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2. Automobile auxiliary power outlet - Wikipedia

   en.wikipedia.org/wiki/Automobile_auxiliary_power...

   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 ...

3. Thermoelectric cooling - Wikipedia

   en.wikipedia.org/wiki/Thermoelectric_cooling

   Thermoelectric cooling uses the Peltier effect to create a heat flux at the junction of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with consumption of electrical energy, depending on the direction of the current.

4. Gasoline heater - Wikipedia

   en.wikipedia.org/wiki/Gasoline_heater

   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.

5. Block heater - Wikipedia

   en.wikipedia.org/wiki/Block_heater

   An early automotive use was the "head bolt heater", invented by Andrew Freeman in the United States and patented on 8 November 1949. [ 1 ] [ 12 ] [ 13 ] These early heaters replaced one of the engine's head bolts with a hollow, threaded shank containing a resistive heating element.

6. Glow plug - Wikipedia

   en.wikipedia.org/wiki/Glow_plug

   This device is a pencil-shaped piece of metal with an electric heating element at the tip. A glowplug system consists of either a single glowplug in the inlet manifold, or one glowplug per cylinder. In older systems, the driver is required to manually activate the glowplug system and wait approximately 20 seconds before starting the engine.

7. Heater core - Wikipedia

   en.wikipedia.org/wiki/Heater_core

   If the climate control unit is automatic, actuators can also fail. Another possible problem is a leak in one of the connections to the heater core. This may first be noticeable by smell (ethylene glycol is widely used as coolant and has a sweet smell); it may also cause (somewhat greasy) fogging of the windshield above the windshield heater ...