Bigjohn4300 Posted October 28, 2021 Share Posted October 28, 2021 2004 granite 300 AI/Allison combo having overheating a issue. When tagging the excavator (82k gross), water temp climbs to the edge of the red when accelerating from a dead stop to 45, but starts falling fairly soon once throttle backs down (maintaining 40-45). At lower weights, never gets close to red. Radiator rodded out a year or so ago, 50/50 antifreeze changeout yearly, fan clutch appears to be pulling good, Allison verified no trans issues(trans temp stays mid range)...what else should i be looking at? Possibly the cooling package is marginal(seems like i read something on BMT about the 300 hp motors having a “economy” cooling system available for non A/C trucks with a smaller water pump???) This truck was a non-A/C mixer truck up north originally, maybe a marginal radiator with A/C and our ambient temps? any ideas? Quote Link to comment Share on other sites More sharing options...
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