Yes, if he applied 12V to the clutch and it didn't engage then the clutch is either bad or need an adjustment. You can check it by putting an ohm meter on it and seeing if it is open or not. An open coil means you need a new clutch.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz

Would jumping the pressure switch omit a clogged dryer or expansion valve? A dryer and low pressure switch is a cheap purchase. I hope that it is not the compressor.
A

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1987 300SDL
187,000 miles