How to fix coolant leak issue in BMW E46 318i (N42B18)?
Posted: Tue Oct 01, 2024 11:41 am
How to fix coolant leak issue in BMW E46 318i (N42B18)?
Common leak sources:
Common leak sources:
- Expansion tank
- Radiator
- Water pump
- Thermostat housing
- Hoses and connections
- Visual inspection of all coolant components
- Pressure test the cooling system
- Use UV dye to locate small leaks
- Expansion tank replacement:
- Drain coolant
- Remove hoses and electrical connections
- Replace tank (BMW part number: 17117573781) - Radiator replacement:
- Remove fan shroud and electric fan
- Disconnect hoses and remove radiator
- Install new radiator and refill system - Water pump replacement:
- Remove serpentine belt
- Remove water pump bolts and replace pump