HEATER AND A/C UNIT, REMOVING AND INSTALLING, "High" A/C SYSTEM, PR NUMBER 9AH/ 9AQ: Removing

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.

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

Vehicles with High-Voltage System

-- 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.

Continuation for All Vehicles

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

-- Drain the coolant (engine coolant circuit). Refer to COOLANT, DRAINING AND FILLING .

-- If equipped, remove the left front muffler. Refer to FRONT MUFFLER, REMOVING AND INSTALLING .

-- Place the Shop Crane - Drip Tray:VAS 6208 underneath.

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-- Label the layout of the coolant hoses -C, D- at the connections to the heater core.

-- Clamp off the coolant hoses using the Hose Clamps - Up To 25mm:3094 .

-- Remove the coolant hoses by loosening the hose clamps -A, B-.

-- Remove the base support -A- of center console and insulation -B-. Refer to CENTER CONSOLE BRACKET, REMOVING AND INSTALLING .

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-- Clearly label the line routing to the four temperature sensors -A- through -D- on the air ducts.

Fig 1: Temperature Sensors, Air Ducts And Connector

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CAUTION:

Complaints about the regulation of the A/C system due to an incorrectly addressed temperature sensor or adjustment motors.

- Prior to disconnecting connectors or removing electrical components, clearly label them in order to rule out confusion.

-- Remove the temperature Sensor -A through D- from the air ducts and secure together with the corresponding wire on the rear heater and A/C unit, so that interfere with removal of the heater and A/C unit -E- and are not damaged. Refer to Left Rear Upper Body Vent Temperature Sensor -G635- / Right Rear Upper Body Vent Temperature Sensor -G636-, REMOVING AND INSTALLING, PR NUMBER 9AH, 9AQ and Left Rear Footwell Vent Temperature Sensor -G637- /Right Rear Footwell Vent Temperature Sensor -G638-, REMOVING AND INSTALLING .

-- Remove the nut -A- from the connection location of the refrigerant lines.

Fig 2: Refrigerant Line Connection Point And Hexagon Nut

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TIP

If the operating lever -B- is awkwardly positioned so that the nut -A- is not accessible, remove the rear recirculation door motor. Refer to Rear Recirculation Door Motor -V421-, REMOVING AND INSTALLING .

-- Loosen the heater and A/C unit -C- from the retaining points -B- and the air duct -A-.

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-- Remove the refrigerant line connection -H- on the connection point to the refrigerant lines -F-.

-- Place absorbent paper around the coolant lines -E-.

-- Remove the coolant lines -E- from the heat exchanger from the grommets in the center tunnel.

-- Remove the heater and A/C unit.

-- Cover the air ducts in the rear passenger compartment so that they are not compressed or damaged during further work steps.