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Originally Posted by Duke2.6
Thirty years ago most cars had fixed engine driven fans. Warmup is controlled by the coolant thermostat, not the fan.
Bottom line is that there is no ill-effect, other than more engine noise and a slight loss of fuel economy that you may not even notice unless you track fuel mileage very carefully.
Duke
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Warmup is controlled by BOTH, the thermostat and the fan. The thermostat doing the job of controlling the amount of coolant flow, and the fan controlling the temp drop of the coolant. A fan running 1:1 when cold will delay the warmup cycle. Also, what would be the purpose of designing a viscous-clutch setup if it had no effect on cooling performance? Perhaps the worst result would be a delay in cabin heat. The cooling system (obviously ) is designed for each car. For example, simply chucking a viscous fan setup for an electric fan can be a challenge because of the hysteresis of the electric sensors and create higher than desired stress in aluminum engines. Also,