A3 Quattro V6-3.2L (BUB) (2008)
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With the heater core removed, check heating and A/C unit for soiling (via heater core opening - A -).
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Remove any dirt or coolant still inside the A/C unit (heater) after the heat exchanger is removed.
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Slide heater core into heating and A/C unit.
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Remove old clamps - B - from both coolant pipes - C -.
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Install new (included in delivery of heater core) clamps - A - on both coolant pipes for heater core according to illustration.
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Moisten new seals - A - (included in heater core delivery casing) lightly with coolant.