Changeover valve broken - quick fix

This broke on the drive home today (2000 Sprinter 208) and dumped all the water out of the system.

I bypassed it with an old sparkplug socket I had. This now means the heater core is always getting water circulating through it.

Does this matter? I live in a hot country so I never have the cabin heater on so it's not like I'm missing out on owt...