Pulley Squeal?

[Mamby]

Whenever i start my truck up it usually squeals for about a second then it stops, but now, it does it when im driving. I dont think its the belt because ive put belt dressing on it. I think it might be a pulley bearing? any ideas?

[ccz145a]

it's the belt. get a new one... dressing never works for long.

[VileZambonie]

Ditto, never use dressing, just replace the belt.

[HAULIN IT]

Mamby, Yes, change the belt. Also run a piece of 180-220 grit sand paper on the pulley grooves. If the vehicle has been sitting for a little while, a minimal  rust build-up can form on the exposed parts & cause the squeal. Lorne

[Mamby]

ah, found out what it was, alternator belt was loose, go figure, the only belt i didn't check.

[the_legend_1981]

Same thing just happened to me

[Stewart G Griffin]

i just went thru this ordeal 2 months ago;

Not only get a new belt, but get a Gates belt;  That Dayco stuff won't cut it.

Please refer to this thread regarding my plight:
http://forum.73-87chevytrucks.com/smforum/index.php?topic=5454.msg26521#msg26521

[Stewart G Griffin]

UPDATE:

Ok, i see it was that the belt was loose.   Anyways, i feel my thread is good reading anyways.

[78 Chevyrado]

Clean the pulleys, sometimes they get oil on them that never goes away on it's own.  Loose will do it too