# Expansion tank remove and install

Remove cap from expansion tank |
Drain radiator. If radiator is not equipped with a drain plug, remove lower hose. Catch coolant in a suitable clean container, re-use or dispose of at an approved recycling center. |
Remove wiring connector from level sender and unscrew 30mm retaining nut. (green arrow) Remove overflow hose (blue arrow) and bypass hose (red arrow) Remove the two mounting nuts (yellow arrows) |
Lift up expansion tank and remove feed hose. |

### Installation

Take care not to exert pressure on nipple for overflow hose, it is easily broken.

### Torques

Mounting bolts for expansion tank : 9 Nm ( 6.5 ft lbs.)
Level sensor 3.5 Nm (2.5 ft lbs. )
Radiator drain plug : 3 Nm ( 2 ft lbs.)

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson