I'm going to presume you are talking about the motor driving the car's air ventilation and heating / cooling system inside the passenger compartment. Typically, it's located underneath the heat exchanger. Usually found right against the engine f...
A carbuncle is a cluster of boils, draining pus onto the skin. It is usually caused by bacterial infection, most commonly with Staphylococcus aureus or Streptococcus pyogenes, which can turn lethal.
A furuncle, also known as a boil, is a painful infection that forms around a hair follicle and contains pus. A carbuncle is collection of boils that develop under the skin. When bacteria infect hair follicles, the follicles can swell and turn into boils and carbuncles. A furuncle starts as a red lump. It may be tender. The lump rapidly fills with pus, and as it grows it may burst. Furuncles, boils, and carbuncles typically affect the thighs, armpits, buttocks, face, and neck. Individuals with weakened immune systems, adolescents, and young adults are more susceptible to furuncles than younger children or older adults.