Yes. It raises the boiling point of the water it's mixed with so it won't turn into a gas at 100 degrees C.
No
I need to fill my car's radiator with antifreeze before winter comes.
It doesn't have one per se. The antifreeze overflow serves as the car's radiator cap. If you need to add antifreeze, add it there.
We always renew the antifreeze in our car before winter.
Yes
no but if in the winter you do not put in the car the engine will freeze you can also use water during the summer No!
the antifreeze runs through all your water lines in your car . . . . you put it in your water tank or radiator
No. The antifreeze has to be mixed with the water before the water freezes.
Not very well.
Maybe it is out of antifreeze? If older car, maybe you need the radiator and heater flushed.
If your use anything more concentrated than about half anitfreeze and half water, the radiator water will freeze at a considerably warmer temperature. There will be less protection. Also, antifreeze actually helps keep your car running cooler in summer. If you use straight antifreeze, the car will "boil over" at a much lower temperature. There will be less protection.
It is recommended to run a 50% mixture all year round.