Refrigerant Shut-Off Valve -V424-, REMOVING AND INSTALLING: Installing
Install in reverse order of removal and note the following:
-- Coat the O-ring seals -B- lightly with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .
-- Tighten the union nuts -C- all the way by hand.
-- Check the position of the refrigerant lines -D and E- to the Refrigerant Shut-Off Valve - V424- -B- using the label applied during removal, and correct if necessary.
-- Tighten the union nuts -C-, and while doing so, counterhold on the Refrigerant Shut-Off Valve -V424- -B- and make sure that the routing of the refrigerant lines is without tension.
- When tightening the union nut the refrigerant lines must not be tensioned.
-- Check the routing of the refrigerant lines after attaching. They must be inserted into the provided brackets and must not come in contact with other components.
-- Evacuate and fill the refrigerant circuit. Refer to Refrigerant Circuit (R134a) (Refrigerant R134a Servicing, Refrigerant Circuit, Working with A/C Service Station) or Working with A/C Service Station (R1234ya) (1 of 2) or Working with A/C Service Station (R1234yf) (2 of 2) .
-- Switch the ignition on.
-- On vehicles with a high-voltage system (Audi Q7 e-tron), 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 of the Front A/C Display Control Head -E87- (and of the Thermal Management Control Module -J1024-) and erase any displayed malfunctions 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 .