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I wonder if they mean when braking and stuff they notice a slight dip in fan speed until they're no longer braking? Rather than fan speeds physically changing. I've noticed this exact thing in several cars before, but much more so in smaller engine cars, such as the Cruze. I attributed the fact that the brake boosters require a lot of power and it puts drag on the engine, which causes the fan speeds to surge.. especially noticeable if I have the speed over level 2.

If I'm totally way off base, then you can disregard, but I do totally experience this issue haha
 
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