Thank y'all. That bug, virus, or whatever this site seems to have persistently makes it hard to get on here sometimes. I appreciate your advice and will take a look at the AIC.

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'86 2.3L 5-Speed Supercab, dark blue; usually a daily driver for 22 years. Great truck but getting tired at 355,000 miles!
'08 2.3L 5-Speed Supercab, Pueblo Gold; just acquired, hope I get 350k out of this one!