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The old Packards had adjustable fins in front of the radiator that opened and closed depending on coolant temperature, a variable grille block. I think VW and maybe BMW as well as the newer Ford Focus (and I'm sure several others) have thermostatically controlled radiator blocks that adjust to maintain a consistent temperature of coolant LEAVING the radiator. In winter when the thermostat restricts the flow of coolant that same coolant spends more time going through the radiator. Combined with much lower ambient temperatures you have much colder coolant re-entering the engine, which absorbs more heat than coolant that is 60+ degrees warmer in the summer.
regards
Mech
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