There is a drain that is plugged. May need to access it by removing glove compartment or accessing from wiper cowl? Not sure where exactly, but that's the likely source.
The way you stop your water pump from leaking on a Ford Transit Lorry depends on why it is leaking. The most common fix is to replace the gasket on the water pump.
check your hinges make sure the doors are not sagging or you can get new weather stripping and replace the old j.c. Whitney should have it
Unplug evaporator drain with a flexible wire or low pressure air
Repairing the section of pipe that is leaking will stop a leak on a hot water line.
you put it in a bag
You ned to put caulking around the top joint of the heater AC box where it mounts to the fire wall.
It is not water it is puss so just put some peroxide on it or band-aid brand stuff and it will be fine and will hopfuly stop leaking it.
This is an indication that your heater core is leaking. To stop the leaking you will have to replace the heater core or stop using your heater.
Replace it or turn your Hot Water tank temperature down
It depends on why it is leaking.
Most stop leak additives do nothing but empty your wallet. Replace the gasket that is leaking.
Sounds like the heater core is leaking!