Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Cooling Fan Replacement
 
Bookmark and Share

Pelican Technical Article:

Cooling Fan Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$300

Talent:

*****

Tools:

Set of sockets (10mm), wrenches, screwdrivers, 32mm fan wrench, coolant pump counter-hold tool

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Cooling fan(s), viscous clutch, drive belt

Hot Tip:

Work with a cool engine.

Performance Gain:

Car will cool down again

Complementary Modification:

Change serpentine belt.

BMW Z3 cooling system components include:

  • Radiator and coolant overflow tank.
  • Belt driven coolant pump bolted to the front of the engine block.
  • Belt driven fan attached to front of coolant pump. Viscous clutch controls fan speed based on engine temperature and rpms.
  • Electric (auxiliary) cooling fan attached to front of radiator. The cooling fan is controlled by the engine control module (ECM) via an output final stage.
  • Electrically heated thermostat.
  • Automatic transmission cooler or heat exchanger (if equipped).
  • Heater valve and heater core (for climate control).
  • Coolant level sensor inside expansion tank.
  • Coolant temperature sensor at cylinder head.
  • Radiator outlet temperature sensor
  • Coolant hoses and lines.

Cooling fans help to maintain a constant engine temperature, drawing air past the radiator cooling fans and cooling the engine coolant. The belt-driven cooling fan with a viscous clutch is attached to the engine coolant pump. On this fan, the fluid in the viscous clutch is affected by engine compartment temperature and in turn controls fan speed.

The electric fan is mounted on the front of the radiator. The electric fan final stage is mounted to the fan and is controlled by the engine control module (ECM). 

When replacing the belt-driven cooling fan, be sure to work with the engine cold; disconnect the battery's negative cable. Disconnecting the negative battery cable prevents the electric cooling fan from starting while being serviced. The fan could start at any time and personal injury can occur, so don't skip this step.

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

The cooling fan removal procedure differs slightly between 4 and 6-cylinder models. I will note the difference as needed. Some Z3 models may have an electric engine side-cooling fan. If so, to remove it, unplug the electrical connector. Then remove the shroud following the steps below. Skip the steps where the viscous fan is removed.

Do not remove the expansion tank cap or work on any other part of the cooling system while the engine is hot. Coolant or hot steam may escape and will scald you. To do any work on the cooling system, wait until the engine has cooled off.

To avoid marring the paint and trim, work with a plastic prying tool or wrap a screwdriver tip with masking tape before prying out body or interior items.

Keep in mind that when your car was serviced before, parts may have been 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. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. 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.

Belt-driven cooling fan:
4-cylinder: Working at the top of the radiator support, remove the two 10mm plastic cover fasteners.
Figure 1

4-cylinder: Working at the top of the radiator support, remove the two 10mm plastic cover fasteners. (green arrows)

4-cylinder: Lift up and remove the plastic cover from the radiator support.
Figure 2

4-cylinder: Lift up and remove the plastic cover from the radiator support.

4-cylinder: Remove the air duct from the cooling fan shroud.
Figure 3

4-cylinder: Remove the air duct from the cooling fan shroud. If needed release the retaining straps.

4-cylinder: To release the retaining straps, unclip the hook using a flathead screwdriver.
Figure 4

4-cylinder: To release the retaining straps, unclip the hook using a flathead screwdriver.

Using a 32mm wrench on viscous coupler hex, loosen in clockwise direction while counter-holding the water pump pulley.
Figure 5

Using a 32mm wrench on viscous coupler hex, loosen in clockwise direction while counter-holding the water pump pulley. If you cannot loosen viscous coupler from coolant pump, there is a special tool to counter-hold coolant pump, available here Part #PEL-TOL-3008.

4-cylinder: Working at the top corners of the cooling fan shroud, remove expansion rivets (green arrows).
Figure 6

4-cylinder: Working at the top corners of the cooling fan shroud, remove expansion rivets (green arrows).

