coolant leaks at water valve on 1994 BMW 740iL

my BMW is leaking from the water valve coolant pump which pumps the coolant into the water valve bypass. Upon replacing this unit I have beenadvice to replace the water valve junction also, it was said that there has been modification or revision done to these units because of complaints of car not heating up fast enough. Is this true and should I replace both units.

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1 answer
There is a revised heater control valve available, but if your heater was working correctly I wouldn't worry about much.

Zee