Yeah definitely flush the radiator if it has alot of rust in it. Might need to flush it out a couple of times.

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2003 mazda b3000 2wd dual sport/ V6 3.0 liter/ manual 5-speed transmission/ 4.10 gears/ sony Xplod head unit/ red led's on floorboard/ T-bar crank/ flipped blocks/ tinted windows.