When something boils, it is absorbing heat - a pot of water only boils when it absorbs heat from a hot stove. The refrigerant in an A/C system cools the air by absorbing heat. That’s because ‘cold’ isn’t really a thing - coldness is just a lack of heat. If you want to make anything cooler, you need to remove heat from it. Where water normally boils at 212 degrees Fahrenheit (and freezes at 32 degrees), a refrigerant like R-134a boils at 15 degrees below zero (and freezes at -154 degrees). What is refrigerant?Ī refrigerant is a liquid or a gas with a very low boiling point. The blower fan then blows air across the heater core and through a series of ducts into the cabin. The water pump circulates hot coolant to the heater core under the dashboard, where it provides heat for the passenger compartment. The cooling system has a second function – to provide heat for the car’s cabin. The thermostat stops the flow of coolant on a cold engine to allow it to heat up faster, and then opens as needed to keep the engine’s temperature constant. Once the engine has reached a certain temperature, a thermostat opens to control the flow of coolant through the radiator. When you start your engine, a water pump circulates the coolant through the engine and radiator. What is coolant in a car?Ĭoolant is a 50/50 mixture of water and antifreeze. It keeps the temperature at a constant level to ensure the car runs efficiently. The cooling system uses coolant to keep the keep the engine from overheating. When a vehicle’s engine is running, it generates a lot of heat, which must be regulated to avoid damaging the engine.
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