Heater & Defroster
A vehicle's heater is designed to warm the passenger cabin, with heat from the engine,and prevent condensation build-up on the windows. It does this by taking excess heat from the engines internal combustion process and blowing it into the vehicle through vents. Engines produce so much excessive heat that if it was not removed, it could destroy the engine. Excess heat is normally removed through the vehicles cooling system and the exhaust system. The unit that transfers heat to the passenger’s cabin is called the heater core and is normally located near inside the dashboard. This heater core is like a small radiator and has warm coolant flowing through tubes. Heater fans are than used to blow air across the tubes and fins that are attached to the tubes directly into heater vents which lead into the passenger cabin.
The defroster on a vehicle has the job of removing condensation that is built up on the glass inside the vehicle. Vehicles develop condensation because interior items such as carpets, seats and other cloth or vinyl upholstery items make the inside of a vehicle warmer then the outside metal surface. A defroster works by blowing warm air against the windshield, this warm air holds more water than cold air which is why the condensation evaporates when warm air is blown against it. In vehicles with air conditioning, there is also a component of the air conditioning that dehumidifies air that is coming out of the vents. This process allows for dry air to be blown across the windshield and around the car which also will pick up the condensation built up on the windows.
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