Rear Expansion Valve, Removing And Installing

Special tools and workshop equipment required 

• Engine Bung Set:VAS 6122 
  Fig 1: Engine Bung Set

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• For all the following work, close the open lines and connections with clean plugs from the Engine Bung Set:VAS 6122  .

Remove the refrigerant lines

-- Switch off the ignition.

-- Discharge the refrigerant circuit. Refer to Refrigerant Circuit or A/C SERVICE STATION, USING .

-- Remove the left underbody trim panel. Refer to UNDERBODY TRIM PANELS, REMOVING AND INSTALLING .

-- Remove the NX1 tunnel transmission. Refer to OVERVIEW - HEAT SHIELD .

-- Loosen the heat shield mat on the left center tunnel in the area of the transmission from the vehicle.

-- Loosen the bracket for the refrigerant lines from the underbody. Refer to OVERVIEW - EXPANSION VALVE AND REFRIGERANT LINES TO REAR HEATER AND A/C UNIT, PR NUMBER 9AH/ 9AQ .

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-- Remove the nut -A-.

-- Remove the refrigerant lines -B and C- from the expansion valve -D-.

-- Remove the bolts -A-.

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-- Remove the expansion valve -B- from refrigerant lines -C and D- (to the evaporator in the rear heater and A/C unit).

Installing

Install in the reverse order of removal while noting the following:

-- Clean refrigerant line connections on expansion valve -B- and on refrigerant lines -C and D-, and check for damage.

-- Replace the O-rings -E and F-. Refer to the Parts Information for the correct version.

-- Coat the O-rings -E and F- with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .

-- Ensure that the O-ring seals -E and F- are properly seated on the connections of refrigerant lines -C and D- to the evaporator.

-- Ensure that the retaining plate -G- is seated properly on refrigerant lines -C and D-.

-- Place expansion valve -B- on the refrigerant line connections -C and D-.

-- Install the bolts -A-.

-- Clean refrigerant line connections on refrigerant lines -B and C-, and check for damage.

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-- Replace the O-ring seals -E and F- and lightly coat with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS and to the Parts Information for different versions.

-- Check the O-rings -E and F- in the groove of the connections for correct seating.

• Install the refrigerant lines stress-free.

-- Insert refrigerant lines -B and C- on expansion valve.

-- Screw in the nut -A-.

-- Install the remaining removed components.

-- 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.

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

Vehicles with High-Voltage System

-- Switch the ignition on.

-- Vehicles with Heat Pump Function, Initiate the basic setting of the A/C system through the Thermal Management Control Module -J1024- and activate the power-controlled valves using the routine Charge/flush the refrigerant circuit stop routine  using the Vehicle Diagnostic Tester .

Continuation for all vehicles

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

Tightening Specifications

• Refer to OVERVIEW - EXPANSION VALVE AND REFRIGERANT LINES TO REAR HEATER AND A/C UNIT, PR NUMBER 9AH/ 9AQ 
• Refer to UNDERBODY TRIM PANELS, REMOVING AND INSTALLING .
• Refer to OVERVIEW - HEAT SHIELD .