San Francisco—Canada’s auto safety regulator said on Thursday it has opened an investigation into the heating system of Tesla Model 3 and Model Y vehicles following 16 consumer complaints about its performance during cold weather. Transport Canada said it is concerned that a malfunctioning heating and air-conditioning system “may affect windshield defogging/defrosting and therefore driver visibility.” “A company is required to notify Transport Canada and all current owners when they become aware of a defect that could affect the safety of a person. … These notices are commonly referred to as ‘safety recalls,'” it said. The regulator said it has informed Tesla of the investigation. Tesla did not respond to a Reuters request for comment. In 2020, Tesla CEO Elon Musk tweeted, “Model Y heat pump is some of the best engineering I’ve seen in a while.” A number of Tesla owners complained that the heat pumps are failing in …