Do diesels need more heat to operate? How do they differ from gas engines?
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There is the belief that too much cold air over the radiator cools the engine too much, so they block a portion of the radiator to keep it from getting too cold.
I am not convinced that it is necessary. If the thermostat is working properly the radiator is automatically reducing the amount of cooling the engine gets.
Further, the air to air (it cools the hot compressed air from the turbo to increase the density of the air going into the cylinders for better performance) is mostly blocked, reducing its effectiveness.
I used to drive truck in the northern states during winters and I never blocked the radiator and never had any problems.
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