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Thanks greasytshirt, it seems like the coolant is not returning to the overflow tank properly, I will replace the radiator cap and the return lines for the overflow tank

Hi, I have a 2006 Hino 268 and my coolant warning light keeps on coming on. When the engine is cold it stays on and when it warms up the light keeps on going on and off, especially if I'm entering a curve on the freeway. I have checked the coolant leave and it is topped off. Any suggestions...