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I've driven Citroens all my life. Some of the cars from the 60's had an option of a manually operated flapper that closed air off going to the radiator. The air to the radiator and the rest of the engine compartment was via a somewhat sealed duct straight from the grill to the radiator. The flap was in this duct and was operated by a cable from the driver's seat. When the flap is closed the engine warms up quite a bit faster on a winter day. So, yes it does work. But in this case the downside was that if you forgot to open the flap the engine would overheat.
Rich
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