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Electrical Fan

Author : Bruno Posted on : 05/12/2004
Model : BMW, 5 - Series (E34) 1989-96 Category : Engine - Cooling System
Source : http://www.bmwe34.net
 

Perma Cool 16" electrical fan.

After having some problems with my BMW E34 fan clutch, I decided to install an electrical fan. The cheapest is the one that has the most flow: the perma cool fan #771-19115. Buy it from summit racing or jegs ($89). Don't buy it from perma cool as they will charge you ($149.00, go figure...)
Basically, the advantage of the fan clutch is a very small HP increase because there is no draw of power from the engine. The back side is that if the thermostat fail or the electrical fan itself, well, you don't have any more fan.

You have two choices: Installing the fan directly onto the radiator (I would not advise to use the through the radiator straps, these fans are heavy and in time will bend the fins and the fan will sag) or installing it onto the fan shroud.

Procedure
  • Perma cool 16" fan.
  • Pliers, hammer
  • Electrical tools: multimeter, solder iron and crimp tool, shrink wrap and tie wraps.

    1.Remove the fan clutch and the fan shroud. To remove the fan shroud, there is two plastic pins on each side of the radiator that you have to remove. Pull up to remove the shroud.

    2. This is what will separate the boys from the men. See the fan, see the shroud... You have to bend the black tabs to fit the shroud.
    Well, guess what the fan must fit the shroud and must not touch the water pump pulley, the fan blade must not touch the radiator neither...
    No trick, just plain metal forming with basic tools... Good luck.

    3. And voila: the final product.
    I used 4 screws and nuts to hold the fan to the shroud. I welded two wires to the fan wire (they are pretty short) and used shrink wrap to protect the connection.

    a) Perma cool adjustable thermostat:

    3a. The easy way (I thought) was to buy the perma cool adjustable thermostat. All the wiring is included with the thermostat.
    The perma cool thermostat # 771-18905 includes all the wiring, in line fuses you need. Unfortunately, it doesn't seem reliable as mine failed 2 months later.
    Disconnect the battery.
    Black fan wire: to any ground screw.
    Red fan wire: to the yellow wire.
    4a. The documentation included in the kit is self explained. On the plug, keep only the red, black and yellow wires, the other wires are if you want the fan to run when the A/C is on. Remove them if you want (I did) as the E34/E32 has an auxiliary fan for the A/C.
    Red wire: connect it to the + connector. Remove the black cover, unscrew the nut and placed the wire with the inline fuse.
    Yellow wire: connected the the red fan wire
    Black wire: to any ground screw.

    b) Non adjustable thermostat with relay:

    • Thermostat NO 80C leaded bought at digikey (p/n 317-1021-ND) (Cantherm p/n: F1108015ACFA06E) $13.00
    • Any auto relay NO supporting 30A min.
    • 14 Gauge wires red and black.

    3b) Use a screw to screw the thermostat at the left of the radiator into the fins. Attach the wires to the shroud with a tie wrap.
    Follow the diagram to wire the relay.

    (Thanks ... Me for trying new things)
    •  

    Pictures

    Picture 1
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    Picture 7

    Click on the thumbnails to see larger images.

     

    References

  • http://www.bmwe34.net
    •  


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