A8L V8-4.2L (BFM) (2004)
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Use compressed-air gun to carefully blow coolant out of heat exchanger on driver's side and pump/valve unit (into collector).
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Detach hose clamp from hose -D-.
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Use hose clamp, for example, to pinch off return from heat exchanger on driver's side -B-.
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Use compressed-air gun to carefully blow coolant out of heat exchanger on front passenger's side and pump/valve unit (into collector).
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Detach hose clamp from hose -B-.
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Slacken off bolt -A- securing coolant pipe holder (in plenum chamber) by approx. 2 turns.
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Remove coolant pipe holder -B-.
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Moisten contact surface between both coolant pipes -D- and -E- at grommet -C- slightly with silicone lubricant (to ensure that pipes can be moved
without changing position of grommet).