Best Homemade Radiator Flush

Car radiators are meant to keep a car’s engine running at a safe temperature. The radiator’s antifreeze keeps the engine cool while also acting as a filter for certain pollutants in the engine block. The antifreeze in your car should be replaced every 50,000 miles. At this point, you should also clean the radiator. The radiator may be cleaned without the use of any special products. A quick and easy DIY remedy would suffice.

Identify whether or not your radiator needs cleaning.

Determine whether your radiator genuinely needs to be cleaned before you start making your radiator cleaner. The only time a radiator has to be cleaned is if your mechanic suggests it.

While flushing was once essential since radiators were constructed of steel and other readily corroded metals, most current automotive radiators are made of aluminum, which eliminates the need for flushing. In general, new automobile radiators receive the greatest cleaning when they are drained and refilled every 50,000 miles. If your technician advises a radiator cleaning, you can do it yourself with confidence.

Best Homemade Radiator Flush


To clean your radiator successfully, you don’t need any sophisticated cleaning chemicals. In reality, some materials have the potential to harm the radiator system. All you actually need is distilled water to generate an excellent cleaning solution.

Because tap water includes mineral residues that might interact with the antifreeze and cause difficulties in the radiator, it is not recommended for this project. Most supermarket stores and home supply businesses sell distilled water. Make sure you don’t buy mineral water by accident. The only cleaning component you’ll need to cleanse the radiator system is distilled water.

More: How often Coolant Flush

1st Method:

How to Use Distilled water to Clean Your Radiator


The engine must be completely cool before you touch anything around the radiator area. If you do not let the car completely cool, you could get serious burns on your hands and face. The best time to perform the cleaning is in the morning before you use the car.

  1. Place a pan under the radiator to catch the old antifreeze.
  2. Open the cap to the radiator, and unscrew the drain plug on the bottom of the radiator.
  3. When the antifreeze is drained, close the drain plug and pour the distilled water inside the tank.
  4. Close the cap, and run the engine until the temperature gauge inside the car reads safe levels.
  5. Turn off the car, and allow the engine to cool.
  6. A few hours later you can refill the radiator with additional antifreeze.

2nd Method:

How to Use Vinegar to Clean Your Radiator

Flushing the radiator with vinegar is an excellent technique to remove all of the dirt and residue that has collected over time. I would not propose flushing the whole system with vinegar, contrary to several guidelines. We’ll get to it later; right now, we’re going to go over the processes for cleansing the radiator.

  1. Raise the vehicle with a jack, then place jack stands to secure it in place as you’ll have to get underneath the vehicle.
  2. Place an oil pan or a bucket underneath the radiator and open the drain plug located at the lowest point of the radiator.
  3. Disconnect the upper and lower radiator hose.
  4. Plug up the hose connection points to seal the radiator.
  5. You can choose to pour either 50% distilled water and 50% white vinegar mixed up, or pure white vinegar.
  6. Let it soak overnight or longer if you have time. One to two days should be enough.
  7. Release the liquid, then rinse the radiator with distilled water. If it’s still dirty, plug it up, add vinegar and let it soak one more time.
  8. Rinse all the vinegar out of the system. Once the distilled water becomes clear, you can re-use it a few times to make sure the rinse is good. Finish up with a batch of pure water.
  9. Reconnect the hoses and refill the coolant.

3rd Method:

How to clean a radiator with baking soda

Here is a separate article are in detail. Readout:

About The Author

Avatar for Ibrar Ayyub

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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