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Old 02-11-2020, 01:43 PM
Machine Elf is offline
Join Date: Feb 2007
Location: Challenger Deep
Posts: 12,723

Why do diesel-powered vehicles need a windbreaker in cold weather?

In northern parts of the US in the winter (and I presume Canada as well), it's common to see diesel-powered vehicles with some kind of fabric shield across the grille, blocking most of the incoming air that would otherwise pass through the radiator. Is that wind blocker a solution in search of a problem? Can the coolant thermostat really not close down enough to prevent the engine from being overcooled while out on the highway?


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