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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...
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Travel_glampers's avatar
Travel_glampers
Explorer
Feb 07, 2020
Thanks for the info you all,

I'll be heading back to CO in June (San Juan Mts.).

Do you know what changes GM made?

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