A/C Compressor Zener Diode to stop radio popping

kneale at coslink.net kneale at coslink.net
Thu May 7 08:30:57 PDT 2009

I've done the Audi-suggested mod by purchasing their expensive harness with
the Zenner attached.  

Bernie Benz probably has a cheaper approach available.
Original Message:
From: Kenneth Keith auditude at gmail.com
Date: Thu, 7 May 2009 08:26:49 -0700
To: 200q20v at audifans.com, quattro at audifans.com
Subject: A/C Compressor Zener Diode to stop radio popping

Hey Listers,

Does anyone know where I can find the appropriate Zener Diode to use
with the a/c compressor (patient is a 200q20v) to stop the feedback
popping when the clutch cycles?  I found some on Mouser.com but they
are sold by large quantities and I just need one.
http://www.sjmautotechnik.com says it needs to be one with an 18v
breakdown voltage.

Has anyone done the mod?  It's described here:


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