Hah, I found the connector! Let’s call this a 50/50 user error and documentation error. User error is because unlike the orange/red and mixed wire connectors, the fan connector was pulled up snug to the sheath and the other two connectors were laying on top of it. Documentation error because the quick start guide doesn’t mention the fan. The part for connecting the wires says only “7) Connect the extruder assemblies’ 4-pin connectors: match the orange/red wire connector pair for the hot end and the mixed color wired connector pair for the extruder motor. Connect the matching pairs together so they lock and click.”
Had it mentioned the fan connector, I certainly would have kept digging. And there’s no mention of the built-in fan in the manual, either (other than notes that you can use a fan). This left me with the impression it wasn’t completely ready but required the user to finish the wiring.
There were a couple other issues (my bed heater socket in the electronics box somehow popped off its fasteners so I had to open the electronics box and hold it from the inside while I connected it from the outside) and the X axis rods had gotten bumped so that they were a good 5-10 degrees off level and required some real elbow grease on the right z axis rod to get it unstuck and level. But they were fairly minor and user-correctable.
Well, I’m excited to see if this solves the issues I’ve posted about with my PLA prints. If I use the posted TAZ slic3r profiles, will it handle the fan automatically or will I need to insert the gcode or add manual settings into slic3r myself?
Thanks for the response!