The battery probably needs replacing. It sounds like it’s down on power and the cold mornings have found it out.

It’s likely that it has overheated for some reason, which would explain why it was hard to restart and the coolant loss. The thermo fan won’t run if the ignition is not switched on, so check that before assuming it’s a problem with the fan. If the fan isn’t working as you say it could be a problem with the fan motor or a relay that’s failed and preventing power getting to the fan.

The Magna generally doesn't have a problem with the water pump, and Mitsubishi specialist Graham Lewis tells us he has customers who have had three belt changes without changing the water pump. He does, however, advise checking for any coolant staining, and if found, then change the pump. Otherwise, the pump generally doesn't give any trouble.