Your Prestone Cooling System Flush FAQs Answered

Do you need to flush your car’s cooling system and replace the old coolant/antifreeze? Instead of using water, Prestone Cooling System Flush provides a powerful way to clear out your car’s cooling system ready for a fresh batch of coolant.

Learn more about how and when to use Prestone Cooling System Flush in our FAQs guide below.

What is Cooling System Flush?

Prestone Cooling System Flush is a specialist cleaning product designed to remove dirt, contaminants, and deposits from your car’s cooling system. This deep clean eliminates dirt and limescale, reducing corrosion and improving the lifespan of internal components.

If you’ve done a cooling system flush before, you might have used water to remove old coolant/antifreeze. But water doesn’t clear away deposits and scale; in fact, it can contribute to the problem.

Seeking a solution, the experts at Prestone developed Cooling System Flush – a powerful cleaner that removes dirt, deposits, and contaminants from the cooling system when flushing the radiator. Safe for all engines and all cooling system components, Cooling System Flush is an effective way to maintain the materials within the cooling system, including metals, plastics, gaskets, and hoses.

How often do I need to use Prestone Cooling System Flush?

We recommend using Prestone Cooling System Flush each time you flush the radiator. Ideally, this should be done in line with the vehicle’s service schedule.

Remember, Prestone Cooling System Flush should be used as an alternative to water whenever you flush the system to remove the old coolant/antifreeze. Unlike water, the product won’t contribute to limescale and corrosion, instead removing deposits and contaminants which can accelerate decay in the system.

If you flush with Prestone and then refill the system with Prestone Coolant/Antifreeze, it’s guaranteed for 10 years and will protect your car for 300,000 miles, saving you time and money.

How does Prestone Cooling System Flush work?

Prestone Cooling System Flush contains powerful cleaning and anti-limescale agents that remove grime, deposits, and contaminants from the cooling system. It circulates through the cooling system after old coolant/antifreeze has been drained, lifting deposits, and helping to protect components such as gaskets and hoses.

Cooling System Flush is designed to be used in place of water when flushing the cooling system. So, you drain the coolant/antifreeze, add Cooling System Flush, and run the engine for a few minutes to allow the product to circulate through the system, cleaning as it goes.

After that, it’s just a matter of draining the product from the system and topping up with fresh Prestone Coolant/Antifreeze, which will protect the engine from extreme temperatures for up to 10 years, or 300,000 miles.

How do I replace Prestone Cooling System Flush?

You don’t technically ‘replace’ Prestone Cooling System Flush. It’s a single-use cleaner that helps remove contaminants and limescale from the cooling system when flushing the radiator.

Here’s how to use it:

  1. Drain the old coolant/antifreeze from the cooling system. If you’re not sure how, read our comprehensive guide on how to do a coolant flush.
  2. Replace the radiator drain valve and add Cooling System Flush to the coolant reservoir. Don’t replace the cap.
  3. Start the car and let the engine run for 5-10 minutes. This will circulate the product through the system, where it will lift contaminants and limescale.
  4. Switch off the engine and allow it to cool. Then, repeat the steps you took to drain the soiled cleaning solution from the system.
  5. From there, it’s a case of topping up your car with high-performance coolant/antifreeze.

For more information on Prestone Cooling System Flush and other products in our high-performance car maintenance range, head to our full product page.