Cooling problem - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 5 (permalink) Old 03-25-2011, 07:46 AM Thread Starter
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Cooling problem

Hello . I have a 03 G.M.C . 2500HD with the Duramax . When Im running down the road at a normal speed the temp runs about 190 . When I start climbing a hill with it it will go up to 210 . It never overheats and very quickly cools back down after leveling out . I've changed Thermostats but it still happens . Not sure where to start . Any help would be great . Thank you .
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post #2 of 5 (permalink) Old 03-25-2011, 07:51 AM
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nymax - 190F to 210F is the normal operating range... keep on truck'n!

Previous 2003 GMC 2500HD CCSB
Current 07.5 2500HD LTZ NBS 6.0 Gasser CCLB BDS 7" Lift 20" KMC XD Rockstars, 37" Nitto Grapplers
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post #3 of 5 (permalink) Old 03-25-2011, 07:56 AM
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yup thats normal.. plus your temp gauge is more than likely off by like 5-10 degrees anyway.

2005 Silverado 2500HD Ext. Cab Long Bed

Mostly Stock
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post #4 of 5 (permalink) Old 03-25-2011, 08:13 AM Thread Starter
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I've owned the truck for 3 years now and it never wavered this quickly before . Even towing my loaded trailer . Its jumping fast . Im headed to Florida to pick up a 38 oldsmobile and am worried about overheating . It doesnt overheat It just heats up fast then drops quickly .
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post #5 of 5 (permalink) Old 03-25-2011, 08:14 AM
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Normal, but you want to make sure the "Stack" is clean-- AC condenser, inner cooler, and radiator. It may be full if dirt, leaves and bugs. And hot weather is coming.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.
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