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Old 10-14-2011, 11:31 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
It would be nice for those of you who replace your DISA, to confirm the new information we're finding about the DISA 12-volt magnetic solenoid and the 1/16" hole that allows vacuum to accumulate to open the flap when the 12 volts uncovers the one-way check valve.

Sadly, to my knowledge anyway, NOBODY (to date) has adequately explained HOW the DISA actually works!

Luckily, the knowledge has been growing exponentially lately, and is scattered about, but should be summarized here:
Here are the scattered research bits:
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