MFTS frequent failure

[Cody Forbes]

Let's do some clarifying first. 

What is the failure mode? 

What problem is it causing? 

Are you certain it is the MFTS? That has little to do with A/C (it disables A/C if the engine overheats, nothing more) and you seem to be talking about an A/C problem. It's main function is to run the temp gauge on the dashboard. If you are having it constantly disable A/C you could just disconnect that one wire from it, but be sure the engine is cooling properly first.

-Cody (mobile)

On Jul 2, 2011, at 9:29 AM, gschesel <gschesel at gmail.com> wrote:

> Any BTDT installation tips with the multi-function temp sensor for the I5?
> My '91 100 needs a replacement; again.  They seem to last only a few days or
> weeks.  I know the converted R134 pressure is OK plus the CC channel
> read-out shows it as OK.
> 
> The MFTS was replaced in spring of 2010 but quit working shortly thereafter;
> leaving me without summer cooling.  I would try again if I can be more
> confident of it lasting.
> 
> Are there any resistance values between connector pins that indicate when
> good or not good. Are there resistance or volts readings at the harness
> connector that would be useful?  I have the Bentleys and can do research
> there.
> 
> This has been annoying and expensive; especially when my '91 200 has the
> same sensor since my acquisition in 2002.
> Are there newer non-Audi versions I can try?
> 
> Thanks
> Gordy in St Paul
> 91 100 251k
> 91 200 20v 118k
> 05 allroad 87k
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