Question about 2002 Cadillac Deville

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The northstar v-8 engine makes a loud wining noise for 10 min. than after heating up it stops.could this be a loose belt? or something worst. it has 101,000 miles

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If its a squealing noise it probably is a belt, check for oil residue or cracks , and belt tension

Posted on Apr 11, 2011

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do you have a northstar engine ??? my 97 did that too found bag smell in coolant tank turned out to be water running out tail pipe ,from head gasket , i hate giving bad news , but check everything water pump is a problem as well as drive belt slipping ,thermistate stuck ? do not try running without thermistate that will cause to overheat faster.make sure all air is purged out of cooling system , i hope something here is helpfull,good luck.get back to me and i'l see if there is any thing more ,

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Loud squealing noise

The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.

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