[Hxm99]

Hello guys
I just attempted a coolant drain on my N53( was a PITA). anyways I managed to drain the radiator via the drain plug and the water pump via those BMW metal clip style hoses. Upon measuring the water loss, I realised I had only drained about 5 litres of coolant, meaning there's about 4-5 litres of coolant still in the system. It would be super helpful if someone could guide me on how to drain rest of the coolant, do I have to loosen one of the screw type clamps or is there a BMW metal ''lock'' type hose somewhere in there that needs disconnecting. There is a pipe that goes into the engine block, just under the oil filter housing, if this pipe is removed would it drain rest of the coolant?

does the thermostat hold water as well?

[aphael]

all the hoses say in the heater core wont be able to drain its coolant, you usually run it with bleed with distilled water or coolant to get the rest out, sometimes can take multiple times. the thermostat also does hold in water

[Hxm99]

Originally Posted by aphael

all the hoses say in the heater core wont be able to drain its coolant, you usually run it with bleed with distilled water or coolant to get the rest out, sometimes can take multiple times. the thermostat also does hold in water

Can Bleeding the system 5 times in total, cause damage to the pump?
A lot of crap came out of after I flushed the cooling system twice with tap water. Thinking of flushing it once again with distilled water to get the tap water out. Then bleed it twice after finally adding the coolant.


So that 5 bleeds in total

[aphael]

Originally Posted by Hxm99

Can Bleeding the system 5 times in total, cause damage to the pump?
A lot of crap came out of after I flushed the cooling system twice with tap water. Thinking of flushing it once again with distilled water to get the tap water out. Then bleed it twice after finally adding the coolant.


So that 5 bleeds in total

generally i use only distilled, but yeah 5 flushes is more than enough