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IF YOU ARE TALKING ABOUT THE COOLANT DRAIN ON THE ENGINE BLOCK YOU REMOVE THE KNOCK SENSOR ON THE LOWER SIDE OF THE ENGINE, IT HAS A WIRE ON IT . IT IS BACK OF THE MOTOR MOUNT. WHEN YOU FILL THE ENGINE BACK UP WITH COOLANT BE SURE TO GET THE AIR OUT (94 ON)THERE IS A SMALL SCREW ON THE TOP OF THE ENGINE JUST BEFORE THE THE TOP HOSE GOES INTO THE BLOCK, JUST LOOSEN IT TILL THE AIR IS ALL OUT.

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