Reading this thread has been very helpful, but I have a question about my specific problem and maybe someone can help. My old fan assembly clearly had 1 fan that was burned out. I replaced it with an O'Reilly fan assembly, but the engine is still overheating at idle, and the A/C blows warm air. So the same symptoms as most others in this thread, and maybe exactly the same problem as Ryan (quoted).
Both of the fans spin, but obviously something is wrong. Is there any way that I can easily highlight a problem with the O'Reilly fan and order a new one from RockAuto (I had never heard of them, and the Motorcraft fan is the same price as the O'Reilly fan was)?
Of course, I'm hesitant to drop 260 on the Motorcraft fan if there could be another problem elsewhere. I can do some engine work but not great with electric. I am piecing together some OBD today, but I'm not sure there's anything in there that will pinpoint the problem.
