Squeaking sound Turned on the AC Unit first time in the season and the propeller makes a constant squeaking sound.

Possibly low fluid in the power steering system. Check the level.
It could also be the drive belts for the power steering so they need to be looked at as well. If they are slack, tighten them up a little.

If it is making a squeaking sound then the sound would be constant, more of a whistle. If there is a squeaky noise coming from the unit it is likely to be either a loose bolt or a perished seal or rubber in the valve.

Squeaking will be constant if pulley bearing is bad, Try belt first

Hi,
Here is a tip that I wrote about dryers and noises...
It will help you determine what is happening there...


http://www.fixya.com/support/r4416566-dryer_repair_squeaks_grinding_clicking

heatman101

Repair pix

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

well the belt could be loose or the compressor may be seized.....or the belt may be old and squealing.

Propeller (or driveshaft) will transmit noise check the joints at both ends for binding or rust (best done with it out of the car)

please replace felt around drum thank you for useing fixya RATE ME

Post your make and model please. Sounds like the rear drum bearing is dried up

the ac belt is sperate from the power steering belt.. sounds to me you need to replace the belts (both of them) but theres a idler pully in the middle of them all witch may have a bearing going out on it..i had to change mine at about 85,000.. when i had the belts off i spun the pully and it was excessivly stiff cause'n slipage and also a squel.. hope its not the alt, or water pump making the noise..they can run ya into some $$