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Hi..there..Im Rob, A fully certified vehicle technician in the UK and will be assisting you with your question today.
What you mean the small red cover? next the washer fluid filler cap..as thats your positive jump cable point that you use to jump start the car.. thats part of cover which has symbol on it for the brake fluid..you lift that cover and under that is the brake fluid reservior..Is this what your refering too? there is also a white plastic coolant expension tank on that side also next to the engine..
Thats the radiator/coolant expansion tank..
See the little circle symbol on the cap.showing a caution not to open the cap when the engine and coolant is hot..
Any other questions?