have to replace leaking coolant flange today, is it possible to do it without draining the radiator?
how many miles is on your car?
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i had my car overhead due to a bad waterpump. this melted my coolant flange to the point of replacement.
when i replaced mine, i of course drained and flushed the coolant system.
whatever you do, be sure to replace the coolant with the G12 coolant.
if you dont, the coolant will "gel" and seize up the waterpump, leaving you with having to replace the pump again.
also, if you need to replace the pump, look into a metal impellar, and not the cheap plastic ones that come OEM.
i wish you all the best of luck