hey guys, my car has over 60k miles on it, never had any problems, but recently when i turn on the air conditioner, i hear a sqealing noise. the air is still cold, the belts look ok to me. never have had the freon checked> could it be low freon or god forbid, the compressor? my last 1998 civic lx air went out at 35k miles. warrenty covered that one. thanks