Vehicle fires usually start in one of three places:
1. The engine compartment, from fuel or oil leaks.
2. Under the dash, from electrical shorts.
3. The back seat, from lighted cigarettes.
Several different kinds of fire extinguishers are available. An ABC extinguisher is the most versatile and will handle type A fires (ordinary combustibles, like wood, paper, or the burning upholstery of a back seat where a lighted cigarette has landed), type B fires (flammable liquids such as oil or gasoline), and type C fires (electrical). You're best off with an ABC extinguisher.
The downside is the fine powdery residue an ABC extinguisher leaves. It will corrode electrical connections and will ruin computers and other electronic gear. You have to clean up thoroughly after using an ABC extinguisher.
To put out a fire, sweep the discharge from the extinguisher steadily back and forth across the base of the flames until the fire is out. Don't spray the extinguisher toward the flames that are leaping into the air - that won't do any good and just wastes the precious contents of the extinguisher.
If you have an upholstery fire in the back seat, smother the fire with the extinguisher, but then pull the back seat out of the vehicle. The fire will probably still be smoldering deep inside the seat. Open up the upholstery to extinguish the fire thoroughly.
Avoid using ABC extinguishers for fires around computers and other electrical equipment, if you possibly can. Halon is the extinguishing agent of choice. Halon extinguishers smother a fire by shutting out the oxygen, and work well if the fire is in a confined area. If there is a breeze, the Halon will be blown away, and the fire will flare up again. Under the dash electrical fires respond well to Halon, but you've got to disconnect the battery quickly after the fire is out, or the short circuit will start up the fire again.
Because of environmental considerations, the manufacture of Halon has been banned by the EPA, but previous supplies are still available and Halon extinguishers are still available.
So with that said, I thought I would start a thread to see what type of fire extinguisher are you using and why?