Vortex 6.0 water pump

Messages
41
Location
Northern Michigan
Thread starter
I'm working on a high mileage Chevy 2500hd with the 6.0 gas engine. It seems to overheat when it's worked more than just cruising around empty. I was plowing snow a couple weeks ago and it was getting hot in a short time and I was not plowing any different than I ever have. Today I was pulling a trailer with a tractor on it down the highway and it was getting hot and it's pulled this load many times without trouble. This truck has had a new radiator and thermostat in the past couple of years. The fins don't seem blocked. I have also changed the fan clutch before. My question is can water pumps wear out without having a leaking? Can the impeller wear out? This truck has 460,000+ miles in it and it's still the original water pump.
 
Messages
4,728
Location
Fort Worth, Texas
Cavitation could have done a number on that pump considering the mileage! You can pull the pump & pop the back cover off it to verify. Early LSx pumps had a bolt-on cover that made visual inspection easier & you could reinstall the pump if found good, Unfortunately that's not an option with the pressed in cover. If you have a infrared thermometer.....Check for cold spots in the radiator core as your symptoms could point to a partially clogged radiator OR poor water flow! Was the thermostat OE? I haven't had good luck with aftermarket ones!
 
Messages
305
Location
Rainville, USA
It certainly sounds plausible assuming the fan clutch is operating per spec. Is it weeping at all? Either way, impressive mileage, starting to see a lot of older (2000-2005/6-ish) GMTs with the LS based engines popping up with TONS of miles on them, guess they really built them right back in the day
 
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Messages
2,629
Location
San Rafael, CA
Originally Posted by JEL01
It certainly sounds plausible assuming the fan clutch is operating per spec. Is it weeping at all? Either way, impressive mileage, starting to see a lot of older (2000-2005/6-ish) GMTs with the LS based engines popping up with TONS of miles on them, guess they really built them right back in the day
Yup 290k on mine. I think they are as good or better than the classic small blocks.
 
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