[V8] Coolant Guage wackyness***Now IC board wackyness***

[urq]

I too have done a lot of work with the AT & MT versions of the cluster ...
swapping boards isn't that big a deal IME.  I've also swapped gauges between
boards ... so far only a clock, but the plan is to swap the speedo/odo from
the current cluster in #344 to the MT replacement when I do the exchange.
The other one that is straightforward is the instrument light dimmer ...
these also seem to be weak points. 

I'm seeing similar behavior to what Ron is reporting on #2 ... the one with
the 5-speed cluster.  Sometimes the coolant temp gauge reads dead cold and
sometimes it reads nearly overheating ... 

Years ago there was a lister who had an e-mail of "whitepatch" who reported
having a "Helm" manual for the cluster ... I tried a few things to get a
copy from them, but it always ended in them telling me that they didn't do
manuals for foreign cars.  I've got a 5-speed cluster under the knife right
now ... guess I should go ahead and figure out the circuitry for the coolant
gauge!

Has anyone here ever seen a detailed manual for the guts of the IC?  I doubt
Audi dealers had them as the IC is a FRU.  

Steve B
San José, CA (USA)

-----Original Message-----

Ron,

I did just that.  I also removed the light bulbs that illuminate the  
PRND321 display.  The right side of the IC is actually part of the  
whole black plastic IC gauge surround, so you can't just sub certain  
parts.  You'd need to swap the circuit boards.

Ingo

On Jul 4, 2007, at 11:41 AM, Ron Wainwright wrote:

> Ok, I checked the sensors & all are fine. I did/do
> have a spair 90 V8 Auto IC & for shit's & giggles I
> pluged it in & it works as it should. Coolant gauge
> stays were it should & as I let the car idle in the
> driveway it climed as it should.
>  So my question is....since the 5spd seemed to run all
> the IC functions from the Auto IC you think I can just
> swap the Board from the Auto to the 5spd?
>
>  Ron
>
> --- Ron Wainwright <ron_01056 at yahoo.com> wrote:
>
>> I'm going to look at the Sensor at the back of the
>> pass side head tomorrow. I got a few good ones I can
>> swap, & see what that does.
>>
>>  Ron
>>
>> --- Kneale Brownson <knealeski at sbcglobal.net> wrote:
>>
>>> I don't recall specifics, but I seem to remember
>>> Keith providing a longish explanation of how the
>>> gauge gets the coolant temperature report from a
>>> couple different sensors in the coolant system.
>>> Isn't there one on the radiator and another on the
>>> back of the passenger side head?  One or both
>> supply
>>> the signal to the gauge in the instrument cluster?
>>>
>>> Ron Wainwright <ron_01056 at yahoo.com> wrote:
>> Sending
>>> Unit Kneale???
>>>
>>> Ron
>>>
>>> --- Kneale Brownson wrote:
>>>
>>>> How about the sending unit itself?
>>>>
>>>> Ron Wainwright wrote:
>>>> Lister's, just trying to figure out if the
>>> processor
>>>> in the Instrument Cluster is fubar...or
>> what......
>>>>
>>>> Here's what's happening....the coolant guage
>>> needle
>>>> was sitting at 110C..car off, cold,
>>> hot.....doesn't
>>>> matter. So I took the IC out & replaced the
>>> coolant
>>>> guage itself. I go to hook the #2 Black
>> connector
>>> at
>>>> the back of the cluster & the needle goes from
>>> 50C,
>>>> to
>>>> 110C. I unplug the Black #2 connector & it goes
>>> back
>>>> to 50C.....is the processor fubar?? wire in the
>>>> cluster?.....any suggestions?