Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
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Clamp off coolant hoses - 1 - using Hose clamps, up to 40 mm. 3093 and disconnect coolant hoses to heater core.
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Connect a section of hose - A - onto upper connection of heater core.
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Hold suitable container - B - under the lower connection - C -.
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Using a compressed air gun, carefully blow coolant from heater core into container - B -.
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Remove bolt (6 mm socket head) - 1 - from connection flange between heater core connections.
NOTE: This allows the coolant pipes to move for removing the heater core.
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Remove driver side footwell trim
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Remove left footwell air vent
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Remove screws - 1 - and remove heater core trim.
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Cover floor carpet in area below heater core with leak-proof foil and absorbent paper.