Look at the pictures to find out if you re looking at the right bolt.
E46 engine coolant drain plug.
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.
Using either a 1 4 ratchet or a larger pivoting head ratchet slightly loosn the 13mm bolt until you can loosen the rest of it by.
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Place the bucket beneath the drain bolt.
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.
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.
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Look on the exhaust side of the engine block before the front axle.
Leo your bmw s coolant should be blue bmw type sometimes referred to as cool blue common with some merc and volvo spec fluids.
On my 325xi it would take a 18 inch extension with swivel socket.
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.