First Interview. Issac Nielsen of Mahle Equipment talking about AC Systems. Current and new technology, coming changes in the handling of 134 refrigerant and correctly charging the system with a machine regardless if 134A or 1234YF Refrigerant. Ron takes a call from a listener in Va that wants to change the trans fluid on his wife’s Toyota. Ron closes out the hour with some last-minute thoughts from Issac Nielsen, who sent Ron a note post interview, with some additional comments about AC system service and following proper procedure. Visit us at https://www.cardoctorshow.com   See omnystudio.com/listener for privacy information.