Refrigerant Shut-Off Valve -V424-, REMOVING AND INSTALLING: Removing

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

-- Switch the ignition on.

-- Vehicles with eat Pump Function, 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 .

-- Switch the ignition off.

-- Discharge the refrigerant circuit. Refer to Refrigerant Circuit (Refrigerant R134a Servicing, Refrigerant Circuit, Working with A/C Service Station) or Working with A/C Service Station .

-- Remove the plenum chamber cover. Refer to PLENUM CHAMBER COVER, REMOVING AND INSTALLING .

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-- Do not remove the coolant hoses -2- from the heater core.

• For better clarity, this image shows the Refrigerant Shut-Off Valve -V424- with the brake booster removed and the heater core without coolant hoses.
• To clean (flush) the refrigerant circuit, the Refrigerant Shut-Off Valve -V424- must be replaced by a shut-off valve that can be manually operated. This shut-off valve must be operated in an installed state.

-- Remove the windshield wiper motor. Refer to WINDSHIELD WIPER MOTOR -V-, REMOVING AND INSTALLING .

-- Remove the tower brace. Refer to TOWER BRACE, REMOVING AND INSTALLING .

-- Remove the brake booster -1- from the bracket and move to the side with the lines attached. Refer to BRAKE BOOSTER, REMOVING AND INSTALLING .

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-- Remove the nut -1- and the bolt -2-.

-- Remove the brake booster mount -3- upward from the bracket -4- and guide it out.

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-- Remove the refrigerant line from the pass-through for the refrigerant lines in the plenum chamber. Refer to PLENUM CHAMBER REFRIGERANT LINE PASS-THROUGH, REMOVING AND INSTALLING .

-- Remove the bolt -B-.

-- Remove the refrigerant line -A-.

-- Remove the refrigerant line -3- from the expansion valve to the evaporator in the front heater and A/C unit. Refer to FRONT EXPANSION VALVE, REMOVING AND INSTALLING .

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-- Disconnect the connector -8-.

-- Loosen the refrigerant lines -3 and 4- from the equipped brackets -6-, and carefully guide with the Refrigerant Shut-Off Valve -V424- -5- toward the left fender while paying attention to the connector -8- and the wiring belonging to it.

-- Before loosening the union nuts -C-, label the refrigerant lines -D, E- and their position to the Refrigerant Shut-Off Valve -V424- -B-.

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TIP

• The union nuts -C- can only be tightened when the refrigerant lines are removed. If their position is not labeled, then these can no longer be installed in one procedure.

Fig 1: Exploded View Of High-Voltage Battery Heater Core Refrigerant Shut-Off Valve -N542- With O-Ring

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-- Loosen the union nut -A- while counterholding on the Refrigerant Shut-Off Valve -V424- -B- at the same time.

-- Remove the shut-off valve -D-.