antifreeze keeps your car from overheating, it flows thru your radiator hose, without it your motor would blow
antifreeze antifreeze a fifty fifty micture of water and antifrez is best
So that the water used as coolant in most car radiators does not freeze overnight. If it does then, because ice expands as it freezes and melts, it can crack the engine block. The antifreeze lowers the freezing point of the coolant and reduces the risk. The more antifreeze, the less risk of freezing. But too much and it will boil when the car is running. Additives in antifreeze also reduces corrosion and raises the boiling point.
All the time
some people have said you should and others have said you dont have to. I myself have never put antifreeze in the during installation in all the years i have worked on cars
the antifreeze runs through all your water lines in your car . . . . you put it in your water tank or radiator
You mix it with water.
So that the coolant can stay in liquid form and flow through the cooling system.
In the coolant reservoir when the engine is cool.
Nothing Nothing
YES
Not if you want to keep driving the car!
If that space has heat loss (and it most definitely has) then sure - it is possible to put radiators there.