If you notice this problem, you should also check for a dirty/clogged radiator and water pump failure (the latter is more common). Overheating could occur as a result of a fan clutch failure that impedes the ability of the engine fan to provide supplemental airflow needed to keep the engine from overheating. The latter versions received a fan and radiator to deal with this problem. Overheating is more likely to occur while towing in the summer months and is more prevalent in Duramax LLY and LB7 engines produced in 2005 and earlier. You might be one of those lucky owners that will never experience it or you might fall into the category that has to deal with it. Overheating issues are more like a hit-or-miss problem with Duramax engines. This problem is most common in the first Duramax engine, the LB7. It is quite difficult to prime the fuel system once the air has entered the system even when the fuel filter is changed. Due to this design, the fuel filter housing is more likely to develop a small crack or allow air to seep in due to a water-in-fuel sensor o-ring or bad housing o-ring. Instead, a higher pressure fuel pump is responsible for vacuuming fuel from the tank. The Duramax diesel engine is susceptible to air getting in the fuel lines which could be due to the fuel filter housing design and a lack of a lift pump in the design.
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