I was driving on the highway for about 40 miles when the low coolant sign appeared (I know that the coolant level was good before driving)
I stopped on the side of the road to notice a LOT of smoke coming from the engine bay : a hose going towards the heater had punctured. Got the car towed and replaced the hose : not leaking anymore.
Drove it again today for about 20 miles and noticed a smell of coolant. Got home and another hose was leaking !
It is the small hose connected to the upper rad pipe. The car is a 12V VR6 jetta and it stayed spot on the right temperature all along, is there a reason that could make the pressure go too high or something like that ? Thanks !