Part Number: 1K0121407A. for Volkswagen Tiguan 2009-2016. Type: Coolant Radiator Reservoir Tank. for Volkswagen Passat 2006-2010. for Volkswagen Passat 2012-2016. for Volkswagen Jetta 2005-2016. When a coolant expansion tank has any issues it can lead to issues that: Constantly low on coolant, coolant leaks, engine overheating.
