When does the cooling fan engage on a Duramax LLY?

When does the cooling fan engage on a Duramax LLY?

After towing for a few hours, I could very easily predict the behavior of the cooling fan. With every short hill I pulled, the fan clutch would engage for about three to five minutes near the top or after I crested the hill.

Why is my Duramax diesel engine not working?

The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.

Why is my Duramax LLY overheating at 50 mph?

The fan clutch on that old gasser would never engage at speeds above 50 MPH, even in the hottest ambient temperatures and towing the heaviest loads. Above that speed, there was always enough airflow over the radiator to keep the engine quite cool.

Are there any problems with the LLY Duramax?

In terms of LLY injector problems, GM had sorted out the internal failures with the 2004 ½ redesign, but the LLY Duramax would occasionally exhibit a trouble code for the injectors, but in most cases it turned out to be an issue with the injector harness rubbing through and causing a short or open in the wiring.

Are there any problems with the Duramax engine?

The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants. Not specific to one version of Duramax in particular (ex: LB7, LLY, LBZ, LMM or LML), the problem exists across all generations.

Why is my Duramax LB7 engine overheating?

The second potential cause of overheating on the LB7 is a dirty radiator. Naturally over time the radiator will pick up gunk, dirt, and various other particulates. As this happens, the effectiveness of the radiator decreases which can then result in overheating as well.

What causes a coolant leak on a Duramax?

The water pump has a seal on the side of it which is there to hold the pressure from the spinning shaft inside of it. From normal wear and tear over time the seal becomes defective and will cause a coolant leak.

What causes a water pump to fail on a Duramax?

Water pump failure is common across just about every Duramax out there. Unlike the LBZ water pump failure which is caused by the impeller being made of plastic, the LB7’s issues are caused by the coolant side seal on the water pump.