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Electricity is required to heat the ignition source, with systems designed to be compatible with 6-volt, 12-volt, and 24-volt automotive and aircraft electrical systems. Most gasoline heaters produce between 5,000 and 50,000 BTU per hour. A built-in safety switch prevents fuel from flowing unless the fan is working.
In 1939, Nash added a thermostat to its system, making it the first thermostatic automobile climate control system. [4] The Weather Eye "was the first truly good heating and ventilating system." [ 9 ] Additionally, defoggers (defrosters) were incorporated with the introduction of the 3900 series cars that year.
For the 12 volt systems, the center contact is the positive terminal and the shell is the negative terminal. Most automobiles connect the negative terminal to the frame of the vehicle (negative ground). 12 volt auto connectors are made to comply with a standard by Underwriters Laboratories for safety. UL2089 was developed to cover the ...
This is achieved by leaving the ignition switch in the "on" position, and only moving it to "start" once the glowplug has finished pre-heating the engine. Once the engine is running, some cars continue to use the glowplugs until the engine has reached its operating temperature, in order to reduce the diesel exhaust emissions. Similarly, some ...
Some cars are produced with block heaters from the factory, while others are fitted with block heaters as an aftermarket add-on. [3] The most common type of block heater is an electric heating element in the engine block , which is connected through a power cord often routed through the vehicle's grille.
On modern vehicles, further regulation of cooling rate is provided by either variable speed or cycling radiator fans. Electric fans are controlled by a thermostatic switch or the engine control unit. Electric fans also have the advantage of giving good airflow and cooling at low engine revs or when stationary, such as in slow-moving traffic.
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