Starting to hear a high pitch whine from underneath the truck while in motion, then stops when vehicle stopped or rolling under 20mph.
Check the transmission oil level. That sometimes causes a whining sound.
Hope this helps.
It sounds like a Bearing is worn in one of the wheels or in the Drive-shaft. Get a mechanic to check it out
SOURCE: high pitch sound
Front wheel bearings. We have a 2004 Limited and ended up getting both replaced (at different times) paid for by Ford. We only had 40,000 km on the vehicle at the time and had to fight Ford to cover the cost. The did come through in the end.
SOURCE: Clicking noise under the glovebox
You may have a A/C,heater mode door actuator causing this. when this happens try all the different modes until it stops to see which one is causing this. I would start with temp. control first.
SOURCE: Whine/high pitch noise from under hood '00 Explorer
Sounds like your tensioner and belt are both going bad together and need replaced. The tensioner pulls the belt tight to hold enough tension for the belt not to slip, but the belt once it has slipped gets "burned" or slick and slips anyway. When the A/C is engaged it has alot of pull on the belt and slips causing the sound most likely. When belt is off check other bearings for noise to make sure that is your only issue. If one starts to go the others may not far behind.
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