What is NOT a possible cause for a compressor clutch that will not engage?

The correct response identifies a closed high-pressure cutout switch as not being a potential cause for a compressor clutch that will not engage. A closed high-pressure cutout switch indicates that the system pressure is within an acceptable range, which means that it is allowing the compressor to operate. The role of this switch is to protect the compressor by preventing operation when the pressure is too high, but when it is closed, it signals that everything is functioning as intended.

In contrast, low refrigerant levels lead to a lack of adequate pressure in the system, which can prevent the compressor clutch from engaging. An open ambient temperature switch typically indicates that conditions are not suitable for the system to operate, which would also hinder clutch engagement. Additionally, a faulty compressor clutch coil would directly affect the engaging mechanism, leading to failure in clutch operation.