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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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Bionic_Man's avatar
Bionic_Man
Explorer
Feb 06, 2020
I'd suggest you be a little more specific about "overheat". Did the engine temp or transmission temp lights go on?

What did the temps read? I've seen my truck get to 230* in both transmission and engine temp on a hot (relatively) day running that route. Also makes a difference if you are able to run straight up, or if you are slowed down by traffic.

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