What is a Radiator Flush?

A Radiator Flush also known as a Coolant Flush is a concoction of chemicals used for cleaning a typical car radiator. A Radiator Flush is specifically formulated to removed rust and scale also purging the old contaminated coolant from the cooling system. Think of it as a blood transfusion for your car’s cooling system.

A Radiator Flush service involves running several litres of water and new coolant through the cooling system to get rid of all the old coolant along with the contaminants that may have built up over time.

Why should you choose GoMechanic Radiator Flush?


GoMechanic Radiator Flush is a cleansing concentrate for car radiators brought to you by GoMechanic. It is compatible with all the conventional coolants and antifreeze concentrates while also removing tough sludges from thermostat valves, pipes and control mechanisms and also dissolves oil-soluble, oil-insoluble and lime deposits. It has a special alkali and acid-free formula for gentle and corrosion-free cleaning.

Click here to purchase GoMechanic Radiator Flush for your car

5 Signs you need to Flush your Car Radiator

  1. Engine Overheating

    Reason why your car is overheating
    Car Overheating

    The first and foremost sign that’ll tell you to flush your car radiator is engine overheating. If you notice that your engine is often overheating but the coolant level is intact, this is a clear indication that your car is running on a contaminated coolant which is causing the engine to severely overheat. GoMechanic highly recommends that you get your car radiator flushed to avoid engine seizing.

  2. Coolant Leakage

    prevent car from overheating
    Coolant Leakage

    If you notice coolant leakage from your car, this can also be a sign that your car is in a dire need of a radiator flush. Contamination and debris in the cooling system can cause it to run under high pressure which in turn can compromise a coolant hose or an inlet/outlet.

  3. Visible Contamination

    Coolant Contamination
    Coolant Contamination

    Coolant contamination is a common sight in today’s vehicles. Often time car owners forget to flush out the old coolant and just keep topping up the coolant reservoir again and again. This leaves room for scaling and rust build-up which in turn contaminates the coolant over time. Check your coolant reservoir for coolant colour which should be either green or red. If your coolant is murky brown in colour, it’s time for a Radiator Flush.

  4. Engine Knocking

    Engine Oil Check - Basic Car DIYs
    Engine Oil Check

    Believe it or not, a knocking engine can also be a sign that your car needs a Radiator Flush.

    It is simple, the coolant is responsible to cool the engine to increase its efficiency. The coolant is drawn in through the water pump around the cylinder which pulls the heat and cools the engine. If the coolant is contaminated, the water pump will struggle to run the coolant around the engine which will cause the engine to overheat and eventually knock.

  5. Sweet Odour from the engine bay

    Car Heater
    Green Coolant

    If you smell a sweet odour coming from inside the engine bay, trust us, it’s not your brand new car perfume. It is leaking coolant inside the engine. Coolant, when it burns smells sweet like maple syrup. If you are getting a faint sweet smell from your engine bay, it’s time for a Radiator Flush.

8 Benefits of using GoMechanic Radiator Flush

  1. Removes Rust & Scaling

    Radiator Cap Rusting
    Radiator Cap Rusting

    What a radiator flush does is purges the old anti-freeze, which helps to remove the rust and scale deposits that build up over time in your cooling system. Removing rust and scales is very important since it can cause engine overheating, damage to your radiator or even engine seizing.

  2. Increases Heat Transfer & Promotes Cooling

    GoMechanic Smartcool Coolant
    GoMechanic Smartcool Coolant

    Routinely flushing your car cooling system helps your engine cool better. Replacing the old coolant with a fresh pour cleans the cooling system of any debris while also restoring its heat transferring ability.

  3. Purges the Cooling System of Contamination

    Oil In Coolant
    Oil In Coolant

    The special additives and formulants in a coolant lose their anti-corrosive and rust-inhibiting properties over time which causes the rusting and scaling, which in turn contaminates and reduces the coolant into murky brown water. Routine radiator flushing prevents purges of the old coolant along with any contamination.

  4. Prevents Coolant Foaming

    Coolant Foaming
    Coolant Foaming

    Coolant Foaming is real and happens when the coolant is contaminated. A fresh pour of coolant is usually not helpful in getting rid of coolant foam. However, using Radiator Flush can greatly help in removing and eliminating coolant foaming.

  5. Good Preventive Maintenance

    Radiator Flushing is just good preventive maintenance. The process involved in Radiator Flushing includes a complete inspection of the cooling system including the water pump, radiator, pressure testing to check for leaks. All-in-all a complete 360° cooling system check.

  6. Enhances Water Pump Bearing Life

    Water Pump
    Water Pump

    Skipping on Radiator Flushing is a common mistake that could lead to a failing water pump. The old coolant is likely to be contaminated which can cause debris to settle down on the pump seal. As a result, this debris can scratch and damage the sealing surface, which could lead to premature pump failure. It is very important to periodically flush the cooling system to enhance water pump bearing life.

  7. Lubricates The Water Pump

    The additives in a coolant help lubricate the water pump which is a crucial part of your car’s cooling system. Routinely flushing the cooling system will increase the water pump’s lifespan in the longer run.

  8. Prevents Rust Build-Up in the Water Pump

    Very similar to the 6th point, when you flush the radiator, you also clean out the cooling system including the water pump (including its components). This flushing removes any rust deposits and inhibits future rust build-up thereby ensuring a healthy functioning water pump.

How often should you use Radiator Flush?

GoMechanic recommends flushing your car radiator annually or every 50,000 kms, whichever comes earlier. However, if you have a new car with less than 10,000kms on the odometer, there is no need to flush the cooling system for at least a year.

It is also very important to keep a check for heating issues or observe the coolant isn’t visible contaminated. If so, rush to your nearest GoMechanic workshop for a free inspection.

What will happen if you skip Radiator Flushing?

So, the question arises; what will happen, if I skip Radiator Flushing? If you are experiencing issues with your car, such as a leak, overheating or a sweet odour coming from the engine bay, then not flushing the cooling system will mean that you will make the problem worse and will probably cause critical irreversible damage to the radiator, cooling system and even the engine, which will definitely burn a hole in your pocket sometime in the future.

You can also expect rust, corrosion, foreign contamination to build up in your coolant system. Eventually, this will damage gaskets and seals which will cause leakage, rapid overheating and a host of other problems that you and your car are better off. It’s much better to get your car radiator completely flushed now than after it has started damaging your car.

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