Yeah... pretty much what DT said. Do you have a lot of dusting on your brakes??
You might also take your pads out and get some anti-sqeal stuff to put on them... Also check and make sure its not the hub assy... mine was making a whining noise at 35mph and up... of coarse that was a whine more than a squeak/squeal...
Umm well... here is what I know about A/C. You push the button and cold air comes out and all is good. If not... roll down a window.
Ok but seriously, first thing I would check is any relays related to the A/C, I think there are, or is one in the fuse panel in the engine compartment, if you would like to know how to test them let me know and I will PM you or post it up here for general use. If all the relays check out I would check to make sure you have enough freon and oil in the system. If either of these are low it will cause the compressor not to click on. I had a similar problem with a Rustang (I hate Mustangs, just so everyone is clear, well except the new ones cause they are neato and fun to drive, and Saleens, and the original ones) and that is what it turned out to be. Charged the Freon in the A/C and everything was good. Other than that... I am still working on my A/C certification so I just know the very basics.
Ah yes the deadly windsheild Viper. Most common in areas with a rainy climate, such as Seattle or Portland, they have been known to attack many an unwatchful passerbye. This deadly snake likes to cling to winshields, and is most active during a torrential downpoar. They are also mostly motivated by the sound of a running engine.
They keydance method might not work for your car, I believe that the last year you could do that was 96 and since you have a 98 it won't work. If it doesn't you can go to your local *insert profane word here* Autozone and they will scan it for you for free and let you know whats wrong. If you are in the Portland, OR area (sorry didn't check your profile) I could come over and scan it for you as soon as I get my scanner back.'
You might try looking under the eclipses, I got mine there and they are sweet. I also have an eclipse so I know mine are right... if you don't find what you need there, you can go to www.speedhut.com and they will custom make them for you. They are a bit more spendy but also very cool. If you want to do it yourself let me know and I can post instructions to change the color of the backlighting, its pretty easy if you are patient.
Sorry, I ordered one in and it was wrong... it came UPS and had been opened and our application listing was wrong. He took his original to a dealership that told him they couldn't flash it until he fixed his fuel injector that was leaking or something because if he disconnected the battery it would wipe out the update. That is total horse puckey (or bull $#!%, whichever you prefer) so he took it to a different dealership and it took the upgrade. I would try another dealership first and see if they can get it to take, otherwise you will most likely have to get a new one. You can try Mitsubishi or Dodge, they should be the same but you will need to match the numbers off of your old one or it may give you problems. Good luck.