Disconnect the return line to the reservoir,put the return hose in to a gallon container (add a longer hose and fitting if needed) jack up the car so the front wheels are of the ground. turn the steering from side to side while adding fluid, get a friend to start the engine and slowly turn the steering from side to side while you keep adding fluid, keep doing this until the fluid coming out is clean. Reattach hose drive and recheck fluid level.
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