Cold High Pitch Whine from engine area...
I'm hoping someone else has had this problem...
I have a '99 323i E46 Sedan (M52 motor) Automatic. The car & trans. have 180,000 on the ticker, and the motor maybe has 110,000. When it's cold out (pretty much all the time now), as I accelerate through the gears (in D)there is a high pitch whining noise that seems to be coming from the engine compartment. It will slowly die off and go away as the car gets warmer. It really sounds very similar to a power steering pump that ran dry. If it's really cold, it doesn't seem to fully go away. The noise also changes directly with engine RPM, although I tried a free-rev once out of gear, and it didn't seem to do it, although after I put it back in gear and took off, the noise wasn't there anymore either. It's loudest under acceleration, quietist when I let off the gas.
The trans. shifts fine. (Although a little jerky until it warms up). No lights on in dash, engine runs fantastic. Full synthetic 5W-30 changed religously every 5,000 miles. The viscous fan is not siezed. No coolant leaks. The power steering system doesn't leak a drop, and the noise has absolutely no change when I turn the wheel (going around corners).
Could this be pulleys? Belts? Water Pump? Trans?
Any help/input would be GREATLY appreciated.
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