Re: A/C, Radio, Arrrrrg!

[mike posner <posne@cts.com>]

Elliot writes re problems eith ac controls and noise in rr speaker when ing
switch on /off.  Does the speaker popping/noise coincide with cycling
on/off of a/c compressor/
and do you have the bose speakers?  If so the problems with both the a/c
control and the speaker pops or clicks may be the result of a voltage spike
backing up the hot wire to the air cond. clutch.  If so, a Zener diode (NTE
part # 4926) wired in line with the
acclutch hot wire, effectively allows current to go one way only, to the ac
clutch
(arrow on the diode points down. Any spiking, current backing up the wire
goes to 
ground, thus eliminating the two problems.Audi  has a tech bulletin
(#92-02- group 87)
and they sell a diode and wire harness for about $100 or $250 installed as
I recall.
I found the above NTE part at a local electronic store for $2.00 and it
still works fine.
Hope this works for you.  Mike.