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Dodge Durango increase noise from under hood all by itself

I’ll be cruising along, say on the interstate, usually in very warm temps, when the noise from under the hood will increase by itself; it sounds like an increase in engine RPM, but there is no increase on the tachometer. After a few minutes, it may return to a “normal” sound.

Is it possible what you’re hearing is the electric (or clutch-driven) cooling fan coming on?

What you’re hearing is the fan clutch engaging when the temperature off the radiator reaches a certain point. Normal.