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Maybe I am not understanding what your trying to say here " It drove fine to work today. I got in it to go to lunch and noticed the fan motor was blowing air out of the vents. Strange" Are you saying the blower was running, but the key was not turned on?
Most often the no speedometer and flashing OD light is a sign the rear axle speed sensor has failed. Was the vehicle wet from rain or a car wash yesterday or today?
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Can you remove the fuse box and GEM module on the back of it near the drivers left shin. Take them aparta nd see if there are signs of water, rust, or electrical arcing. If so they need to be replaced, programmed and the windshield removed and resealed.