Remove HTML markup from the text Freon, a refrigerant used in some air conditioners, is typically colorless and odorless in its natural state. When it leaks from an air conditioning unit, it may appear as an oily residue or form ice crystals around the leak area due to its low boiling point. If you suspect a refrigerant leak, it is essential to contact a professional technician for an inspection and repair. The HVAC Alliance Expert team is available to help with any issues related to cooling and heating systems.