The squirls under the hood are fighting

[Big Bird]

So today I was driving home and I thought I had fighting squirls under my hood. Upon closer examination the sound seems to be coming from the pulley above the power steering pump. The pulley is connected to something that looks like a pump and has a big round disk attached to it.The sound is intermittent, but still worries me. Could it be a bearing going out that i can change? can someone tell me what it is? or am i completely wrong in my diagnosis? Please keep in mind this is a California truck.

[SMKSTAX]

That is your brake vacuum pump. If it's bad your brake pedal will be hard to push. Or it could just be the pulley it's attached to.

[REDPOWERSMOKER]

FIGHTING SQUIRRLS

[Big Bird]

I can actually see it moving side to side when it squeals. So there seems to be a bearing that is toast somewhere.

[BuickLeSabre1960]

yeah, your bearing sounds like it's going on on the vacuum pump. Mine did the same thing when it went out, except when I opened the hood the pulley flew past my head.

[97_stroke]

Mine just went out a couple weeks ago. Had to replace the whole vacuum pump. Cost me $461 at the dealer......

[FORD PARTS GUY]

I got one on the shelf p/n f6tz2a451aa 141.10 oe Ford with a warranty

[donald lorbeske]

boy it the month of vac pump there easy to rebuilb if yaall want the cheep way out bearing service or just autozone 120 buck no core

[97_stroke]

I would have done it all myself but i was out of town and had no other choice.

[Big Bird]

yeah well I pulled it out today and the front bearing had lost the seal on it. Not only that, but when i counted the bearings inside... there were only 4. glad I did it so soon and didn't put it off.