I drive a diesel at work and I've seen gasoline engines warm up completely in 10-15 minutes. Our diesels, while being driven, not idling, take 30-45 minutes to warm up. Why does it take so long? They are Mercedes 5 cylinder engines.
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Alot of it has to do with the fact that most diesel trucks have a very large cooling system. More coolant equals longer time to warm up. Also could be there is a bypass for the radiator on the motor. The bypass allows water to circulate through the engine with out waiting for it to come up to temp for thermostat to open. It is a safety measure in case the t-stat fails closed so that their is some coolant circulating.
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Try plugging them in overnight. They remain warm and function much better.
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Two things, the first is that the diesel is very efficient. When Rudolph Diesel designed his engine he didn't include a cooling system, he didn't think it would be necessary.
Second, maybe you have a failed thermostat. My f-250 diesel needs to run with a coolant temperature of 195F or it doesn't run right, to achieve that it has a thermostat that stops coolant from reaching the radiator until the temperature rises and the thermostat opens. Iam having exactly this problem right now, I'm changing the fuel filter, air filter and thermostat tomorrow.
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If it takes 30-45 to warm up when your are driving maybe you should check to see if the thermostat is stuck open.
most diesel take about five to ten minutes to hit about 150 degree or so then after driving about ten minutes is up to normal running temp.
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