigerant Circuit ] A/C System Operating After Filling Refrigerant Circuit.

• Note the information regarding operating the A/C system after filling.