Heater Core, Removing And Installing: Removing

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Removing

-- Perform the preparation work for removing the heater core. Refer to HEATER CORE, PREPARING FOR REMOVAL .

-- Open the cap on the coolant expansion tank and release the pressure in the coolant system. Refer to DRAINING for CALB, DRAINING for CPNB, DRAINING for CTUC and CTUD, or DRAINING for CAEB, CPMB, CPMA, or DRAINING for CHJA .

-- Mark the arrangement of coolant hoses -A- (supply to cylinder head) and -B- (return to coolant pump).

Fig 1: Identifying Battery (+) Cable, Coolant Hoses And Plenum Chamber Grommet

Courtesy of AUDI OF AMERICA, LLC

NOTE:

The heater core is designed for a specific coolant flow direction. Therefore, coolant hoses must be connected on the correct sides.

Bleed the coolant circuit. Refer to FILLING for CALB, FILLING for CPNB, FILLING for CTUC and CTUD, FILLING for CAEB, CPMB, CPMA, or FILLING for CHJA .

Note: bleeding may be a part of "Coolant Mixture Ratio" in some draining and filling procedures.

-- Clamp the coolant hoses -A- and -B- with hose clamps.

-- Cover the area beneath connections for coolant hoses -A- and -B-, for example with absorbent paper.

-- Remove the coolant hoses -A- and -B- from the connections to the A/C heater core. Refer to CONNECTION DIAGRAM - COOLANT HOSES for CALB, CONNECTION DIAGRAM - COOLANT HOSES for CPNB, CONNECTION DIAGRAM - COOLANT HOSES for CTUC and CTUD, COOLANT HOSE, CONNECTION DIAGRAM, NON-HYBRID VEHICLES WITH ALL ENGINE CODES EXCEPT CDZA for CAEB, CPMB, CPMA, or CONNECTION DIAGRAM, COOLANT HOSE, HYBRID VEHICLES for CHJA, .

-- Insert one section each of hose -A- and -B- on to both connections to heater core.

Fig 2: Using A Compressed Air Gun Carefully Blow Coolant Out Of Heater Core

Courtesy of AUDI OF AMERICA, LLC

-- Place a container -B- under the other end of the hose -C-.

-- Using a compressed air gun -D-, carefully blow coolant out of heater core (into container -B-) via hose -A-.

-- Remove the clamps -B- and -C- from the heater core connections -A-.

Fig 3: Removing Heat Exchanger

Courtesy of AUDI OF AMERICA, LLC

-- Loosen both coolant pipes -D- and -E- from the heater core connections -A-.

-- Remove the heater core -A- in the direction of the -arrow-.

NOTE:

This illustration shows a heater core with connectors as it is installed in production (Fig 3). If the heater core was already replaced once, then both coolant pipes are held in the replacement heater core with a bracket -A-. Remove the bolt -B- on this heater core. Install a longer screw -C- (with a M5 thread) all the way to the end as shown in the illustration and with this screw, loosen the bracket -A- from the connection.

Fig 4: Identifying Replacement Heater Core With Bracket

Courtesy of AUDI OF AMERICA, LLC