Looking at your bin with HP Tuners a couple things I see. First is you have the Fan 1 and Fan 2 turn on temps set to the same temperature. But that is not what is causing your problem. Lots of GM vehicles that didn't come with E-fans have the output pin that would control Fan 2 set to perform Auto Air Re-circulation. HP Tuners has the ability to switch that output to Fan 2 control. Here are some screen shots of your fan settings and how HP Tuners allow you to reassign that pin. See if whatever you are using to edit your bin has that ability. If not I can load your bin in a PCM and read it back out as a bin. HPT does not allow saving as a bin but I have other means of reading it back out as a bin.
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