Here's what I would do while you're in there (and exactly what I did):



Water pump (recommend HEPU)
Thermostat
BimmerFix stent kit (very important)
Hoses
Coolant
Overflow tank
Belts (AC and serpentine)
Idler pulley and both tensioners


Also be prepared to do the oil thermostat gasket. Might as well do it while you have the belts off and radiator removed.

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2007 E70 4.8i