How To Flush A Radiator (with Pictures) - WikiHow

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1 Fill the radiator with engine coolant or diluted antifreeze. Add engine coolant to the radiator by funneling the liquid into the top of the radiator, where you added the other liquids.[8] X Research source Fill the radiator until the coolant reaches about 1 in (2.5 cm) beneath the lip of the opening, or to the fill line indicated on your radiator.
- Pour slowly since the liquid may back up into the funnel.
- Engine coolant is a 50:50 mix of antifreeze and distilled water. If you only have antifreeze, mix 1⁄2 US gal (1.9 L) of antifreeze with 1⁄2 US gal (1.9 L) of distilled water, then add it to your engine in the same manner as coolant.
2 Run your vehicle for 15 minutes to pull the coolant into your cooling system. Your car holds more coolant than what fits in the radiator, and the coolant also needs to disperse through the pipes and internals of your car. Turn the ignition and let the car run for 15 minutes to allow the coolant to be taken all the way through the cooling system.[9]
3 Add more coolant to fill the reservoir. Turn off the engine and let your car cool for 15 minutes before removing the pressure cap again. Check to see if the coolant is level with the fill line inside the radiator. If not, add more of the solution.[10] X Research source
- Pour any leftover coolant into the transparent overflow reservoir, or save it until the next time you need to flush your system.
4 Flush your radiator every 30,000 miles. This keeps your radiator clean and free of blockage or debris. Also, give your radiator a flush any time you notice your car repeatedly overheating, see white or blue smoke coming from under the hood, notice a coolant leak (fluids on the ground under your car’s nose), or notice a knocking noise in your engine.[11] X Research source These problems are often related to your radiator.
- If your problem persists after flushing your radiator, consult a mechanic to diagnose the issue.