Negative rep for Mazda for not providing a reasonable place for flush/fill kit to make this easy and effective by just hooking the water hose up while car is running with heater on until clear comes out the radiator on the gorund. Then all you'd have to do is drain radiator, fill with gallon of coolant and top off with water and call it good but nooooooooooooo, only place to get to heater hose to put one on is underneath the car. So, as was stated, drain, fill with water, run car and repeat a few times until most old coolant is out. Time wasting s***, especially when drain on radiator is a b**** to open and close.