engine overcooling

[kimumu]

Interesting. Usually a bad bleed will cause higher temps. The S54 bleeds relatively easily but you still need to turn on the heater to open the heater core loop to get all of the air out. Otherwise it is as easy as pour in coolant and go. The M54 is a different story.

Yeah, I thought so. Heater was on. I observed the bubbles from the return line. I will try one more time because I want to make sure if it happens everytime.

[TexaZ3]

I believe coolant temp needle will stay around the middle when temp is in between something like 94 and 108 degrees. So it is not entirely a precise gauge.
If you want actual temp - get values from Inpa or similar.

[sapote]

It kicked in at the coolant outlet temperature reached 55 degrees.

With outlet T at 55C, what is the engine coolant T?
E46 non-M fan turned on at outlet at 80C or higher, but I am not sure for M cars.

The higher T is not related to your new way of bleeding. It's higher bc the fan was unplugged.

[sapote]

I believe coolant temp needle will stay around the middle when temp is in between something like 94 and 108 degrees. So it is not entirely a precise gauge.
If you want actual temp - get values from Inpa or similar.

94 to 108C is too high for the M gauge to stay at 12 o'clock.

[TexaZ3]

94 to 108C is too high for the M gauge to stay at 12 o'clock.

Sure, I don't remember exact numbers. All I'm saying is that the gauge is not absolute - when the needle is in the middle - it could be any temp in the range. OP shouldn't overthink this.

[BMWfanz]

Here is basic Fan power vs outside housing temperature map table.

[sapote]

Here is basic Fan power vs outside housing temperature map table.

The table shows the fan motor input voltage PWM duty cycle from 0% to 100% based on some kind of temperature. I think it should be based on the radiator outlet T primarily, not some sort of outside housing T. Btw, what is exactly Outside Housing T?

From Tis: the fan motor only run between 10% to 90% PWM signal, so this is in conflict with the above table that shows 100% fan voltage at T = 90C.

E46:

The electric fan is activated by means of a power output stage directly on the fan motor. The motor control unit activates this power output stage by means of a square-wave signal with duty factors (variable pulse width) between 10 and 90 % thus controlling the various speeds of the electric fan. Pulse duty factors less than 5 % and greater than 95 % do not trigger activation but rather they are used for fault detection purposes.

[kimumu]

So is there a difference for aux fan operation between m3s and non M e46s? I remember they don't share the same aux fan.

[BMWfanz]

The table shows the fan motor input voltage PWM duty cycle from 0% to 100% based on some kind of temperature. I think it should be based on the radiator outlet T primarily, not some sort of outside housing T. Btw, what is exactly Outside Housing T?

From Tis: the fan motor only run between 10% to 90% PWM signal, so this is in conflict with the above table that shows 100% fan voltage at T = 90C.

E46:

The electric fan is activated by means of a power output stage directly on the fan motor. The motor control unit activates this power output stage by means of a square-wave signal with duty factors (variable pulse width) between 10 and 90 % thus controlling the various speeds of the electric fan. Pulse duty factors less than 5 % and greater than 95 % do not trigger activation but rather they are used for fault detection purposes.

If i will find some free time i will check how it works on my swapped E30 S54, i have only e-fan.

[0-60motorsports]

I wish I had your problems OP lol