17 22 010 Removing and installing/replacing heat exchanger for automatic transmission (N54)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Danger of scalding!
Only perform this work after engine has cooled down.

Necessary preliminary tasks:

Drain coolant
Remove underbody protection . See 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION (CONVERTIBLE) or 51 47 490 REMOVING AND INSTALLING / REPLACING FRONT UNDERBODY PROTECTION (COUPE).

Recycling

Catch and dispose of drained coolant in a suitable container.

Transmission fluid emerges when oil lines are detached from heat exchanger.

Catch and dispose of escaping transmission fluid in a suitable container.

Observe country-specific waste-disposal regulations.

Release and disconnect coolant hoses (1).

Unlock transmission fluid lines (2) and detach.

Release screw (3).

Tightening torque 17 11 4AZ, see ENGINE RADIATOR .

Remove heat exchanger (4).

Fig 1: Identifying Coolant Hoses And Transmission Fluid Lines With Heat Exchanger

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Assemble engine.
Check fluid level in automatic transmission. If necessary, top up transmission fluid. See 00 11 237 CHECKING/TOPPING UP FLUID LEVEL IN AUTOMATIC TRANSMISSION (GA6HP19Z)
.