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2000-2001 Audi A6 Quattro Expansion Tank - Genuine W0133-1617253
An expansion tank contains the coolant that pressure forced out of the radiator. A running car increases the temperature of the coolant circulating through the water jackets, which causes increasing pressure in the cooling system. When the pressure builds high enough, the radiator cap allows that pressure to escape into the coolant reservoir through. Most of the coolant forced into the expansion tank returns to the radiator naturally after a few hours. Without an expansion tank, the coolant that was released under pressure would spill out onto the road. The tank can start leaking because of harsh weather or wear and tear. When this happens a new unit should be added to maintain the vehicle's cooling systems in perfect shape. OES Genuine manufactures a reliable back-up tank for when the original one that came with your 20o0-2001 Audi A6 Quattro is rendered useless.
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