I believe mine is going bad on my 2004 Ranger. Right after startup, I get a short lasting loud growling noise coming from the A/C compressor. I see rust colored dust on the front of the pulley. My local NAPA store can get me a new one for just under $100. Will I need any special tools to swap it out? Anything I should know before doing this? Does anyone think it is something else that is the real problem? Thanks in advance!!!