Fluid reservoir for Power steering, brake circuit, windscreen wiper, engine oil, but I can't find the symbol for the Coolant In this picutre, the power steering reservoir with an orange cap, while windscreen wiper fluid a blue cap on top left. You can see the orange coloured sticker on the brake fluid reservoir. Coolant reservoir with a hot steam warning, it says you must not open the cap when the engine is hot. The battery.