When performing engine preheat for refrigerant removal the technician should do?

When performing engine preheat for refrigerant removal, the technician should ensure that the engine is at the correct operating temperature to facilitate the proper vaporization of the refrigerant. This typically involves running the engine for a specified time while monitoring the temperature. Additionally, the technician should ensure that all safety protocols are followed, including the use of personal protective equipment and proper ventilation, to prevent exposure to refrigerants. Finally, they should utilize the appropriate recovery equipment to safely capture and dispose of the refrigerant.