Do ABC fire extinguishers cool down?

ABC fire extinguishers do not specifically cool down; instead, they work by smothering and interrupting the chemical reaction of a fire. The extinguishing agents—usually monoammonium phosphate, sodium bicarbonate, or potassium bicarbonate—act primarily by displacing oxygen and forming a barrier between the fuel and the flames. While the discharge may have a cooling effect on the fire's surface, the primary function is to extinguish the fire rather than to cool it down.