Is the temperature needle heading for the red? Typical, just when you could do without it, you’re stuck in traffic and your engine is overheating! You might not have paid much attention to it, but the temperature gauge has probably been showing a higher temperature than normal for a while now, getting progressively worse, but what is the problem?

Common causes of overheating

  • a faulty thermostat
  • a clogged cooling system
  • poor airflow to the radiator
  • the cooling fan has stopped working, due to
    • a malfunctioning thermostatic fan switch
    • broken fan blades
    • a malfunctioning viscous fan coupling
    • a broken or slipping drive belt
  • incorrect antifreeze mixture
  • etc., …

Is there a simple and cost-effective way to cure the problem?


If you can eliminate the obvious causes, e.g., a slipping drive belt, coolant mixture, broken fan etc. and suspect the radiator is blocked, then cleaning the cooling system with BIZOL Radiator Clean r70 could well be the answer.


Over time cooling systems can become less efficient as the coolant pump, radiator channels and waterways can get slowly choked by the formation of deposits. Corrosion, sludge, scale and other deposits form, unseen, inside the radiator, heater matrix and engine block, significantly lowering cooling system efficiency. BIZOL Radiator Clean r70 is a cost-effective way of eradicating unwanted contaminants and can restore cooling system efficiency.


Treatment with Radiator Clean r70 is a certainly less expensive and time-consuming method than removing, inspecting and replacing expensive parts.


How does BIZOL Radiator Clean r70 work?


BIZOL Radiator Clean r70 is intended to reset the cooling system, restoring cooling performance, preventing overheating in summer and freezing in winter. The special formula removes scale and rust particles, then neutralises and flushes out the harmful deposits to give you a rust, sludge and scale-free result.

How do I restore my cooling system’s performance?

Open the bonnet, remove the pressure cap and pour in a tin of BIZOL Radiator Clean r70 and refit the pressure cap.


Start the engine and let it idle for 15 minutes to get the thermostat open and so that the additive circulates fully around the system. BIZOL Radiator Clean r70 can now get to work, cleaning the channels in the radiator, the coolant pump and waterways in the engine block.


When the coolant has had sufficient time to circulate, switch off the engine and allow the cooling system to cool down before performing any work on the system. The next step is to drain the cooling system. Disconnect the bottom radiator hose or loosen the radiator drain plug and drain the system. As an extra precaution to ensure that all of the sludge and deposits are removed from the system, you could flush the radiator with fresh water before reconnecting the bottom hose.


Now, with the corrosion, sludge and scale thoroughly flushed out of the system, reattach the bottom radiator hose. All that’s left to do now is refill the cooling system in accordance with the manufacturer’s instructions and bleed the system. Well done, that’s it, you’ve earned yourself a coffee.

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