No. As long as you don't go longer than 6 months on just water. You should check the water level in your recovery tank and radiator OFTEN. You should also change to a mix of water and anti-freeze as soon as possible. Water will freeze, damage engine components from expansion, and it can evaporate(leaving your engine eventually uncooled). Anti-freeze prevents the water from boiling into steam, which will ultimately empty your cooling system, and it prevents freezing. Water itself can also cause scale buildup on your engine, rust, calcium deposits, chlorine scales, etc.. mixing water with Anti-freeze also prevents those things from happening. It won't hurt to use just water, but anti-freeze should be your long term choice. And try to keep the ratio of anti-freeze and water to 50/50.
it is probably your water pump
Low coolant? Radiator plugged or restricted? Cooling fan not working? Water pump not circulating coolant? Thermostat not opening? Cooling system airbound?
check you water (coolant) level, make sure thermostat is working, radiator leaks, sensor problem
If by water you mean engine coolant, yes. Loss of coolant, antifreeze, is a major cause of overheating.
Yes
It is possible that the coolant mixture is not correct- that can make a car run hot. It is possible for the water pump to go out. Also it is possible to be having a problem with the radiator fan.
That's okay in an emergency but you should also be concerned why the coolant is that low. Have a trusted mechanic check it out soon cause you may have a more serious problem going on.
One gallon and antifreeze and one gallon of water are needed to make coolant. They are then mixed together in a large bucket and then pour into your vehicles radiator.
you mean there is coolant in the oil or oil in the coolant either ways sounds like a head gasket problem.
It can run but if it is leaking coolant it will cause a problem soon.
Assuming you mean coolant, coolant loss could be as simple as a loose hose clamp or as bad as blown head gasket or worse, a cracked head. Have a trusted mechanic pressure test the cooling system to help diagnose the problem.
Head gasket? Low coolant level? Water pump not circulating coolant? Thermostat not opening? Radiator plugged or restricted?