Are you running XFI? If you are, you have to have the XFI turn on the second one.Well from what I've read and Peter has told me is that the fans are set up to kick on 1 at a time depending on your temperature so I used the big fan as my main 1 that kicks on 1st. Actually come to think of it I have yet to see the slim fan come on. Lol. The highest temperature I've sen my car get to is 190 degrees. So as of now for me I feel good with the 1 fan on but if it gets hotter in the summer then I will consider wiring them both up to work at the same time.
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