I can still offer some general guidance.
In a refrigerator, the evaporator coil is a vital component responsible for cooling the unit. If there's an issue with the coil, simply making it colder won't solve the problem. An evaporator coil problem might include issues like refrigerant leaks, frost buildup, or improper cooling due to a malfunctioning part.
An electrician typically deals with electrical systems, circuits, and wiring, and they may not have the expertise to repair or diagnose issues related to refrigeration systems. To address problems with the evaporator coil or any other refrigeration components, you would need to contact a qualified appliance repair technician or a refrigerator specialist.
Repairing or replacing a faulty evaporator coil is a complex task that requires specialized knowledge, tools, and safety precautions. It's best to leave these repairs to professionals with experience in refrigeration systems to ensure that the issue is properly diagnosed and resolved without causing further damage to the appliance.