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Loose connector, or bad control unit (archive)

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Posted by Clyde on June 27, 2000 at 04:02:49:

In Reply to: A/C blower not working? (more) posted by Daytona Nick on June 25, 2000 at 15:58:07:

I have a similar problem on my 97 M3, except the blower jumps from full speed to off to normal. There is a control unit (forgot official name) mounted in the a/c duct which "drives" the blower. It serves the same purpose as the resistor packs in earlier cars. The unit can be found by removing the panel under the driver's side dash, and looking up into the center console. It has a 5 pin connector, and is held in with 2 torx screws. In operation, it gets very warm.
Here are 2 possible causes to our problems:
1) The connector pins get loose over time, due to the expansion/contraction of the hot unit.
2) The unit is bad. It is epoxy potted, so there is no way to inspect the inside.
I first experienced this problem over a year ago, but it has only become frequent enough for me to investigate over the last few weeks. I have not solved the problem yet. If you "wiggle" the connector, your fan might start working.

BTW Do not run the A/C when the blower is not working -- the condenser will freeze, and could be damaged.

Clyde 97 M3
(overheated driver)

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