4th trip in motorhome climbing in elevation outside temperature 85 degrees periodically had LOUD howling sound like a large electric fan turned on would last a few minutes then stop. not sure but seemed like a minimal loss of power. Did not happen when not climbing in elevation We went to Death Valley from northern Calif and never had this happen but outside temp was not as high then.
Sounds like it is operating as it should. You have describe the Engine clutch fan operation perfectly.
No worries with this one, great question though.
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