Loud whine from under the hood

[Nay-Sayer]

I have a loud whining sound coming from under the hood of my 1993 Pathfinder. The whining sound mainly occurs when the truck is cold. After it's had a chance to heat up, the whining sound goes away.

 

Any ideas?

[Terrano1992]

AC belt tensioner or alternator bearings are most frequent sources of whine...

[Nay-Sayer]

AC belt tensioner or alternator bearings are most frequent sources of whine...

I was thinking it was the belt tensioner also.

 

Is this an expensive fix?

 

Thanks...

[Precise1]

Do you have a wife or GF stuffed under the hood?? Just checking...

 

The tensioner pully (AC?) is a source of noise but wonder why by the name??

 

It is not expensive, IIRC you can disassemble the unit and just replace the bearing pack. To check if it is that unit, start the truck and then spray some WD-40 or silicone spray into it to see if it quiets down for a bit. Be careful of the moving belts, spinning fan and general overspray though...

 

Can't hurt to check the For Sale section, or post in the 'Parts Wanted'

 

B

[adamzan]

Get a new one for around 20 bucks, if you need it.

 

http://www.rockauto.com/catalog/raframecat...p;parttype=6956

[GrimGreg]

Mine (AC tensioner) started squealing 2 years ago, I hit it with some PB Blaster and haven't heard a peep since.