Loud squeeking noise when air is on

Depending on how many miles you have had your belts for,it may be time to replace them altogether. If you had them replaced recently it may just be a matter of adjusting your air conditioning belt. Your belts have tensioners which can be adjusted. To the best of my knowledge, the spectra you drive should have an adjustment for this belt on the bracket which holds the ac compressor. This is located behind the engine between it and the firewall. Your best bet is to try reaching it from underneath. If you cannot safely lift the car using jack stands and blocking the wheels. You should consider having this done by a professional since the belts should be set to a precise tension level to advoid excessive wear or belt failure. If you attempt to tackle this yourself, just make sure you do not over tighten the belts. You can check them by pushing on them with your finger WHILE THE ENGINE IS OFF!!!! They should have about a quarter inch of give with minnimal pressure applied. Once you are certain they are not too tight you can do a visual inspection with the engine running. The belts should circulate smoothly without looking wobbly and make very little noise or none at all. Good luck with your problem and if this has been going on for a while, just go ahead and spend on the new belts. The squealing sound is an indicator that your belts are slipping on the pulley and friction is wearing them down constantly.