

Let it cool down and redrain the engine for a final time. Run the engine again, this time for around 15 minutes. Follow step 1 to drain the system again, close the valve and fill up with clean water. Turn the car off and let the engine cool down. Fill the system up with clean water, replace the cap and run the engine for as long as the flush product suggests. Use a cooling system flush (available from places like Halfords) to make sure that the inside of the system is clean and grease free before you refill with the new coolant. You should then flush out the radiator to clean the engine out.It's a hazardous material so make sure you follow the laws for your area and don't just go pouring it into your nearest drain. Open the radiator drain valve and drain out the used coolant into a container or bucket that's big enough to hold it all.You can do this yourself but you should only attempt this if you are confident enough to do so as it is quite a complicated procedure. If you see something else in the coolant reservoir, such as oil, then you may have an engine defect somewhere that will need checking out by a professional.If it appears to be brown or a reddy-brown rusty colour, your vehicle may need a radiator flush. The coolant should be clean and free of debris.

They tend to be brightly coloured fluids green, red, yellow, blue - and usually thin and transparent. If there is enough coolant in the reservoir, have a look at the colour.
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Your owner's manual will give you more guidance in this area in regards to the type of coolant to use and at what concentration – there are many different types so make sure you are using the right one for your vehicle. If there is no coolant in the reservoir you may have to pour some directly into the radiator.

There will usually be some kind of indicator on the cap that this is part of the cooling system.
