hey guys, thanks for the help. i replace the radiator cap and now the system is running well!

so just to recap, what started out as an upper radiator hose leak turned into a new upper hose, new expansion tank and new cap.

cost of parts (approx cost, i installed all parts) $80 for new upper hose, $22 for new cap, $60 for new expansion tank.


but now she's good to go!!

thanks for the help

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2000 BMW X5 4.4i SPORT