I'm new here too am interested in the same. We have an overheating issue that I think is due to the second fan not coming on. It's okay until we stop in traffic. I took it in to a shop yesterday and was told the fans were bad, but tested them today and they're both good. I also tested through the module and one fan comes right on and the other one turns a bit so it's getting juice through the module.
Is there a temperature sensor or does the module have some kind of thermostat in it? I ordered replacement fans which of course don't fit in the housing properly so I'm returning them so while I had the housing out that's when I tested the fans. What else is there?