Activate radio-ready state:
Some electronic systems/power consumers remain ready for operation.
The radio-ready state switches off automatically:
The radio-ready state remains active if, e.g., the ignition is automatically switched off for the following reasons:
If the engine is switched off and the ignition is switched on, the system automatically switches to the radio-ready state if the lights are turned off or, if correspondingly equipped, the daytime running lights are activated.
BMW X3 Service & Repair Manual > Auxiliary. heater with control elements: Replacing turbocharger coolant pump for auxiliary heating
Special tools required:
13 3 010
WARNING: Risk of burning!
Repair work on the cooling system may only be carried out when it has cooled
down.
Recycling
Coolant emerges when coolant lines are detached. Have a suitable collecting vessel ready.
Catch and dispose of emerging coolant.
...