[535_BiTurbo]

Car is a 2012 550i

What are the symptoms of a charge/intercooler aux coolant pump failure?
Will the intercoolers be hot?

[Sunnyc123abc]

There will be a message on the idrive. Forgot what it says but something along the lines of engine is hot drive moderate. It will come on every time you start your car, even when it is cold.

For me I also could hear the pump making loud noises when the car was off after driving.

[535_BiTurbo]

Car has 3 coolant pumps;
Main Engine
Turbos
Charge Coolers

The turbo pump runs after the car is shutdown and the other 2 runs while the engine is running

[Sunnyc123abc]

my bad i thought you were talking about the turbo aux pump.

When i did the coolant bleed procedure, I could open the intercooler coolant tank and see the coolant was flowing. Maybe try that

[535_BiTurbo]

Originally Posted by Sunnyc123abc

my bad i thought you were talking about the turbo aux pump.

When i did the coolant bleed procedure, I could open the intercooler coolant tank and see the coolant was flowing. Maybe try that

Hmmmm🤔. My intercooler coolant wasnt flowing in the tank, but the car is not overheating. I just get a 20A504 code.
When I did the bleed procedure, the turbo coolant pump remained silent and I only heard the charge cooler/intercooler pump come on but no coolant was flowing through the intercooler reservoir.