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the civic hybrid switches between being a 4 cylinder and a single cylinder engine by disconnecting it's rocker arms in a similar way as the v-tec engines work, with a hydraulic operated pin that slides to connects the two halves of the rocker arm.
Main reason pickup trucks have mechanical fans is that they are designed to spend alot of their life under load, so the fan would be running alot of the time any way, because trucks should not be used as passenger vehicles, they are utility vehicles.
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