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Subject: here the expert answer Author: shogun (moderator) : member since March, 2004 : 12550 posts Posted on: 2007-05-10 08:45:35

Checked with my friend Reinhard in Germany and sent him the pics, answer:

For sure that sword can be saved and will work again!
Best is to use BUZ11, they can stand more than the original ones.

In case the fan now only switches off while switching off the ignition, then one or several of the MOSFET's in the sword are defective and give permanent signal to run.
This has nothing to do with the relay in the sword handle (what I suspected in my above post/comment by shogun)
This relay only activates at "max fan speed" adjustment respect. defects.

The BUZ 74 have 12A and 40 Watt, the BUZ11 have 25-30A and 75 Watt!

To cover the soldered items and protect them against moisture and damages, he either to use UHU hard (if you have that in the U.S.), that is a glue which dries quickly,suitable for flexible material and all materials, moisture resistant and heat resistant from -50 to 100 degree celsius. Or ahny other glue to protect the soldered items.

Or a 2-component glue, if you want to make it faster to dry. It should seal all to protect against moisture, that is the most important. And of course it must be resitant against certain temperatures as mentioned above.
So any all purpose glue will do probably.

Let us know how the result is and maybe you make new pics.

shogun >>E32 750iL<< 11/88
7 series Tech tips
http://tinyurl.com/3486c

• So this is why my fan would always run- (pic) - stevebu 2007-05-09 18:54:04 (803 views)
  • give it a try (url) - shogun 2007-05-09 21:22:05 (501 views)
    • I will -as always, thanks for the info! - stevebu 2007-05-10 06:34:03 (363 views)
      • here the expert answer - shogun 2007-05-10 08:45:35 (583 views)
        • Excellent info, again. - stevebu 2007-05-10 19:29:38 (268 views)
          • make some nice pics of the repair. Thanks (nt) - shogun 2007-05-10 21:49:08 (329 views)
            • I have some pics and some tips (pic) - Shayne 2007-05-11 23:57:35 (9702 views)
              • Question: Pic 14 'And insert into the PC board': - stevebu 2007-05-12 08:20:59 (400 views)
                • Re: Question: Pic 14 'And insert into the PC board': - Shayne 2007-05-12 13:20:45 (308 views)
                  • Nice, I'll order up the mosfets. - stevebu 2007-05-12 14:43:27 (335 views)
              • And I should have mentioned (pic) - Shayne 2007-05-12 00:17:22 (1108 views)
                • Brilliant stuff Great Info Thanks. (nt) - slydon 2007-05-12 05:06:22 (294 views)