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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