If you use plain water, below 32 degrees the coolant and engine block will freeze. Anti freeze also allow coolant to reach a higher temperature, ( plain water boils at 212 degrees F ) before boiling.
if you run your engine without antifreeze your car will overheat and ruin the engine.
No
Antifreeze/Coolant is a fluid that prevents the car from overheating or becoming so cold that it won't start. Without it, in the summer, your car would run too hot, and in the winter, your car wouldn't run at all.
Nothing Nothing
if you can smell antifreeze you need to replace the heater core in the vehicle
YES
If you run it that way you will cause internal damage.
You can run up to 75 percent antifreeze without any trouble. -------------------------------------------------------------------------------------------------- Actually , Ford states not to exceed ( 60 % antifreeze )
crack the engine block and oil mixes with water or antifreeze.
you can use as much as you like as it makes the car run cooler
It will overheat because the water is needed to circulate/transfer the heat.
It is recommended to run a 50% mixture all year round.