>> Does the AC compressor have a clutch and if so what happens to the noise
>> if you turn the AC on/off?
Good question.
Probably worth a bit more time tracking the source of the noise unless you are sure it's the pump. The last jingly noise I had preceded the falling apart of an idler pulley bearing on the Scorpio. Of course I thought it was one of the proper components the very serpentine belt went round.
If you can get a long screwdriver to the suspected pumps as a listening stick you might be able to confirm or eliminate them as the cause.
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