Why Does My Air Conditioning Smell? Several things can cause an Air Conditioning System to smell. One of the things that can cause the Air Conditioning to Smell is a dirty Cabin Air Filter that needs to be changed. Another reason the Air Conditioning System can smell is the evaporator core can get dirty and grow mold in the evaporator. If your Air Conditioning System Smells, we can check the Air Conditioning System over and give you, our recommendation. We can use a BG product called Frigi Clean and that will clean the mold and dirt off the evaporator leaving your vehicle smell fresh and clean. We can service all makes and models of vehicles. We have a 1234YF machine and a 134A machine. Give us a call and let us help you with all your Air Conditioning needs.