Refrigerant Lines, Disconnecting And Connecting

Special tools and workshop equipment required 

• Engine Bung Set :VAS6122 

Loosening

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

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

-- 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 in the "Guided Fault Finding"  function.

Courtesy of AUDI OF AMERICA, LLC

-- Switch off the ignition.

-- Discharge the refrigerant circuit. Refer to Refrigerant Circuit or Working with A/C Service Station (1 Of 2) / Working with A/C Service Station (2 Of 2) .

-- To loosen the connection locations remove the front left wheel housing liner. Refer to the appropriate service information (for accessibility to the illustrated connection point).

-- Remove the bolt -A-.

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

Assembling

Assemble in the reverse order of removal. Note the following:

-- Replace the O-rings -D- and -G- and coat them lightly with refrigerant oil before installing (refer to REFRIGERANT CIRCUIT SEALS ). Refer to the Parts Information for the correct version.

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

-- If equipped, inspect the alignment pin -F- (not present on all connections) for damage and make sure that it is seated correctly.

-- 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 (1 Of 2) / Working with A/C Service Station (2 Of 2) .

-- Switch the ignition on.

-- 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 in the "Guided Fault Finding"  function.

-- Check the DTC memory for the Front A/C Display Control Head -E87- and, if necessary, delete any displayed faults using the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.

-- 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