I'm willing to bet money that you either do not have the correct thermostat installed or its stuck open.
I've never a driven a truck that didn't need fan pulling a hill in the summer.
Why I Never Plug The Truck In During Winter
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Burky, Dec 21, 2007.
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Also remember that we are in the prairies, so hills are an anomaly in this part of the world. One one run I do there is one hill, but if I take a different route to that same destination, the river crossing is a higher bridge, so no hill.
If I was pulling a fully loaded super B I would be worried if the fan didnt come on up a hill! -
I think I agree about the thermostats being bad. The truck should not even reach 200 if the cooling system is right. Even on a hill, whenever the temp jumps by at least 20 degrees, I would be looking real hard at the cooling system and trying to determine what is wrong. The thermosats on a Cummins are not hard to change, and I would get that done fairly quickly. If they are working right, they should hold the temp right at the correct mark, usually 170 or 180 degrees.
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Correction to my original post... its a Detroit, not a Cummins. Sorry for the confusion. -
I dunno...I think that 200 degrees is rather high and I don't even know much about the engines yet, lol. When you think of the boiling point of water is 212, and you're running at 200...thats pretty close. Granted, I don't know the makeup of anti-freeze and its boiling point, if its the same or not...but just as a comparison...200 is high. Considering that I run around 150ish and thats in western WY and Eastern UT where we have some hills. I run a Detroit 60.
Id be concerned if I was hitting 200 on the plains. -
I don't know of any engine that is supposed to be up at 200 degrees operating temp. Thermostats are designed to operate in the range of 160 to 180, and they never operate as high as 200. And I agree, there is little or no margin for error, since the temp is already up into the marginal temp range. There are several issues here, one of them being the oil breaking down from prolonged exposure to excessive heat. By running the oil that warm, it is going to be less effective at lubricating and the additives in the oil are much more lilely to fall out of suspension in the oil, resulting in wear problems.
A system is capable of going up to 200, even over, but they are not designed to go that high for prolonged periods. Something is wrong here, and it needs to be figured out before it announces it's presence the hard way.
You have a truck with a cooling system problem, whether it seems normal to you or not, and it needs to be solved before it costs you a big bundle of money. It could be thermotats, it could be a partially collapsed hose, it could be a bad gauge or a bad temp sensor. But there clearly is a problem, and it needs to be fixed. my 02. -
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I remember using old railroad track switch heaters, we used to slide them under the pans to thin things up, I still have some of thoes heaters in the shed i wonder if they are worth anything, I know the small RR in the quincy shipyard still uses thees heaters on their switches, But now I just program the APU to start up if the outside temp reaches 31 degrees, it senses the temp, starts itself heats the coolant and powers the block heater, charges the batteries, and heats the sleeper, it also has a 3000 watt inverter, Yes I am spoiled, and earned it, heck I didnt even ask for it, it was all just handed to me with the truck,, Sometimes I miss owning my own stuff and sometimes I don't
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Burky and Ziggy nailed this one!
My fan comes on at 185 and the check engine light and immenit shut down warning comes on at 205.
Constant 200 indicates a problem, even if its the gauge. -
I appreciate the concern. Thanks for the input.
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