A/C Stereo Clicking--Which Relay? (Modified by Bob Reinhardt)
bobh at reinhardtmail.net
Sun Jun 27 02:00:00 EDT 2004
Hi, Bernie (and those interested),
Just a quick e-mail to let you know that I pulled the relay and that
did stop the clutch and the popping. So I've got the right relay.
I've just got to find the right path. Might I just replace both
Thanks again for all of your help.
On Jun 26, 2004, at 4:41 PM, Bernie Benz wrote:
> Looks like you have the right relay. It's been a long time since I've
> these relays opened, The 200 had a shorted diode, causing the
> compressor to
> run all the time. The 90 had an open diode, causing the electrical
> If you pull the relay you should have no comp. clutch action and no
> electrical disturbance, Yes? Trace out the circuit on the relay pc
> Bentley pg. 590 is wrong, showing the clutch supression as being a
> instead of a diode. The diode, like the capacitor shown, is across the
> relay contacts, anode to pin 87 and cathode to pin 30. The other
> diode is
> likely the relay coil suppression diode, across the relay coil.
>> From: Bob Reinhardt <bobh at reinhardtmail.net>
>> Date: Sat, 26 Jun 2004 15:08:17 -0700
>> To: Bernie Benz <b.benz at charter.net>
>> Subject: Re: A/C Stereo Clicking--Which Relay?
>> Hi, Bernie,
>> Thanks for your quick response; always good to get your words of
>> wisdom. Everything looks to be right as to which relay I pulled:
>> Item Number: 295
>> Part Number: 443 919 578 F
>> Location: Middle row, last on right (position 1)
>> Furthermore, the relay contacts seem to be right: 31, 30, 87, 87a, and
>> a middle one labeled "T".
>> I checked the diode I removed, and my mulitmeter says it's just fine,
>> which I thought was weird, but chalked up to my lack of expertise in
>> electronics manipulation.
>> I'm puzzled, but it's a feeling I'm getting used to with my beloved
>> Audi. Any thoughts would be much appreciated.
>> Thanks again for all your help.
>> On Jun 26, 2004, at 2:43 PM, Bernie Benz wrote:
>>> That relay doesn't look at all like the AC relays that I have been
>>> into and
>>> replaced diodes in. As I recall, there are two black diodes tightly
>>> squeezed on the board very close the the pin header. No such luxury
>>> of the
>>> wide open spaces that you show. Does the part number, item number
>>> location jive with what I detailed to you? I think you have the
>>> relay. Did you check the diode that you removed. It should be open
>>> your symptom.
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