Depending on who you call and where you located, labor is usually 15-60 dollars an hour, depending on the mechanic and his or her qualifications. For instance, I own a Nascar engine shop, I charge 120 an hour.
To repair the R&R heater 2001 core in a Mitsubishi would really depend upon who you call or where your location is, and also who you choose to work on it. Time would vary from 6 hours to 7 1/2 hours. It would also include service to the air condition system.