Replacing the MFTS

[michael]

Contacts are covered with many layers of dried coolant (it took me 3  
years to find this leak - when the engine is warm it evaporates near  
the leak and is not easily located - only drops on the snow when cold  
and only just drops).  I ordered a new connector and will cut the  
wires back 6" and solder in new when installing.

On Apr 4, 2008, at 11:27 AM, jake falk wrote:

> how clean are the wires that connect to the MFTS?  I had a problem  
> where I replaced the old one it worked (thats didn't work) just  
> like before.  My old one was also leaking.  I pulled it apart and  
> gave it a good cleaning.  Probably could have still used the old  
> one.  Just ask Bernie!
>
> On Fri, Apr 4, 2008 at 11:39 AM, michael <mdearing at mhtc.net> wrote:
> Gentlemen,
>
> there has been discussion of the MFTS on this list.  It appears
> replacement is not as straightforward as it would seem.
>
> Coolant leak discovered at MFTS.
> Audi replacement MFTS has 3 terminals instead of the original 4.  The
> +Battery terminal has been eliminated.
> After installing the 3 terminal MFTS, the temperature gauge does not
> work.
>
> I installed the same 3 terminal MFTS in a 5000 and the temp gauge
> works there.
>
> The voltages on the wires coming from the mating connector (to the 3-
> terminal MFTS) are as follows.
>
> 5000:
> 10V      12.5V
> +Bat      10V
>
> 200tq20v:
> 10V      9.4V
> 0V        10V
>
> What's causing the difference here?
>
> The wiring diagram shows one of the wires going to the instrument
> cluster.
> Could this be an artifact of my flaky instrument cluster (which I
> have resoldered, etc. but which still acts up)?
>
> - Michael
>
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>
>
> -- 
> Thanks,
> Jake Falk