Removal of the splash pan/air guide will give you great access to the compressor and clutch. Just use a feeler gauge to check the clutch gap, it should be around .020 or so. When the gap approaches .040, the electromagnet is no longer powerful enough to engage the clutch when the compressor gets hot.

There are many sources to re-gap the clutch in less than 30 minutes without having to remove the clutch and move shims. The 'bread clip' will not work for your S60, but using thin pieces of metal or reasonable gauge wire will work.

If this happens again, do not shut off the engine and test the clutch with a broom stick. You should be able to tap the center of the clutch with the stick and engage the clutch. Watch out for moving belts! It only takes a few ounces of pressure.