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if you think you have a leak, just top up the reservoir with water and find/fix the leak, then flush and change all the coolant fluid,
 

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if the coolant level keeps falling, you have a leak, 'Find/Fix It Now ' it will only get worse and then you will damage the engine, the most common cause of this is the water pump leaking But you do not always see the leak because the coolant leak evaperates with the hot engine, then as the engine cools down the pressure in the cooling system drops and the leak stops (no pressure forcing coolant out), so you never see the leak when the engine is cold but as each day passes the leak gets worse untill something bad happens, so fix it as soon as possible,
BUT it could be something else, the water pump is the common starting point, unless you had overheating issues then that could be very different
 
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