Antifreeze and coolant are the same thing.
Yes
antifreeze is usually mixed 50 / 50 with preferably distilled water for your cooling system ( up to 60 % antifreeze if colder climate ) which includes the radiator , heater core , radiator hoses , heater hoses etc.
same thing happened to me. it is the antifreeze return line. rubber hose. access the oil filter spot and connects radiator to water pump i think.
Same place you put the water
You should remove the antifreeze with a shop vac if possible, antifreeze will not hurt the water, but is just one more thing in the water that you do not need to be there.
My car does the same thing to me. I'm going to sell it.
The thing you should never do is put 100% water. You can buy the 100 percent antifreeze(the green color kind) and just mix it yourself. You shouldn't put 100% antifreeze either, depending on where you live and the usual temperature you drive through. For a more colder area, you would put more antifreeze than water and hot places about 50/50 antifreeze/water.
Most antifreeze is the same. You can use any brand of automobile antifreeze; even the cheap stuff. Just remember to make it into a solution of 50% antifreeze to 50% water before putting it in your car.
No, it is a noun (a thing).
Always use antifreeze. Water does not have any water pump lubricants or anti corrosion properties, antifreeze coolant does.
Antifreeze is typically denser than water, so it will sink when added to water.