As best as I can recall what frogs sound like -- we urban dwellers are at a bit of a disadvantage there -- it would seem to be a non-mechanical sound.

However, from memory of my last SD, which was a complete POS which made a new sound each week, I can imagine a belt, a squeeking pulley, a power steering pump (either low on oil or on the way out), internal noise from an alternator, or yes, a fan rubbing against the shroud.

Is this a transient or momentary sound when you put the car under load, or does it sound off the whole time?

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22