A/C Compressor Zener Diode to stop radio popping
brett.dikeman at gmail.com
Thu May 7 10:04:21 PDT 2009
On Thu, May 7, 2009 at 12:52 PM, Henry A Harper III <hah at alumni.rice.edu> wrote:
>> Thanks Kneale. Do you, or does anyone reading, know whether this is
>> only required/helpful with the factory sound system or is there/would
>> there be popping with aftermarket components as well?
> I don't think I have ever heard any popping from the a/c compressor on the
> 12 year old aftermarket system in my car (Kenwood CD head + outboard amps).
> So I vote for Bose-only issue.
It's not a "bose-only" issue, and not all cars are affected, because
in some, they already have the diode. On the 200q20v there was a
recall to REPLACE (or install? I forget which now) the diode. It's
called inductive kickback:
...and the cause is the A/C compressor clutch's electromagnet. The
pop noise is from a large voltage spike. If you feel comfy plugging
your GPS/iPod/etc into the cig lighter with those spikes, be my guest
:) It's a cheap fix...
More information about the 200q20v