Question about fan blower (search didn't come up with answers)

[angrypancake]

Hooray for the 1000th post. I think I'm becoming a post whore in training. Who wants an apprentice? Jeff....?

[dacoyote]

Hooray for the 1000th post. I think I'm becoming a post whore in training. Who wants an apprentice? Jeff....?

I am Jeff's Apprentice... you can be mine

[pundit]

..none that helpled me anyway.

When i first bought the car the fan was working fine. I have the dual climate control. Every stage/strenght of the fan was functional. Then it stopped working except when turned to the maxiumum. Since then it would surprise me by actually blowing at levels other than max, but that were rare times. Its either 0 or 100%.

Anyone know where to start? It's not a major problem but i'd like to get it fixed. Thanks everyone

If your car is an '89 model, you'll have a 'sword' module. A fairly common problem that occurs is the failure of several mosfet transistors mounted on the 'sword' itself.
However, because the variable speed control is working intermittantly the problem won't be caused by failed mosfet transistors. If they had failed the varispeed function wouldn't work at all. As Winfred said it could be a faulty relay. Another possiblity is fractured solder joints where the connector meets the printed circuit board.

Anyway mine had exactly the same symptoms as yours and this is how I tracked down the cause and fixed it.

Sword Module Repair

Shogun reposted my original thread on another forum.
I can't seem to find the original thread I posted on bimmer.info?

Good Luck!