Water Reservoir Tank Boiling

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.

Water reservoir tank boiling.

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. You can experience a shot of boiling water exploding under pressure. I suspect that the boiling you were seeing in the reservoir wasn t boiling at all but was actually combustion gasses being blown into the water jacket and migrating out to the reservoir where they were coming out as bubbles. Your local repair shop can perform test to identify cylinder head or engine block cracks.

The engine cooling system is pressurized somewhere between 5 to 15 pounds per square inch. It means there is air in your cooling system and this is always a bad thing. The increase in pressure will also increase the boiling point of the coolant. Here is a handy chart if you ever need it.

That would indicate a blown headgasket. It has some other useful tools and info in it. 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. The fact that the coolant was boiling out of the reservoir cap suggests that the thermostat may be stuck closed.

When this happens the coolant is not allowed to circulate throughout the vehicle s engine as it should. Do not remove a radiator cap from a hot engine to check. 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. 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.

In fact if you placed the coolant in a vacuum it would boil sooner.