Thanks guys - I looked the code up and saw all the possibilities, but this newest funky issue is leading me to lean towards the water temp sensor being the issue. No way engine temps can go from dead cold to at temp to halfway between to cold again in two seconds, and same thing with the fan - fan turns on, temp doesn't plummet in a second or two.
I can't access the DL for the FSM here at work, but thanks much for the link - hopefully I can get it when I get home.
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