What should I do if my Duramax engine overheats?

The bulletin applied to all 2004 and 2005 LLY Duramax engines. GM’s solution retrofits the new-style LBZ air intake to the LLY engine. I had a difficult time getting my mind around how a change in intake systems would solve an overheating issue. As a result, I did not pay much attention to the bulletin.

Are there any problems with the GM Duramax?

In stock form and even when substantially modified, GM’s legendary V8 diesel can provide hundreds of thousands of miles of trouble-free use. Still, and just as we exposed the shortcomings of the almighty Cummins, the Duramax isn’t without its flaws—some of them catastrophic.

Can a GMC one ton engine overheat?

But I had experienced better: that 1980 GMC one-ton. It never overheated once, under any condition. I was already aware of a GM service bulletin (06-06-04-036D) addressing overheating in extremely hot ambient temperatures. The bulletin applied to all 2004 and 2005 LLY Duramax engines.

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.

What causes a Duramax to overheat in the summer?

Overheating typically occurs while towing in the Summer months, and is most prevalent in 2005 or earlier models (2006+ models received a larger radiator and fan). Overheating often occurs as a result of a fan clutch failure, preventing the engine fan from providing supplemental airflow as necessary to keep the engine from overheating.

Are there any problems with the Duramax diesel engine?

Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.

Are there any problems with the Duramax water pump?

This seems to be inherent of the factory water pump design. Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.

How does a Duramax LLY keep its engine cool?

She was fully-loaded with air conditioning. 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.

How much horsepower does a Duramax LLY have?

My first experience towing with my 2005 LLY Duramax was a thrill – and a disappointment. In stock form, other than some gauges and a power program that added about 100 crankshaft horsepower and roughly 180 foot-pounds of torque, there was no disappointment with the power – it was awesome!

Why is my Chevy Silverado overheating so much?

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What’s the temp on a 2004 Chevy Silverado?

Ok, my ’04 Silverado has not given me a lick of trouble…..until now. It red lined on me a couple days ago. I cought it before I lost any fluid. This happened not too far from my home, so I cracked the hood, threw on the heater and continued home. Doing the above, I got the temp down to about 230-235 degrees.

What should I do if my Silverado truck is overheating?

Fill the radiator with coolant and allow the truck to run for 20 minutes. This will determine if the coolant level is low, causing the truck to overheat. Use extreme caution when working with the coolant system. The coolant is very hot and builds pressure which could be hazardous.

What causes the alarm to go off on a Chevy Silverado?

If you use one of the power door lock switches in your vehicle with the door open, you will automatically trigger the alarm. The same is true when using your remote keyless entry transmitter.

How to troubleshoot a Silverado engine overheating?

Troubleshooting your coolant system, when the problems are minor, will save you time and money in the long run. Allow the truck 30 minutes to cool down. The coolant system will be under pressure when it is first turned off. Open the hood to access the engine compartment. Locate the radiator in front of the engine compartment.

What causes a diesel engine to overheat when there is no coolant?

If the coolant is too low this can allow pockets of air into cooling system. When air gets into the cooling system it will cause a reduction of coolant flow due to the presence of air bubbles. Air flow alone isn’t going to get the job done to keep engine temperatures constant.

Why is the shunt line on my diesel engine overheating?

The shunt line prevents pressurized bubbles forming from the water pump, also known as cavitation, by providing a constant flow of coolant. When there is an abundance of boiled coolant in the system it pushes the coolant to the surge tank and into an overflow area called the expansion bottle or tank.

Why does my Duramax diesel engine keep overheating?

I and 3 friends with duramax diesels are having same issues. The top radiator hose is collapsing ,preventing flow of coolant to engine. Replacing hose seems to fix problem for a while but need to figure out why the hose is collapsing when engine is under heavy load ,pulling trailer up long grades.

What should the temperature be in a Duramax LLY?

I noted on my digital gauges that the engine temperature was running between 198 and 220°F, a significant jump from the typical 190 to 194°F when running empty.

What causes an engine to overheat in high humidity?

High humidity will also put more stress on an engine’s cooling system. When temperatures and humidity are high there isn’t enough difference between the outside air and the coolant temperatures. Engine lugging is a running condition in which the load applied to the engine is too large for the engine to handle.

What should the engine temp be on a 2004 Chevy Duramax?

My 2004.5 with 120k mi.fan clutch cycles very frequently also. Pulling a 8100 lb 5th wheel up a hill in the summer heat with a/c on. Temp gets to apx 235. Dash comes on and reads High coolant temp. It did it in 2019. I then replaced the fan clutch, waterpump and all coolant hoses.

What should the engine temp be in a 2004.5 LLY?

Just got a 2004.5 LLY and have a question on the normal running temperature. Seems to be the average temperature is the half way mark between 210 and the far left mark. If I go up a large hill the engine will get up to 210 and stay there for a little while after leveling off the hill before settling back down to that middle notch.

How to keep my truck from overheating when towing?

The fan always pulls the coolant temps down but the intake air temps keep slowly rising. I have tried everything suggested and more. I am installing a auxiliary cooler and be done with it. At high loads, the radiator isn’t big enough and there isn’t enough room to install a bigger radiator.

What should I do about my maxxtorque overheating?

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. To improve my lot, I got into the habit of running every hill: accelerating before the base of the hill and backing out slightly as I climbed. It did not help much.

What kind of car is a 2008 GMC Duramax?

Friend is looking to buy a 2008 GMC Duramax 2500 crew, 4×4 auto. Are there any problem areas that he should know about? Thank you for the input is here and there.

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.

What should I do if my Duramax engine overheats?