How to Replace Radiator Overflow Tank Mounting Plate 01-05 BMW 325Xi
Difficulty: Advanced · About 180 min · Bmw 325xi
Replace the radiator overflow tank mounting plate on a 2001–05 BMW 325Xi, moving the fan, reservoir, radiator hoses, and transmission cooler connection for access.
Tools you will need
- Floor jack
- Jack stands
- 10 mm socket
- T20 socket
- T25 Torx socket
- Fan clutch wrench
- Drain pan
- Trim tool
- Funnel
Parts and supplies
- Coolant reservoir mounting plate
- Specified coolant
Steps
Disconnect battery and remove fan
Disconnect the negative battery cable and remove the air collector. Unplug the fan connectors, release the shroud fasteners, and loosen the reverse-threaded fan clutch with the proper tool.
Remove the air box and reservoir
Unplug the airflow sensor and remove the air box. Drain coolant into a pan, disconnect reservoir hoses and sensor, and lift the coolant reservoir out of its mount.
Disconnect hoses and cooler fitting
Unplug the lower hose sensor and release the radiator and thermostat hoses. Disconnect the transmission cooler fitting and thermostat from the mounting plate, catching remaining fluid.
Remove the mounting plate
Remove the plate fastener and carefully release the old plate from the radiator. Keep seals and connectors clean, and inspect mating surfaces for cracks or debris.
Install the new mounting plate
Seat the replacement plate into its radiator connection and secure it. Reinstall the thermostat and cooler fitting, then reconnect all hoses, clips, and electrical plugs.
Reinstall reservoir, fan, and intake
Return the reservoir and air box to their mounts. Reinstall the fan and shroud, reconnect their wiring, then reconnect the battery.
Refill and bleed coolant
Fill with the specified coolant and bleed air using the vehicle procedure. Run the heater as directed, monitor temperature, and recheck the level after the engine cools.
Check your vehicle’s repair manual for exact specifications and fit.