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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
Roger10378's avatar
Roger10378
Explorer II
Feb 07, 2020
Most of the overheating problems were solved by 2009. Have you checked the stack for debris? This is one of the things that often affect the temp on an older truck.

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