There are two tests you can do. With the engine off and cool turn the center part of the clutch pulley by hand to make sure the compressor is not frozen.
Unplug the sensor and locate the wire on the compressor clutch housing that powers the electromagnet on the clutch. Using a jumper directly power the clutch and listen to see if the clutch is making any clicking sound. You do not need the engine running to test this. You might want to loosen the fan belt so that the entire clutch pulley can be rotated by hand.
It is possible to run the compressor for a short time with the engine running just to trouble shoot it. Some sensors only lock out the compressor if the pressure is too low. Other sensors are both high and low limiting and will also lock out the compressor if the pressure is too high.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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