Clio 200 losing water

My Clio 200 has started losing water but no signs of a leak. First noticed what sounded like gushing water noise from behind glove box. The oil looks fine and no problems with heating...any ideas??
 
It could possibly be a leak in the thermostat housing - mine had lost a lot of water/coolant but no signs of a leak from under the car. When the garage checked it, they found the leak in the housing.
 
Well gushing water behind glove box could be scuttle panel as the hole is right behind that.