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My 2000 odyssey started making a whining noise right after starting. The noise was associated with the rpm of the car.
Not associated with the air conditioning or heater being turned on or off, or with the speed of the car when coasting.

Then suddenly after a short test drive and restart it disappeared and now won't come back.
I was driving on a dirt road earlier before it happened.

Could it be the serpentine belt?
It didn't sound like a bearing, more of a multi toned whine.
 

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Possibly a power steering leak. The suction line can leak allowing air to be sucked into the system. The pump will make a fairly loud sound as it tries to pump foamy fluid instead of solid liquid. One way to check is to look in the reservoir and check if the fluid looks foamy. There are other posts that address it if it is the Power steering
 

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Could be the alternator.

Temporarily remove the power steering belt. If the noise persists, it's something other than the pump.

Replace the PS belt and then remove the accessory belt. If the noise disappears, it's likely the alternator.

Belts don't usually make a whining noise. However, this would be an ideal time to replace them if they are anywhere near due, especially the accessory belt which is more difficult to replace than the PS belt.
 

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Instead of removing any belts, use a broomstick or very long screwdriver or pipe and SAFELY touch it to the housing of the alternator , power steering pump , etc and see if you can locate it.
Most likely, it is the alternator. (Probably in need of new brushes)
Startup takes a lot of battery 'juice' which cause an alternator to work harder, esp if your battery is getting on in years.
Buffalo4
 
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