C-24.2, r. 32 - Regulation respecting safety standards for road vehicles
71. The heating and defrosting system shall comply with the following standards:
(1) the radiator and the blower and vents designed to heat the passenger compartment and defrost the windows shall be adequate;
(2) enough air shall be blown onto the windshield where intended by the manufacturer and onto the side windows if the vehicle has vents for that purpose; an auxiliary fan may be used; and
(3) if part of the heating liquid piping is visible from inside, it shall not be cut, cracked, worn or leak.