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I have same sound on my 2021 6.4 4x4, it’s the power steering. I think it just may be a characteristic of the truck. I have 50,000 miles on mine with no problems
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I posted on the other thread questioning this same thing. I saw that the heater core circuit on my 6.4 included the oil cooler. Looks as if it would require more elaborate plumbing than the Muzzy mod. I am with you, gonna leave it alone.
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I am interested in doing the Muzzi mod on my 2021 6.4 Hemi. At first glance it appears though that the coolant line leaves the water pump to the heater core and then circulates and back down to the oil cooler and from there it ties in to large hose that goes back to radiator. Seems like a valve...