Today, the A/c clutch started making this metallic clunking, clanking sound. Makes the sound only while the A/C is off. Goes away when I engage the A/C. I figure it is about to go. Anybody have any DIY instructions on how to change it? Is there anything else I should purchase for the swap besides the clutch assembly? O'Reilly Auto Parts has an O'Reilly/Murray new one for under $100 at my local store.