Heater And A/C Unit, Removing And Installing: Removing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2015 Audi RS 7, 2015 Audi A7 Quattro, 2014 Audi S7, 2014 Audi RS 7, and 2014 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Coolant Reservoir Cap

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WARNING:

There is a risk of scalding from hot steam and coolant.

The coolant system is under pressure when the engine is warm.
To reduce the pressure, cover the coolant reservoir cap with several cloths and then open it carefully.

-- Open the coolant reservoir cap -arrow-.

-- Discharge the refrigerant circuit, refer to REFRIGERANT CIRCUIT COMPONENTS, REPLACING .

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

-- Cover the area beneath connections for coolant hoses in the plenum chamber, for example with absorbent paper.

Fig 2: Heater Core Hoses

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-- Mark the location of the coolant hoses.

NOTE:

Keep a container underneath the respective coolant hose to prevent the coolant from entering the plenum chamber when removing coolant hoses.

-- Clamp off the coolant hoses -1 and 4- with the Hose Clamps - Up To 25 mm 3094 and remove the heater core by loosening the hose clamps -2 and 3-.

-- Slide a short hose -A and C- onto both of the connections.

Fig 3: Hoses And Compressed-Air Gun

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Insert a compressed-air gun -D- into the end of the hose.

-- Hold the container -B- under the second hose and carefully blow the coolant out of the heater core using the compressed-air gun.

-- Loosen the grommet -3- from the plenum chamber bulkhead mount -2- and remove it from the heater core connections -1-.

Fig 4: Heater Core Connections, Bulkhead Mount And Grommet

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-- Remove the expansion valve, refer to EXPANSION VALVE, REMOVING AND INSTALLING .

-- Remove the retaining plate -A- from the refrigerant lines -B and C-.

Fig 5: Retaining Plate And Refrigerant Lines

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-- Coat the support ring -E- with lubricant and pry it out of the mount toward the front.

-- Loosen the grommet -D- to the A/C unit from the plenum chamber bulkhead mount.

CAUTION:

There is a risk of ruining the grommet.

The grommet is connected to the A/C system and can be removed directly after disassembling the A/C system.

-- Remove the instrument panel, refer to INSTRUMENT PANEL, REMOVING AND INSTALLING .

-- Remove the air intake housing, refer to AIR INTAKE MANIFOLD, REMOVING AND INSTALLING .

-- Remove the nut -2- and then remove the ground cable -1-.

Fig 6: Ground Cable, Nut, Connector And Tab

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-- Open the tab -4- to disconnect the connector -3-.

-- Remove the air guide -2- upward.

Fig 7: Right Vent Temperature Sensor -G151 And Wiring Harness

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-- Free up the wiring harness -1-.

-- Disconnect the connector from the Right Vent Temperature Sensor -G151-.

Fig 8: Instrument Panel Vent Air Guide And Bolts

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-- Remove the bolt -3- from the expanding clip.

-- Remove the instrument panel vent air guide -1-.

-- Remove the central tube, refer to INSTRUMENT PANEL CENTRAL TUBE, REMOVING AND INSTALLING .

-- Remove the rear air guide channel, refer to Rear Air Guide Channel, Removing And Installing .

-- Remove the condensation water drain hose -1- from the A/C unit connection -2- on the left and right.

Fig 9: Condensation Water Drain Hose, A/C Unit Connection, Bolt And Tab

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-- Remove the bolt -3- and move the tab -4- in direction of -arrow- to release.

-- Remove the air guide channel -1 and 3- for the rear footwell vent from the air distribution housing -2- and move to the side -arrows-.

Fig 10: Air Distribution Housing And Air Guide Channels

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-- Pull the air distribution housing slightly toward the rear and remove it to the right.