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Coolant-recovery Tank

A storage container that is used in a coolant-recovery system.

Coolant-temperature Sensor

A thermistor that sends a signal to the electronic control unit relative to the coolant temperature in a computerized engine-control system.

Cooling Coil

1. An evaporator. 2. An oil cooler. 3. An auxiliary cooler.

Cooling Method

The method used to remove excess heat from an engine or system, such as air cooling or liquid cooling.

Cooling System

1. An air conditioner. 2. A system of parts that circulates coolant through the engine to remove heat. 3. A system to remove heat from a heat-generating mechanism.

Cooling System

After a vehicle's engine comes up to operating temperature, its thermostat opens and the water pump begins to circulate coolant through the vehicle's engine block and out to the radiator. This helps to maintain the engine at an optimal temperature and prevent overheating. A cooling system requires regular maintenance. Typically, the fluid must be drained, and some automakers recommend flushing the system, as well. Refer to the owner's manual for more details.

Cooling-fan Controller Module

An electronic unit that will cycle the cooling fan ON and OFF, in response to signals from other engine sensors.

Cooling-system Fan

An electrically- or mechanically-driven rotating device, having four to seven pitched blades to move air past a heat exchanger, such as the radiator.

Copolymer

A substance made of giant molecules formed from the smaller molecules of two or more unlike substances.

Copper (Cu)

A reddish-colored metallic element, with great electrical properties; one of the oldest metals known.

Copper Gasket

A gasket made of copper and used in high-temperature and pressure conditions.

Copper Sulfate

A chemical used to detect chrome-plated cylinders and test crankshafts for Tuftriding.

Copper-asbestos-copper Gasket

A gasket made of copper-clad asbestos; now rare and not used due to the dangers associated with asbestos fibers.

Cord

An inner material of textile, steel, fiberglass, or wire running through the plies of a tire that produce strength.

Cord Material

A material, such as rayon, nylon, fiberglass, polyester, or steel used in tire construction to provide strength and maintain desired shape.

Cord Plies

The layers of rubber-impregnated cord material molded in the sidewalls of the tire casing.

Core

1. The interior of a hollow casing. 2. The coolant passages and fins of a radiator or heater found between the two header tanks. 3. A used part or assembly that is to be returned to the vendor for rebuilding.

Core Hole

1. A hole provided to facilitate sand casting. 2. A cavity in a casting caused by the shifting of the core during manufacturing.

Core Loss

The electric los occurring in the core of an armature or transformer due to eddy currents, hysteresis, and like influences.

Core Plug

A metal, cup-shaped disc in a cast component, such as the engine block, to seal openings required by the casting tools that may pop out to protect it from freezing damage. Also known as freeze plug.