In order to properly diagnose a water leak issue, it is necessary for the cooling sytem to be pressurized. Your mechanic should have a special tool that he connects to your radiator that will pump the cooling system with air. This increased pressure will force the coolant out of any leak the system may have.
assuming you have the k series engine I would investigate signs of head gasket problems if you have no visible leaks. you might want to try a pressure tester on the cooling system this usually makes leaks more evident.
This depends on where the leak is. A hose could be loose or broken or there could be a radiator or engine leak. The area of the leak needs to be found to be able to diagnose.
Spray soapy water on all small black rubber hoses on engine when running. If any place along any hose causes soapy water to "blow bubbles" the leak will be there. Old trick that may or may not work.
there cannot be a water leak in a car! duh... Actually In one of my driving school cars, I kept a Thomas guide map book on the passenger side floor in the back seat. For about a week I noticed the book was always wet, I thought my water bottle was leaking on it, but it continued with no water bottle in the vehicle. We took it to the mechanic and found the drain hose for AC condensation had to be replaced and was leaking on the floor board. So cars CAN leak water. call your dealer and tell them about it.
Initially, no you had best not select any various cars
when it comes to cars if it there is liquid ther it can leak. so Yes
Hopefully none
First you need to diagnose the source of the leak then we can help you fix it.
If you have a water leak, you need the check the drain tube at each corner. If it will not move, check the fuses.
NO... You have other problems. Sounds like WATER is in the fuel.
Possible health problems due to radioactive gas leak in the atmosphere?
Unless it is something totally obvious - fuel leak - oil leak - sparking wires - etc - essentially, you can't.