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You wait until the car is stone cold. You remove the pressure cap that is on top of the radiator. You also unscrew the lower tap on the radiator and allow the coolant to run into a separate container not on the ground or pavement. You also remove the hose that is attached to the cars overflow plastic container. Once all of these have been unscrewed and removed and opened you take a garden hose and run fresh water through the radiator's top opening as well as through the over flow plastic container. Remember to tighten the lower screw and re attach the over flow tube before putting water and fluids back into the system.

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Q: How do you flush the engine coolant on a 1998 Honda civic?
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