EDIT
I looked up the stock fan calibration for a '04 Grand Prix GT2, 3.8L Series III/4T65E......
One very interesting thing about your car.....It obviously has cooling stack/air flow/frontal area issues as the fans are not disabled at speed.
Vehicles that have good air flow across the exchanger's usually have the fans disabled above 40 mph, Less efficient systems disable them at higher speeds (My Camaro is set a 60 mph)
Your vehicle's disable speed is set above the limiter (maxed out)!
I looked up the stock fan calibration for a '04 Grand Prix GT2, 3.8L Series III/4T65E......
One very interesting thing about your car.....It obviously has cooling stack/air flow/frontal area issues as the fans are not disabled at speed.
Vehicles that have good air flow across the exchanger's usually have the fans disabled above 40 mph, Less efficient systems disable them at higher speeds (My Camaro is set a 60 mph)
Your vehicle's disable speed is set above the limiter (maxed out)!
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