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When it acts up does it sound similar to a jet engine noise? If so then check the coolant level in the actual radiator, not just the overflow. Oftentimes the overflow will be full and the radiator will be low. If it is low then from under the vehicle look at the two radiator mounts for any dried coolant. It will be a tan color. If any evidence of dried tan colored crusty residue on the mounts then using a flashlight look through the radiator fan at the inside of the radiator, they usually leak very slowly along the edges on the fan side of the radiator. If OK then check the thermostat housing for leaks. Look for any tan crusty residue where the housing bolts to the cylinder head and also down in the valley under the intake manifold.
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Was the engine hot or cold when you checked? When the revving occurs is it a fan rushing jet type noise?
If this is a fan rushing jet sound noise (asked twice with no response) its either from the engine running too hot or the trans running too hot causing the electronic fan clutch to ramp up and the shift points to be extended in attempt to cool the engine/ transmission. I would still inspect the areas I mentioned for coolant leakage. There could also be an air pocket trapped in the cooling system. At this point, both the engine and transmission temp will need to be monitored at the time of the fault occurring. Either with a generic scanner/code reader that can display engine data or dealer installed flight recorder.
Temp gauges very inaccurate on these also, don't move from normal until almost overheated.
Fan clutch replaced for this same concern?
OK so somebody heard a roaring type noise that led to replacing it. If there are no coolant leaks then more than likely the transmission is intermittently overheating,.
Restriction in the trans cooler, torque converter lock up clutch slipping slightly, clogged fins on the trans cooler or radiator restricting airflow.
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