Quote:
Originally Posted by Peter7307
Some trucks achieve a similar result by using a thermostat to control the opening of the grille slats ahead of the radiator.
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I remember being in stop and go traffic beside a large Autocar truck and its grill opened and closed with it's throttle. Every time pulling up 15 - 20' it opened, then closed while slowing or idling. Seemed pretty clever and this was even pre-internet.