On my 325xi it would take a 18 inch extension with swivel socket.
E46 engine coolant drain plug.
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Look at the pictures to find out if you re looking at the right bolt.
Then wait for all the water to drain out it may take about 10 minutes.
Usually stripped out after being removed brand.
Does anyone drain coolant from system thru engine drain plug.
Coolant left in the bottom of the overflow tank is normal if you do not remove the engine drain plug s well as the radiator drain plug.
Leo your bmw s coolant should be blue bmw type sometimes referred to as cool blue common with some merc and volvo spec fluids.
Engine cooling covers drive belts electrical emissions filter fuel gaskets seals ignition intake mechanical mount oil service performance pulleys software supercharger timing tools turbocharger vacuum system.
Make sure the radiator isn t too hot then slowly open the radiator cap again with your face pointing in the other direction open and remove the big bottom blue drain plug again loosen the smaller blue drain plug and then loosen the top bleed vent screw again.
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I am aware that the radiator has a drain plug but that seems like it would only drain a portion of the system.
Find the engine block drain plug.
Look on the exhaust side of the engine block before the front axle.