This is a 180 degree thermostat.When standard thermostats fail, they lock in the closed position and prevent coolant flow to the engine, which can possibly cause serious damage to your engine. Only Fail-Safe is designed to lock in the open position when overheating occurs due to a failing cooling system component. This gives you maximum coolant flow, preventing expensive engine damage.

How it Works: Within normal operating temperatures, the Fail-Safe operates the same as any other thermostat.

What FAIL-SAFE Means: If the engine overheats due to a deteriorating cooling system part, the Fail-Safe has a secondary stroke that activates a precision engineered piston that automatically locks the valve into a wide open position, allowing coolant to circulate freely.

NOTE* Once the Fail-Safe thermostat has locked in the open position, it must be replaced and it is not longer good to use.