The coolant valve is computer controled so the temperatures will vary. I have found mine as high as 226 then settles down to 210 range. It has never gone over that temp.
Use SAE 5W-30 viscosity grade engine oil for the 2.8L Duramax diesel engine. Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −20°F (−29°C), an SAE 0W-40 engine oil may be used. An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures.
The LLY suffered from overheating. When Duramax incorporated the use of the EGR cooler, the cooling system of the engine was not upgraded. When towing with the LLY up steep grades on a hot summer day, owners often noticed that the cooling system could not sustain the engine’s temperature and would overheat.
† Protects all cooling system metals while providing excellent high-temperature aluminum protection † Meets and/or exceeds the following industry and engine specifications: GM1825M, GM 1899M, Ford ESE-M97B44-A, Chrysler MS 7170, ASTM D3306 and D4985, SAE J1034, J814C & J1941, TMC of ATA RP-302B, Federal Specifications
Oct 13, 2016 · This isn't particularly a duramax issue as I think all NBS rado's are effected. Here's the deal. Truck got to 210 the other day and that never happens. This is by going on what the temp gauge is saying, did all headgasket tests and it passed all of them, no bubbles in reservoir tank, rad hose is soft.
Dec 15, 2008 · Intake air temperature, engine coolant temperature and turbocharger vane position data would give a pretty accurate picture of just how well the new LBZ air intake worked compared to the LLY version. I set up the truck with the same tow tuning and fifth-wheel trailer that I used during my initial overheating experience on Killer Hill.
Dec 12, 2011 · The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the VCM. The VCM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes.
Upgrade your Duramax cooling system with the Mishimoto 6.6L Duramax Silicone Coolant Hose Kit for the perfect combination of performance and durability. Mishimoto diesel coolant hoses are manufactured with high-grade silicone and five layers of heat-resistant embedded fibers to provide increased pressure and temperature tolerance.