DIY Car Radiator Flush and Maintenance

The reason why it is so important to maintain a healthy car radiator is because it pumps a cool flow of water throughout the engine. This protects sensitive engine parts from overheating and warping due to friction. Also, keeping a clean flow of circulated water is another point to remember in radiator and cooling system maintenance. Ensuring that the flow of water is free of any debris and contaminants will further safeguard engine parts and hoses.

Otherwise, obstructions and blockages in the engine caused by foreign objects such as leaves, insects, sediment (dirt, rust), etc. can get into the water supply running through the cooling system. The build up can impair the car’s radiator, and cause the engine to overheat. This is why it’s important to have your car on a regular servicing schedule, or for you to be competent in general car maintenance. Here are some helpful tips for performing a minor service and flush on your radiator.

Find an ideal area to perform your radiator flush- preferably an area with a flat, level working surface. Open areas with plenty of space are a great example. Next, vent the engine by turning on the car’s heater, making sure to switch off the ignition to the vehicle. For the next step, you are going to place a protective cloth or covering over the engine block to protect it from any water spilling from the radiator.

Carefully remove the radiator cap, and then tap the radiator by opening up the valve beneath it. As the water empties, proceed to disconnect all of the hoses connected on both the upper and lower areas of the radiator. Be sure to take note of the condition of the hoses as you remove them- if they feel or appear to be soggy or brittle in texture, then replace them with newer hoses. This will prevent any possible water leaks, as well as loss of water pressure.

Also, observe the clarity of the water as it drains from the radiator- if it runs clear, and then your radiator is in good condition. If you notice any brownish or reddish color in the water, this may indicate rust and corrosion, which means that an additional flush needs to be performed on the radiator.

Start with a simple flush by flowing water from a water hose through the opening at the top of the radiator, until it runs clear. Next, do a reverse flush by flowing the water from the bottom of the radiator until it flows out clear from the top. Lastly, do a thorough flush to remove any deposits and debris from the engine-cooling jacket.

If you notice that the condition of the water is extremely mucky, then the best thing to do in this case would be to purchase a can of radiator flush and run it through the cooling system. Don’t forget to reattach all of the hoses before you perform this type of radiator flush. Since you won’t be running water pressure from a water hose, you will need to turn on the vehicle to circulate the fluids. Afterwards, close off your radiator tap and fill the radiator with engine coolant instead of water.

The liquid coolant will help to prevent build up and corrosion in your radiator and engine. Do a final check for leaks and topping off with more coolant by driving around the block. While the engine is still running, check beneath the vehicle for any coolant leaks.