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Replacement of Cooling System Flange

Model: Volkswagen Jetta A4, MK 4 - Years: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Part: Antifreeze coolant

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Open the front bonnet and locate the cooling system flange: it is situated on the right side of the engine block (when viewed from the front) and is connected to several hoses and sensors. During disassembly, coolant will spill out: it is recommended to perform this repair with the engine cold.

Disconnect the hoses connected to the flange and the sensors (remove the locking pin); then unscrew the flange's fastening bolts and remove it from its seat; fit the new one by tightening the bolts and reconnecting the sensors and hoses; restore the coolant level.


Updated on 8 February 2026 by ScegliAuto


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by ScegliAuto

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