My truck keeps overheating. New radiator assembly, thermostat, fan clutch, upper hose, radiator cap. Coolant is full in overflow tank and in radiator. No leaks into oil, or on the ground that I've noticed. No white smoke coming out of my tail pipe. I'm stumped. Any ideas? (might be related) my check engine light is blinking. Talked to a mechanic and he said it's my fuel filter.