Final answer:
Option 4. is correct. Technicians servicing an MVAC system should perform all the listed activities, except using proper safety equipment, which is a safety guideline and not a maintenance task. Regular maintenance is crucial for system efficiency and health considerations.
Step-by-step explanation:
The question asks about the activities that technicians servicing an MVAC (motor vehicle air conditioning) system should perform, except for one that is not recommended. The tasks listed include checking for refrigerant leaks, cleaning or replacing air filters, inspecting and cleaning the condenser coils, and using proper safety equipment. All options except the use of proper safety equipment are maintenance tasks that should be carried out regularly. Using proper safety equipment is not a maintenance task, but a safety guideline that should be followed at all times. Hence, using proper safety equipment is not the action to be avoided; rather, it is crucial for the safety of the technicians.
Regular maintenance, including cleaning the air conditioning system, is essential to prevent the growth of biofilms and all kinds of pollutants. Technicians should always ventilate the work area and follow the manufacturer's instructions when working on MVAC systems. As part of regular maintenance, changing filters regularly to trap dust and other pollutants is essential. The proper maintenance of air conditioning systems can prevent potential negative consequences on both health and the environment.