Most likely - broken gasket.
is the line that serves as overflow tanks of oil to a tank specific to prevent the oil overflows into the sea.
Usually a blown head gasket.
If is oil then you have a bad intake manifold gasket. If it is transmission fluid then the cooling tank in the radiator is bad.
A gas tank can indeed overflow if it is not full. A gas tank can overflow if the pressure inside of it is too high.
It is to let you know when an underground oil tank is filled to its capacity so not to overflow.
check to see if the overflow bottle cap is in 2 parts allowing antifreese to escape the overflow tank system when the engine is running your car might also be running cold all the time even though the overflow tank shows full
The purpose of the toilet tank overflow tube is to prevent water from overflowing the tank by diverting excess water into the toilet bowl. When the water level in the tank rises too high, the overflow tube allows the excess water to flow into the bowl, preventing a potential overflow.
Engine overheating will cause the anti-freeze to surge into the overflow tank. A blown head gasket will also cause the anti-freeze to surge into the overflow tank.
Rust from your cooling system is flowing back into the overflow tank when the motor warms up.
Yes. It happened to me. Sometimes the vents for the two tanks are tied together. If you then overflow the black tank it will flow into the grey.
Right front side of the engine compartment - located between the battery and the radiator overflow tank
The overflow tank is either cracked or its overheating and leaking from the cap