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Expansion tank remove and install

Remove cap from expansion tank 170020.jpg (15030 bytes)
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.

170002.jpg (58756 bytes)
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)

170021.jpg (16798 bytes)
Lift up expansion tank and remove feed hose. 170022.jpg (14517 bytes)

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.)

 

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