Water tank in my van gets very hot and water dissapears?

Question

Water tank in my van gets very hot and water dissapears?

Answer 1

.Ok . And your question is? You may want to include a little more info , such as make /model / yr . What water "tank" you are referring to.

Answer 2

well you may have a small hole so as the water boils it the tank its turning in to steam and the pressure its pushing the steam through the holes causing lose of water

Answer 3

If you're referring to the coolant overflow reservoir, you either have a leak ro you don't have a 50/50 mixture of water/anti-freeze.

Answer 4

coolant leak, thermostat bad, blown head gasket- Take it to a shop and keep water in it at all times