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Alternators can sometimes whine when start up on a cold morning, they run on full load till they get the battery back up to full charge. When the whining stops, switch on electrical equipment (Headlights, fan full boost, heated rear window) if the whining starts again its the alternator.
If it goes away after the engine warms up it is likely loose pistons or worn piston skits. As long as it goes away after the engine is warm it won't hurt anything. It is common on engines with some age on them. When the engine get hot the pistons expand and the noise usually goes away.
A whining noise when it is extremely cold outside is usually caused by the power steering pump due to the fluid being real thick at low temperatures. This noise usually goes away as the vehicle warms up and the fluid thins out.
It could be a pully bearing going bad, or your power stearing pump. next time you start it when it's cold try moving your steering wheel left to righ and see if there is any changes. The next time try removing your belt before you start it and see if the noise goes away. The belt could be warn out and hard itll it warms up and soften up. Start with a new belt. Good luck
who ever told you its the throw out bearing was wright. its an enclosed bearing so it does not run in any oil. if it only makes noise when it cold or sets for a while its common and dose not warrent taking it to a shop. all there going to tell you is you need a new clutch$$$$witch you do not need.
whinning sound not from the timming chain it would be a deeper noise alternator belt does that often belt loose and worn out when its cold slip on the pouly and finally grap when its warm if you have any other question ill be honor to help you im pierre from montreal hope it help fixya the post