If both sides are 110psi and the compressor is turning you have a bad compressor. .

The compressor is a variable displacement. The stroke of the bore and stroke is altered by varying the angle of the wobble plate. That is accomplished by a POA valve. The point being to limit compression to keep the low side from dropping below the point where water freezes.

The later variable disp compressors spin all the time and are controlled by a solenoidinto the control of the wobble plate. Your compressor should still use a clutch.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician