S6 Quattro Sedan V10-5.2L (BXA) (2007)
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Mark the assignment of coolant hoses - A - (supply to left heat exchanger) and - B - (supply to right heat exchanger).
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Disconnect connector - D - (to the Left Heat Regulation Valve (N175) and Right Heat Regulation Valve (N176)).
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Disconnect connector - E - (to the Coolant Pump (V50)).
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Clamp off coolant hose - C - (from the engine to the Coolant Pump (V50)) e.g. using hose clamps up to 25 mm dia. (3094).
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Remove coolant hoses - A - and - B - from the pump/valve unit connections.
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Remove the sealing bolt from the bleeder valve - B -.