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Cooling & Heating: Temp. Switches & Sensors

The cooling and heating systems in a car are taken for granted. As soon as one or the other stops working, it can become a near crisis. Repairing a heating or cooling system can be rather complicated and diagnostics even more so. The heating systems in most cars are very like the engine cooling system, or radiator. A small version radiator, called the heater core, is positioned in front of a fan. This heated air is blown into the cabin of the car and warms it up. It is usually located under the dash and is quite a job to replace or repair. The cooling system functions through several systems like an evaporator, compressor, condenser, or expansion valve. A refrigerant is compressed and it turns into hot gas. In a condenser the gas is cooled quickly and returns to liquid state. This cool liquid returns to a gas in the evaporator. A fan blows over the evaporator and the air is cooled.

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