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Travel_glampers's avatar
Travel_glampers
Explorer
Feb 06, 2020

2009 Silverado 3500 HD Duramax LMM overheating

I have the above truck towing a 14,000 pound fifth wheel. When the truck was new, it overheated going up to Eisenhower Tunnel (11.000+ feet) in June. Both the engine and transmission (Allison) tempe...
Tow Vehicles
Grit_dog's avatar
Grit_dog
Navigator
Feb 07, 2020
Good luck diagnosing an issue that happened once 10 years ago and never since.
There's nothing wrong with your truck if it hasn't overheated the last 10 years.
And since it was brand new then, there was probably nothing wrong with it then either.

Hard to believe the fan clutch has been out that long, but have you heard the cooling fan lock up?
If you were going slow and didn't have as much airflow and the right conditions, I could see it getting hot.

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