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Coolant overflow tank, coolant overflow reservoir, or coolant overflow bottle. The coolant reservoir also functions as a reserve tank in addition to functioning as an overflow tank. Radiator overflow tanks have a removable cap which allow for coolant to be added to the system when low.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.