Over heating when pulling a load - Diesel Bombers

Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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Old 06-11-2013, 10:30 PM
Thread Starter
Join Date: Nov 2012
Location: Wyoming
Posts: 6
Default Over heating when pulling a load

I bought a 2003 chevy duramax a couple months ago hauled a couple of cars with no problem I have now installed a edge attitude with juice programmer and a cold air intake and was hauling a car and it started to over heat I was running around 70 so I slowed down and the temp droped On the way home I had 2 toyota trucks on the trailor and it over heated agian so I unloaded one and it dropped but still stayed hot .Once the truck wasnt pulling anything it runs cool any help would be great. The truck has 164000 miles and is a duelly with cat deplete
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Old 06-12-2013, 10:12 AM
MillerBoyzDiesel's Avatar
Diesel Wrench
Join Date: Dec 2011
Location: Kentucky
Posts: 763

Is your fan clutch working alright? a/c condenser, intercooler, radiator fins clean? Coolant level correct. What setting are you running the programmer on?
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Old 06-12-2013, 08:30 PM
Thread Starter
Join Date: Nov 2012
Location: Wyoming
Posts: 6

I was running in the tow mode on my edge and had the tranny in tow also The first two cars I hauled I didnt have the edge could it be over fueling my truck? I will check the raidator and clutch fan but if something was wrong with them wouldnt it overheat all the time?
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Old 06-28-2013, 03:17 AM
Diesel Bomber
Join Date: Dec 2010
Location: Fool's Golden State
Posts: 1,187

not necessarily.

i have been running for the better part of a year with out any fan at all and it doesn't over heat (except once). granted it will run a little on the hot side when driving below 30 mph for extended time. i dont tow much so i have been able to get away with it like this

towing puts a much greater demand on the cooling system. when you add a programmer and increase the fuel the cooling system now has to dissipate the extra heat generated and can overheat easier.

i would, as suggested above, check the cooling system and maybe even a coolant flush and replace the thermostats.
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