Had a problem with my fan not coming on, narrowed it down to the ccrm. got one out of the junkyard, from a mercury sable (works fine) for 10 bucks. Anyway, I wanted to see the inside of this thing, thought I'd share. Cut the case off, then the tops of the relays, if you look close at the second relay you'll see ~2mm gap at the end of the coil windings. That piece was melted and out of place, not letting the relay arm close, no power going thru, no fan coming on. So here is the inside of this elusive black box.
something else...I'm not an electrician, but i dabble in the stuff with my work...I put 12v on one of the posts and ground on pin17 (the fan switch mod) and the relay tried to close...just a heads up for you guys switching your fan on manually. I used the fan switch, and I'm assuming that is the root cause here, overheated and melted. Not 100% on that but, makes sense to me. good luck