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E-Box Cooling Fan Replacing
 
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Pelican Technical Article:

E-Box Cooling Fan Replacing

Nick Czerula

Time:

2 hours2 hrs

Tab:

$75 to $105

Talent:

***

Tools:

Phillips head, T25 Torx, string

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

E-box fan

Hot Tip:

Disconnect battery to prevent damage

Performance Gain:

Properly operating control module

Complementary Modification:

Clean e-box of debris

BMW Z4 models have a sophisticated electronic control system. At the heart of the system are computers (control modules) used to make decisions based on sensor and user inputs. The engine control module (DME) and transmission control module (TCM) work in conjunction to provide the best driving experience. They share inputs and data across communication circuits; this helps to cut down on wire and the number of sensors used. The computers are programmed with base parameters and utilize sensor inputs to make adaptations and control component outputs as needed.

The DME is housed in the E-box, located in the left rear of the engine compartment. The DME, relays and fuses are in this central location to keep wiring to a minimum. The box is cooled by an electric fan. The fan feeds air to the DME cooling shroud, then to the DME.

If this fan fails, the DME can overheat causing a failure. If you have a noisy fan, usually heard as a scraping under the left side of instrument panel, check the fan and replace it if needed.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below.

Disconnect the negative battery terminal. See our tech article on battery replacing.

Then, remove the coolant reservoir. See our tech article on coolant reservoir replacing.

The e-box fan is located under the instrument panel on the left side near the firewall (red arrow).
Figure 1

The e-box fan is located under the instrument panel on the left side near the firewall (red arrow).

Working in the footwell, remove the Phillips head screw from the hood release lever (red arrow).
Figure 2

Working in the footwell, remove the Phillips head screw from the hood release lever (red arrow). Then remove the handle (inset).

Working in the footwell, remove the Phillips head screw from the footwell trim (red arrow).
Figure 3

Working in the footwell, remove the Phillips head screw from the footwell trim (red arrow).

Working at the door sill, remove the Phillips head screw from the footwell trim (red arrow).
Figure 4

Working at the door sill, remove the Phillips head screw from the footwell trim (red arrow).

Remove the footwell trim from the vehicle.
Figure 5

Remove the footwell trim from the vehicle.

The e-box lid has to be removed.
Figure 6

The e-box lid has to be removed. Start by loosening the T25 Torx screws (red arrows).

Remove the e-bod lid.
Figure 7

Remove the e-bod lid. Lift up at an angle and detach the tabs.

With the lid removed, you now have access to the fan electrical connector (red arrow).
Figure 8

With the lid removed, you now have access to the fan electrical connector (red arrow). Unlock the tab (purple arrow) and push the connector down to detach it from the e-box. I use a pick and a hook tool to do this, as hands won't fit (lower inset).

Disconnect the electrical connecter, then attach a string to it (red arrow).
Figure 9

Disconnect the electrical connecter, then attach a string to it (red arrow). This will help when feeding the new fan wiring into the e-box.

Working at the fan, remove the three Phillips head screws (red arrows).
Figure 10

Working at the fan, remove the three Phillips head screws (red arrows).

Then slide the fan out of the e-box (purple arrow).
Figure 11

Then slide the fan out of the e-box (purple arrow). Feed the connector down (red arrow) with the string attached.

If you need to separate the fan from the housing, remove the Phillips head screw (red arrow).
Figure 12

If you need to separate the fan from the housing, remove the Phillips head screw (red arrow). Reverse steps to install the new fan. Be sure to pull the wiring harness and connector up and mount it to the side of the e-box. Reverse steps to reassemble.

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Page last updated: Mon 12/5/2016 03:02:33 AM