Refrigerant Lines, Disconnecting And Connecting

Special tools and workshop equipment required 

• Engine Bung Set:VAS6122 

• The procedure when loosening applies to all connection locations on the refrigerant circuit. There are differences in the line connection diameter, O-ring versions 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 illustration shows as an example the connection points between the refrigerant lines from the inner heat exchanger to the A/C compressor and to the condenser as well as the connection points on the opening in the perform to the refrigerant lines to the evaporator in the rear heater and A/C unit. These connection points are installed in the area under the left front fender.

• For all the following work, close the open lines and connections with clean plugs from the Engine Bung Set:VAS6122  .

Loosening

Vehicles with a High-Voltage System

-- Switch off (deactivate) the "parking air conditioner". Refer to Owner's Manual.

-- Initiate the A/C system basic setting through the Thermal Management Control Module -J1024- and open the power-activated valves through the stored routine "Extract, evacuate and fill the refrigerant circuit" using the Vehicle Diagnostic Tester.

Continuation for All Vehicles

-- Switch off the ignition.

-- Depending on the connection point, remove the components that hinder accessibility.

-- Discharge the refrigerant circuit. Refer to Refrigerant Circuit or Working with A/C Service Station .

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolt -A-.

-- Disconnect the connection points for refrigerant lines -B and C-.

Assembling

Install in reverse order of removal and note the following:

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

-- Replace the O-rings -D-. Refer to the Parts Information for the different versions.

-- Coat the O-ring seals -D- lightly with refrigerant oil before installing. Refer to SEALS AND GASKETS .

-- If equipped, check the alignment pins for damage and correct seating.

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

-- Evacuate and charge the refrigerant circuit. Refer to Refrigerant Circuit or Working with A/C Service Station .

Vehicles with a High-Voltage System

-- Initiate the basic setting of the A/C system through the Thermal Management Control Module -J1024- and activate the power-controlled valves using one of the routines stored there. "Charge/flush the refrigerant circuit stop routine" using the Vehicle Diagnostic Tester.

Continuation for All Vehicles

-- Start the A/C system after charging the refrigerant circuit. Refer to A/C SYSTEM, STARTING AFTER CHARGING REFRIGERANT CIRCUIT .

Tightening Specifications

• Refer to OVERVIEW - REFRIGERANT LINES