Mr . brian belloso is right , on everhthing he sayd , but also, check from where the leak is coming out , you maiby has a loose hose ,,, ,, my friend....
They have a couple different additives you can use to help slower and/or even stop the leak. But I'd recommend you find where the leak is at and fix it as soon as possible to prevent any overheating or severe damage to your motor.
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