Quote:
Originally Posted by infinite-foamies
not 4x4, running rotella 5w-40. what would be a capacity for towing with an electric fan/eletric water pump? for my daily driving i dont drive long enough for the block to even get warm. havent tried the block heater yet, would preheating the block help?
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Too many factors for us to guess the capacity you need but remember that the cooling systems are typically very overbuilt - they plan for you to be towing the max load in the middle of death valley up a mountain. Basjoos, owner of "aerocivic", found that in his tiny car, the area needed to cool his car was something crazy like 2"x2". It's probably not quite a valid comparison, but if you need to burn ~9x as much fuel (10mpg vs 90mpg) while towing, I'd expect cooling area won't need to be too much more than 9x as large, which is still pretty small.
I have no idea if old diesels need to be warm in the same way modern gas engines do, but on my car I can see as much as a 50% improvement driving the same route and speed between a cold and a warm engine. In part, the computer is running a rich mix before warmup but I'm sure there are other factors that might be applicable to you.