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active grille shutters
Look into all those vehicles to see if they have Messier variable-speed, electric water pumps.
These were in production as early as around 1991 on the small-block V-8 Cadillac, Roadmaster, and Caprice.
There would be sensors feeding signals to the ECU, which would modulate voltage to the pump. Shutters would need the same sort of electronic control, perhaps running in parallel.
And there needs to be a default, where the shutters fail 'open' so there's no chance to cook the engine.
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