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.
Both a furuncle and a carbuncle are skin infections caused primarily by the bacteria Staphylococcus aureus, but there are significant differences between the two. A furuncle, also known as a boil, is an infection of the hair follicle and sebaceous gland, and appears as a pus-filled red inflammation.