[MT-2500]

The top hose that hangs down is just a oveflow hose.
Does not hook to anything.
If you are losing heat your rad/engine is also low on coolant.
Fill it up and run a pressure leak check on engine and rad system.
Check the lower intake gaskets real close?
Any coolant running over back of engine?

Also make sure your engine oil does not have coolant in it.
If so fix it now or it is good by rods bearings.
MT