Febi has outlined essential installation and bleeding protocols for electromagnetic water pumps fitted to various BMW models, covering part numbers 47160, 48424, 48425, 48426, 100336, 101104, and 178011.
Workshops must ensure electromagnetic water pumps do not run dry. Units stored for reuse should be filled with coolant to prevent seizure and potential engine overheating. If a pump has been stored empty, the impeller must be turned by hand to verify it has not seized before hoses are connected.
During fitting, electrical connectors must be clean and dry. Installers are required to replace the aluminium fixing bolts, ensuring they are tightened in accordance with the vehicle manufacturer’s specifications.
Refilling the cooling system requires complete air expulsion. After initial venting via system bleed screws and securing the expansion tank cap, technicians must perform the electronic activation sequence without starting the engine:
- Connect a battery support unit to the vehicle battery.
- Switch on the ignition.
- Set the cabin heater to maximum temperature and the fan to its lowest speed.
- Fully depress the accelerator pedal for 10 seconds to trigger the automated 12-minute bleeding cycle.
Once the pump stops automatically, top up the coolant in the expansion tank to 100ml above the maximum mark and check for leaks. If re-bleeding is required, switch off the ignition and remove the key for approximately three minutes before repeating the procedure.
For more technical information please visit partsfinder.bilsteingroup.com or partsfinder.bilsteingroup.com.