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A fail-safe cooling system is a relatively state of the art piece of auto engineering that facilitates a vehicle to be driven under reduced power in the event that engine coolant is lost. For example, in case of a ruptured hose, the engine operates in an emergency mode with limited power for driving a short distance (10-50 miles depending on the system). For the car owner, this device, eliminates the cost and inconvenience of having the vehicle towed to a service station and does not leave the customer stranded.

The way it works is simple in logic terms - if the coolant level sensor reads below a critical amount, then the engine computer module switches the engine to an emergency limp-home mode, in which only half the cylinders get fuel. With only half the cylinders firing, the engine generates much less heat because it is operating at low power. The cylinders alternate between even- and odd-firing pistons. The engine is able to move the vehicle at moderate speeds (Up to about 50 mph).