A4 Quattro Cabriolet V6-3.2L (BKH) (2007)
Heater Core: Service and Repair
Heat Exchanger
‹› Hose clamps up to dia. 40 mm (3093) or hose clamps up to dia. 25 mm (3094)
‹› Compressed air gun, commercially available
‹› Cooling system tester (V.A.G 1274/) (with hand pump and corresponding adapters)
Removing
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Remove the plenum chamber cover.
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Unclamp the Battery (A) and remove it.
‹› Before disconnecting Battery (A), obtain anti-theft radio security code if necessary.
‹› In vehicles with electrically adjustable seats, move the seats back as far as possible before disconnecting the Battery (A).
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Dissipate pressure in coolant circuit by opening cap at coolant expansion tank.
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Mark arrangement of coolant hoses - A - and - B -.
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Clamp off both coolant hoses to the heat exchanger of the A/C unit (e.g. using hose clamps up to dia. 25 mm (3094)) and remove them.
‹› Connect the coolant hoses on the proper side:
‹› Coolant hose - A - supply hose from the cylinder head.
‹› Coolant hose - B - return hose to water pump.
‹› Bleed coolant circuit.
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Place a container under connection - A -.