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I have a 2004 Peugeot 206, I need to top up the coolant, do I need to add antifreeze or can I just use water? How do I find out what type of anti freeze. Also any idea why the coolant tank is red
 

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Water alone acts as an efficient coolant, but water causes corrosion and over time may damage parts of the engine. Also, it's prone to freezing in winter and damaging the car. So, using coolant/antifreeze with water is better, as it acts as a corrosion inhibitor and lowers the freezing temperature.

Most cars require OAT antifreeze/coolant, although it's best referring to the handbook to make sure. IAT is another type. DON'T mix OAT and IAT.

The colour of the fluid isn't important - it's just a dye to indicate coolant concentration.

The tank may be red from staining from the dyes used, it through aging of the plastic.

Coolant Explained
 
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