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Engine Cooling Fan Replacement
 
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Pelican Technical Article:

Engine Cooling Fan Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

T25 Torx driver, flat head screwdriver, trim panel tool

Applicable Models:

BMW Z4 Coupe/Conv (2006)

Parts Required:

Engine cooling fan

Hot Tip:

Work with a cool engine and clear DME fault codes when done

Performance Gain:

Proper engine cooling

Complementary Modification:

Inspect radiator and coolant hoses

The cooling fan on BMW Z4 models is electronic and controlled depending on engine temperature and a/c operation. The main job of the cooling fan is to draw ambient air across the cooling fins of the radiator to lower engine coolant temperatures. Usually the fan will only run when the vehicle is stationary or at low speeds, when airflow across the radiator needs to be increased.

BMW Z4 models utilize an electronic cooling fan integrated into the cooling fan shroud. When repairing, the cooling fan and shroud are replaced as a unit. The cooling fan is responsible for maintaining proper engine coolant temperature and A/C cooling. When a BMW Z4 cooling fan fails, the fan will not activate or only activate at high speed. You can check cooling fan operation by turning on your air-conditioning and listening for the fan to activate.

When replacing your electronic cooling fan, you will want to work with the engine cold and disconnect the battery's negative cable. Disconnecting the negative battery cable will prevent the electric cooling fan from starting while being serviced. The fan could start at any time and personal injury can occur. Don't skip this step.

For a quick test of the fan, turn on your A/C. The fan should come on. If it does not, it may be faulty. You can also try unplugging your coolant temperature sensor. The fan should run on HIGH. Keep in mind with this technique, a fault code will be set and have to be cleared. Or you will be stuck with a check engine light for a few days until it automatically clears.

Remember that your car may have been serviced before and had 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 you're 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. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Working in the trunk, disconnect the battery negative cable and cover the battery terminal so the cable does not accidentally come in contact with the terminal. See our tech article on battery replacing for notes on disconnecting and reconnecting the battery.

Remove the engine splash shield. See our tech article on splash shield removal for more info.

The cooling fan on BMW Z4 models is electronic and controlled depending on engine temperature and a/c operation.
Figure 1

The cooling fan on BMW Z4 models is electronic and controlled depending on engine temperature and a/c operation. The main job of the cooling fan is to draw ambient air across the cooling fins of the radiator to lower engine coolant temperatures. Usually the fan will only run when the vehicle is stationary or at low speeds, when airflow across the radiator needs to be increased. The fan is mounted to the engine side of the radiator (red arrow).

Working at the top of the radiator support, remove eight Phillips head screws (red arrows and the two T25 Torx fasteners (green arrows).
Figure 2

Working at the top of the radiator support, remove eight Phillips head screws (red arrows and the two T25 Torx fasteners (green arrows).

This photo shows a close up of one of the eight Phillips head screws (green arrows) with the plastic anchor (inset) and theT25 Torx fastener (red arrows).
Figure 3

This photo shows a close up of one of the eight Phillips head screws (green arrows) with the plastic anchor (inset) and theT25 Torx fastener (red arrows).

Lift the radiator support trim in the direction of the red arrow to remove it.
Figure 4

Lift the radiator support trim in the direction of the red arrow to remove it.

The cooling fan is now uncovered (red arrow).
Figure 5

The cooling fan is now uncovered (red arrow).

Working at the right side of the cooling fan, disconnect the cooling fan electrical connector by squeezing the release tabs (green arrows) and pulling it straight off the fan.
Figure 6

Working at the right side of the cooling fan, disconnect the cooling fan electrical connector by squeezing the release tabs (green arrows) and pulling it straight off the fan.

Working at the top of the cooling fan, remove the A/C sensor by pulling in the direction of the green arrow, then lifting up (red arrow) and removing.
Figure 7

Working at the top of the cooling fan, remove the A/C sensor by pulling in the direction of the green arrow, then lifting up (red arrow) and removing. Place it out of the way, on the right side of the engine compartment.

Working at the bottom of the cooling fan on the left side, remove the T25 Torx fastener (green arrow).
Figure 8

Working at the bottom of the cooling fan on the left side, remove the T25 Torx fastener (green arrow).

Working at the top of the cooling fan on the right side, remove the T25 Torx fastener (red arrow).
Figure 9

Working at the top of the cooling fan on the right side, remove the T25 Torx fastener (red arrow).

Working at the top of the cooling fan on the left side, remove the plastic rivet (red arrow).
Figure 10

Working at the top of the cooling fan on the left side, remove the plastic rivet (red arrow). Use a trim panel tool (inset) to lever out the center pin. Then remove the plastic anchor.

Lift the cooling fan up (red arrow).
Figure 11

Lift the cooling fan up (red arrow). Push it toward the right of the vehicle. Be sure it clears the radiator vent hose (green arrow). If clearance is too tight on your vehicle, remove the vent hose to prevent damaging it.

Then pull the cooling fan up (red arrow) and remove it from the engine compartment.
Figure 12

Then pull the cooling fan up (red arrow) and remove it from the engine compartment. Be careful not to snag the fan on wires or hoses when installing the new cooling fan. Slide the new fan down into the engine compartment. Move it into place and lock the retaining tabs. Be sure that the fan is properly seated in the radiator support. If the fan is giving you a hard time and will not drop all the way down, check to see if the bottom of the cooling fan is hung up on the radiator or hoses. Reroute the wiring harness and connect it. Install the engine splash shield and check the cooling fan operation. You can check its operation by running the engine and turning on the A/C. The cooling fan will run when the A/C is switched ON.


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Page last updated: Sat 12/3/2016 02:59:50 AM