Water Reservoir Tank Boiling

The fact that the coolant was boiling out of the reservoir cap suggests that the thermostat may be stuck closed.

Water reservoir tank boiling.

Here is a handy chart if you ever need it. Your local repair shop can perform test to identify cylinder head or engine block cracks. Federal mogul radiator cap. That would indicate a blown headgasket.

The reason a bad cap can allow the water to boil is because the pressure the cap is designed to keep in the cooling system makes it more difficult for the water molecules to escape as a gas. One of the most common causes is a blown head gasket in which the air pressure inside the cylinder heads is transferred to the cooling system. You can experience a shot of boiling water exploding under pressure. It could mean that air is somehow getting into an otherwise pressurized liquid system or it could mean that the the last time the coolant was changed some air was.

The increase in pressure will also increase the boiling point of the coolant. If you re seeing gas bubbles or some boiling in the liquid when you remove the radiator cap a cracked head or block may be to blame. The engine cooling system is pressurized somewhere between 5 to 15 pounds per square inch. When this happens the coolant is not allowed to circulate throughout the vehicle s engine as it should.

This escaped air causes bubbling in the coolant antifreeze reservoir which can often be mistaken for boiling. Do not remove a radiator cap from a hot engine to check. When the coolant is released to the reservoir it may boil because of the fact that it is at atmospheric pressure and the water portion will boil at 212. It means there is air in your cooling system and this is always a bad thing.

Https invol co clo1ds in this video i ll show you how i was ableto fix the issue i had with the reservoir of my honda civic 1999.