HEAT EXCHANGER: Describes a type of radiator used either to cool or heat through transferring heat from one object to another.
HEAT SHIELD: Describes a sheet metal part, usually reflective, asbestos-lined, that protects heat-sensitive components from heat radiation of the exhaust system.
HEATED AIR INLET SYSTEM (HAI): Describes a system that operates during cold weather and cold start that brings warm, filtered air into the engine to control the engine's volume of cold air.
HEATED INTAKE: Describes a device that helps to vapourise fuel in a cold engine in which the thermostat in the air cleaner horn is connected to the outside of the exhaust manifold. As the engine warms up, the thermostat opens the damper so that air is taken in from the end of the horn.
HEAT RISER: Describes a thermostatic spring that opens the flapper when the engine warms up, thus providing better cold engine operation.
LIQUID-COOLED: Describes an internal combustion engine that is cooled by the passage of water or oil.
THERMOSTAT: Describes a temperature-sensitive device used in an engine's cooling system to control the coolant flow between the cylinder block radiator. Set into the engine block, the thermostat will shut off the circulation of water until the water temperature reaches the point at which the thermostat is set to open.
THERMOSTATIC AIR CLEANER (TAC): Describes a type of air cleaner which also controls the temperature of the air entering the engine, regulating air intake temperature at about 27-46°C using a control damper that mixes pre-heated air from an inlet at the exhaust manifold with air from a cold air inlet.
PORTED VACUUM SWITCH (PVS): Describes a temperature actuated switch whose role it is to change vacuum connections when the coolant temperature changes.
RADIATOR: Describes the device whose role is to cool the liquid in the cooling system by circulating it through a series of water channels exposed to air ducts.
RADIATOR CAP: Describes the pressure cap that sits at the top of the radiator.
RADIATOR DRAIN COCK: Describes an alternative form of radiator tap that does not require any tool to drain the coolant from a radiator unlike the radiator drain plug.
RADIATOR DRAIN PLUG: Describes a closure plug, which is fully threaded, used to drain the radiator.
RADIATOR FAN: Describes a crankshaft-driven fan connected by a temperature-sensitive viscous coupling.
RADIATOR FAN MOTOR: Describes an electrically operated motor responsible that drives the radiator fan.
RADIATOR FILL HOLE: Describes the opening at the top of a radiator to add fresh water and coolant.
RADIATOR GRILLE: Describes the grating that admits cooling air to the radiator.
RADIATOR GRILLE SURROUND: Describes the sheet metal panel used to mount the radiator grille that is usually combined with the front apron forming a single panel.
RADIATOR SUPPORT PANEL: Describes a panel located behind the radiator grille surround that provides a mounting for the radiator while connecting the mudguard skirts at their front edge.
RADIATOR TANK: Describes the horizontally arranged reservoir that holds the coolant in a radiator.
REVERSE FLUSH: Describes the procedure of cleaning a vehicle's cooling system by pumping a powerful cleaning agent through the system in a direction opposite to that of normal flow.
SIDE RADIATOR GUARD: Describes a moulded cover panel fitted to the sides of the radiator protecting it from water splashes.
VAPOUR SEPARATOR: Describes a device fitted on vehicles equipped with air conditioning designed to prevent vapour lock by feeding vapours back to the fuel tank via a separate line.
WARM-UP CONTROL UNIT: Describes a type of unit that produces a richer mixture needed for cold running that includes an electrically heated thermostatic spring, that reduces the force on a spring-loaded control diaphragm.
WATER COOLING SYSTEM: Describes a cooling system used on most cars to keep the temperature of the engine down to a desirable level in which engine heat is removed through water acting as a coolant surrounding the cylinders in a water jacket. A typical water-cooling system includes a coolant pump, hoses, water passages, thermostat and a radiator.
WATER JACKET: Describes the area around the cylinder block and intake manifold left hollow so that water may be flow in for cooling.
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