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Just wondering how hot will the eng. get before the idiot light comes on? when I pull my fifthwheel in the hills my truck runs hot I will let it go up to 225 before I pull over and let it cool back down, but the idiot light never comes on. it does come on at start up so I know the light works.
Diesel engine coolant temperature at the top of the radiator where hose attaches after high rpm or under load condition for 20 minutes should be (195-237*F) 91-114*C nice time to have a temperature reading point and shoot tool.