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What you heard was probaly the drive belt, if it stopped after a few seconds, take a glss of water and pour on belt while running and see if it does it while pouring the water, this also works to tell if you have a bad belt or idler pulleys, if the squealing goes away its a belt if it keeps squealing its the idler. If its an actual whistle, before it starts, who knows......
The whistling is possibly the alternator belt loading to charge the battery, listen to the noise and turn on the rear heated screen and headlight, if the pitch of the whistle changes then it's the alternator belt. Hope that helps.
Spray same water on the belt to see if whistle goes out that means loose belt. 2nd remove belt and check shaft for any gaps in and out and up and down start for a minute to see if the squeaky noise cam from there.if is noise stop is your alternator bearings to Replace then fit the belt and adjust .
The engine serpentine belt may be worn or wet. The belt slips, causing a high pitched squealing or whistle noise. The other possiblility is a bearing beginning to go out on one of your belt driven components
hi ,,two things 1- water pump. but most likely check your pulleys they will make that high pitch noise one of them fixing to go bad and what will happen the belt will jam and jump lose and will lose all power ,,cause you have one belt for alt and the water pump mostly its the pulley right under the alt ,,hope this will help ....Joe
Troublkeshoot possible noisy idler pulleys, if they are OK, remove the plastic cobers & check for a noisy timing belt tensioner pulley. Water pumps rarely "whistle"; they grind. But, if you see any evidence of leakage at the weep hole on the water pump impeller shaft, replace the pump regardless. Might as well replace the timing belt whilst you are there, too.
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