I don't think that my gas engine will get any hotter than your diesel. It will produce more heat, but not get hotter. The cooling system should be more than capable (without a full grill block) of disspating the heat that the engine produces. As it is now, just turning my heater fan to the 2nd setting (of 4) basically stops the engine from warming up any further on the way into work at ~32F/0C. If I turned the fan up I know I can (because I have before) cool the engine down. This all changes once summer rolls around. So, I'll have to plan something for then.
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