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There's a relay for the high speed under the black (archive)

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Posted by Bill R. on July 30, 2001 at 13:52:22:

In Reply to: Re: Tried rebuilding sword no improvement..help... posted by keith 1994 530ia on July 30, 2001 at 13:42:19:

cover on the handle of the sword. If you remove the cover you can see the relay. That relay controls the high speed only. So if you still just have high speed then the final control is still in the sword.

My car has the resistors (which I just replaced for the same problem), rather than the sword, but the principle should be similar. The sword acts as a resistor to current flow and the amount of this resistance determines the current flow to the fan motor, hence the fan speed. On high speed, the current bypasses the sword and goes directly to the fan motor giving the max fan speed. Look in Bentley's at the wiring diagram and locate the wires where the current flows into the sword on a particular switch setting (several) and also the wire where the current flows out of the sword to the fan. On any particular setting, you should be able to create a short (with a wire) across the incoming current wire for that setting (+) and the outgoing wire to the fan (-). If the fan operates (on high in all cases) in this manner, then you are getting current to the sword and the ground to the fan (-) is also good, so the problem must be with the sword. You can also just measure the voltage potential between any of the (+) wires wires and ground. Since the fan does operate, the motor is obviously good, as well as it's ground.

keith
1994 530ia

question to those that may be able to help.

I replaced Mosfets, reinstalled and still only fan at position 4, high,

Is there a way to check this SWORD out to be sure it is the problem?

Is there a way to put an in line resister or variable speed control to replace existing system and wire directly to fan motor?, I would be willing to install seperate devise somewhere hidden if it would work.

Before I fork over the 150.00 or so I would like to concusivly know I am replacing the right part, does anyone elase have any suggestions?

Feel free to e-mail me directly with suggestions, [email protected]

Thanks,, Mike






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