coolant expansion tank o-ring and level sensor proc.

[bimmerd00d]

Anyone explain how to separate that tank from the radiator, and what silicon if any i should use?

[Gary M]

Take out the air bleeder screw. Remove the radiator cap. Take out the allen screw. Remove the top black plastic cover. Pry up the expansion tank. The sensor doesn't come out with tank. It's underneath it and you need to remove the connector wires and the nut that holds it in and pull it straight down. Good luck it's a bitch to get a wrench in the enclosed area.