Section 61-9-427 - Air-conditioning equipment - sale prohibited(1) Refrigerant not allowed to be used pursuant to 61-9-426 may not be sold for use in motor vehicles in Montana.(2) Motor vehicles and special mobile equipment with air-conditioning equipment that has refrigerants not allowed in 61-9-426, if installed prior to April 18, 2003, are not subject to any penalties provided for under Title 61, chapter 9.En. Sec. 2, Ch. 418, L. 2003.