6-cylinder: Working at the top corners of the cooling fan shroud, remove expansion rivets (green arrows).
Figure 7

6-cylinder: Working at the top corners of the cooling fan shroud, remove expansion rivets (green arrows).

Use a trim panel tool to lever out the expansion rivet center, then pull rivet (green arrow) out of cooling fan shroud.
Figure 8

Use a trim panel tool to lever out the expansion rivet center, then pull rivet (green arrow) out of cooling fan shroud.

Now, you can unscrew the viscous fan coupler from coolant pump and remove from engine compartment with fan shroud.
Figure 9

Now, you can unscrew the viscous fan coupler from coolant pump and remove from engine compartment with fan shroud.

If replacing fan blades: Note position and direction of fan blades.
Figure 10

If replacing fan blades: Note position and direction of fan blades. Then remove three 5mm Allen fan blade fasteners (green arrows). Install new fan to viscous coupler and tighten fasteners. When installing, lower the shroud into engine compartment, lower shroud with fan into engine compartment, screw cooling fan onto coolant pump in a counter-clockwise direction (left handed thread). Once hand tight, use a 32mm wrench and coolant pump holding tool and tighten. Install shroud, be sure it is flush with radiator. Then install expansion rivets. Install ducts and plastic cover. 

 Auxiliary cooling fan: To replace electric cooling fan mounted at front of radiator, you will have to remove the front bumper. See our tech article on Front bumper removing. Working in trunk, disconnect battery negative cable and cover battery terminal so cable does not accidentally come in contact with disconnected cable. See our tech article on battery replacing for notes on disconnecting and reconnecting battery.
The auxiliary cooling fan is mounted behind the power steering cooling loop.
Figure 11

The auxiliary cooling fan is mounted behind the power steering cooling loop. You do not have to remove the cooling loop to replace the fan.

Working on the right side of the cooling fan, remove the three 10mm fasteners (green arrows).
Figure 12

Working on the right side of the cooling fan, remove the three 10mm fasteners (green arrows).

Working on the left side of the cooling fan, remove the three 10mm fasteners (green arrows).
Figure 13

Working on the left side of the cooling fan, remove the three 10mm fasteners (green arrows).

Working at the bottom left side of the cooling fan, disconnect auxiliary fan electrical connector by squeezing tabs and pulling the connector straight off.
Figure 14

Working at the bottom left side of the cooling fan, disconnect auxiliary fan electrical connector by squeezing tabs and pulling the connector straight off.

Slide the cooling fan down out of the radiator support and remove from the vehicle.
Figure 15

Slide the cooling fan down out of the radiator support and remove from the vehicle. With cooling fan removed, clean any debris from cooling fans and radiator support. To install new fan, reverse steps of removal.

Bookmark and Share
Comments and Suggestions:
Frank Comments: I have a 2000 BMW Z3. I am looking for the pusher FAN BLADE ONLY.
It's also called the auxiliary condensor fan.
Do you have the blade available?
May 7, 2016
  Followup from the Pelican Staff: Pelican parts should b able to get it to you.

I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. - Nick at Pelican Parts
 
CHUCK HYLTON Comments: I NEED MORE INFO ON HOW TO REMOVIE THE AUXILARY FAN FOR REPLACEMENT
March 16, 2016
  Followup from the Pelican Staff: You didn't mention for what vehicle. If for a Z3, look here:

http://www.pelicanparts.com/BMW/techarticles/BMW-Z3/18-WATER-Cooling_Fan_Replacement/18-WATER-Cooling_Fan_Replacement.htm - Nick at Pelican Parts
 
nick Comments: im a bimmer fan
March 5, 2015
  Followup from the Pelican Staff: Cool. - Nick at Pelican Parts  
Phil Comments: In the text next to Figure 9 you say to unscrew the viscous coupler but you don't show how to do that in the picture. Help!
July 8, 2014
  Followup from the Pelican Staff: Unscrew it in the same direction when loosening it. CLockwise. Just spin the fan blades until it unscrews from the water pump. - Nick at Pelican Parts  

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Sun 12/11/2016 02:06:48 AM