300CE 175k
I just finished replacing upper timing chain seal, tensioner, belt, etc. I pulled the radiatior to have some more room to do the work. Got everything re-assembled and running smoothly. No more oil leaks, but apparently I did not handle the radiatior carefully enough. I must have bumped something. It is now leaking at the crimped plastic-to-metal seal on the driver's side. The oil drips in my driveway have been exchanged for coolant drips. Damn. So I have to put in a new radiator. Ordered it from Phil.

Would it make sense to do a thorough flush with the old radiator in? Then drain, install new radiator and refill? Or install new one then do a flush? Does it matter? My search of the site said to use citris flush. Can anyone reccomend a brand?
Thanks