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Advanced Tuner
Solstice Tuning warning
Based on my experience when tuning the 2.4L solstice, it is highly important that you are careful where you set the fans to come on.
If you lower the fan temperature too much you will have an adverse effect on the cam phasing, and cause the car to stop displaying engine temperature, along with reduced gas mileage. This came as a result of lowering the fan temps to even 190*, so please be careful.
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Tuner
This would probably to any and all LE5's as well. I have my fans on all the time, with no adverse effects. Temps are steady at 190, and are lower under a hard load.
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Advanced Tuner
I have not seen the saem behavior out of the other LE5 cars
(cobalts) that I tune, just the Solstice for some reason.