How to Replace Radiator 01-05 BMW 325Xi
Difficulty: Advanced · About 150 min · Bmw 325xi
Replace the radiator on a 2001–2005 BMW 325xi and refill and bleed the cooling system with the specified coolant.
Tools you will need
- 10mm Socket
- T20 Socket
- T25 Torx Socket
- Fan Clutch Wrench
- Drain Pan
- Funnel
- Trim Tool Set
Parts and supplies
- Radiator and required seals
- BMW-approved coolant
Steps
Cool the engine and remove the fan assembly
Allow the engine to cool completely, disconnect the negative battery cable, and drain coolant into a pan. Remove the air collector and shroud retainers, unplug the fan, then use the correct reverse-thread tool to remove the fan and shroud together.
Remove the air box and reservoir
Disconnect the airflow sensor, release the intake clamp and air box latches, then remove the filter and mounting bolts. Disconnect the reservoir hoses and sensor, remove its screws, and lift the tank off its mounts.
Disconnect lines and remove the radiator
Unplug the lower hose sensor, release the lower radiator and transmission cooler connections, and remove the reservoir bracket fasteners. Free the hose connector and thermostat from their mounts, then lift the radiator vertically from the vehicle.
Install the replacement radiator
Transfer required brackets and mounts to the new radiator, then lower it into position without damaging the fins. Reinstall the reservoir bracket, connector, thermostat, and cooler lines, ensuring every retaining clip locks fully.
Reconnect hoses and fan assembly
Reconnect the lower and upper radiator hoses, electrical sensor, and reservoir lines. Reinstall the fan and shroud, reconnect their wiring, then restore the air box and intake duct.
Refill and bleed coolant
Fill with the specified coolant and bleed the system using the BMW procedure. Monitor temperature closely, check for leaks, and allow the engine to cool completely before rechecking the level.
Check your vehicle’s repair manual for exact specifications and fit.