Humming above 2800rpm

[benz88]

alright starting today i get a humming above 2800rpm. Its sounds like a jet plain hum or a giant fan hum. Gets louder as the revs go higher. Eventually around 3500-4000 the belts start to squeek. Does this hum mean time for new accesory belts?

[sx moneypit]

Fan clutch locked up?

[benz88]

Fan clutch locked up?

nope it spins.

[sx moneypit]

If your belts are squealing you either need to adjust them or replace them. While you have them off (if you replace them) you need to spin your water pump,AC pulley,idler pulley and power steering pulley to see if you have any noise issues with them.

[benz88]

ok thanks! I just soaked them in WD-40 for now to see if that does the trick.

[sx moneypit]

No problem.

[Klits562]

the fan clutch could still be locked up in a different way. The clutch is spose to "slip" when the clutch gets warm or cold(i forgot wich) to slow the fan without slowing the motor so that your car can keep its opperating temp, if the clutch isnt slipping the fan will spin as fast as the motor is going and the fan will make a kind of humming noise.

Also this might be causing your belt noise if the fans spinning to fast the increased drag could be slowing it down while your belts are still spinning faster causing them to slip on the pully.One way to check your clutch is turn the car on with the hood open and listen to your fan, it should roar then die down, if it doesnt die down then its locked.

[benz88]

I sprayed it with WD-40 yesturday and the noise went away. Time for new belts.