A8 Quattro Sedan V8-4.2L (AUX) (2001)
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Sealing rings must always be replaced.
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Lightly cover sealing ring -A- with coolant and install it onto coolant line -B-.
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Place clamping bracket -A- (with studs) according to illustration onto connection at heater core -B-.
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Place clamping bracket -C- (with holes) onto coolant line -D- according to illustration.
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Insert coolant line -D- (with sealing ring) into connection of heater core -B-.
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Secure coolant line with the two clamping brackets -C- and -D- in heater core.
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Tighten both hex nuts -A- and -B- alternatingly and uniformly (tightening torque 3 Nm).
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Clamping brackets -C- and -D- must be installed as illustrated (observe outer contour).
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Make sure clamping brackets are not canted when tightening hex nuts.
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Check the position of the clamping brackets after securing coolant lines, they must not contact other components.
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Install the second coolant line in the same manner.
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Check coolant system for proper seal before installing glove compartment:
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Check position of the grommet in the opening of the coolant lines to plenum chamber before installing the glove compartment and the plenum
chamber cover.
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Coolant pump -V50- of pump-valve unit must only be operated after the coolant circuit has been vented.
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Dry operation of the pump-valve unit leads to destruction.
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Connect 2-pin harness connector to pump-valve unit only after venting the coolant circuit.