Technician A says a bad clutch coil could cause the A/C clutch not to engage, while Technician B says a bad clutch coil ground could be the cause. Who is correct?

A bad clutch coil can indeed prevent the A/C clutch from engaging, which is what Technician A points out. The clutch coil is responsible for electromagnetically engaging the clutch that connects the pulley to the compressor. If the coil is faulty due to a break in the winding or insulation failure, it won't generate the necessary magnetic field to close the circuit, preventing the clutch from engaging and, consequently, the compressor from functioning.

On the other hand, Technician B correctly identifies that a bad ground for the clutch coil can also result in the same problem. The ground connection is crucial for completing the electrical circuit. If the ground is compromised—due to corrosion, a loose connection, or wiring issues—current may not flow properly through the coil, which would similarly lead to the clutch not engaging.

By recognizing that both a failed clutch coil and a bad ground can independently result in the symptom of the A/C clutch not engaging, both technicians are providing valid insights into potential causes of the issue. Therefore, the correct response encompasses both scenarios as relevant explanations for the problem presented.