[s-cars] MFTS or Coolant Thermo Switch Leak and Malfunction.....

[LL - NY]

On my 200, when the MFTS started to leak, I simply opened up (actually,
since it disintegrated, removed) the boot. That extended the time to total
failure until the actually air temperature was a bit more friendly (why do
coolant system problems aways seem to happen in the winter?) since it the
"shorting" situation was averted by letting the sensor simply drain.

On Tue, Feb 16, 2010 at 12:17 PM, Thomas R Green <trgreen at comcast.net>wrote:

> Jim,
> The MFTS is self-powered so it does not need the 4th wire for 12V
> power.  They are all 3 wire now.
>
> They don't usually leak enough to notice the drop in coolant so
> quickly, so I recommend you take Wylie's advice and look close by for
> a leaking hose.  If the MFTS is indeed leaking, it is covered with a
> rubber boot that will be wet inside (and usually shorts out the
> connectors).  Tips?  Takes a big wrench  that is hard to get in
> there.  You can probably make a small turn with an adjustable wrench
> and then hand remove.  Be careful with the boot and connectors.  They
> are probably fragile by now.
>
> Tom
>
>
> > -----Original Message-----
> > Date: Tue, 16 Feb 2010 02:42:53 +0000
> > From: "Wylie Bean" <theringmeister at triad.rr.com>
> > Subject: Re: [s-cars] MFTS or Coolant Thermo Switch Leak and
> >       Malfunction.....
> > To: "Jim Fleischer" <jim at almgt.com>, s-car-list-bounces at audifans.com,
> >       s-car-list at audifans.com
> > Message-ID:
> >
> <500232977-1266288175-cardhu_decombobulator_blackberry.rim.net-1657698094- at bda390.bisx.prod.on.blackberry
> > >
> >
> > Content-Type: text/plain; charset="Windows-1252"
>  >
> > Jim,
> > Mine turned out to be a poorly-located hose clamp on what is/was
> > otherwise a new upper radiator hose where it meets the water
> > manifold.  It appeared to be leaking from the sensor, but upon
> > closer examination it was the hose, and not the one that runs
> > parallel with the head under the I'm.  I loosened the clamp, removed
> > the hose, cleaned the dried coolant from around the neck and
> > replaced the hose, aligning the clamp a little better, and tightened
> > it up. Survived a trip from Greensboro to Daytona and back with only
> > slight evidence of a seep. I think the hose is just indented where
> > the ckamp was and may take a few heat cycles to adjust to the new
> > clamp location.  I'll recheck it this weekend.
> >
> >
> > Wylie Bean
> > TheRingmeister at triad.rr.com
> > 90 cq
> > 91 90q20v
> > 92 UrS4
> > 08 Q7 3.6
> > Sent on the Sprint? Now Network from my BlackBerry?
> >
> > -----Original Message-----
> > From: "Jim Fleischer" <jim at almgt.com>
> > Date: Mon, 15 Feb 2010 19:23:38
> > To: <s-car-list at audifans.com>
> > Subject: [s-cars] MFTS or Coolant Thermo Switch Leak and
> > Malfunction.....
> >
> > Hey guys,
> >
> > Well, My s6 must have overheard Wylie's coolant leak troubles of a
> > few weeks ago and decided to act up on me......Just changed the oil
> > about 10 days ago and found the coolant to be a little low, so
> > topped it off and she's been leaking a bit more ever
> > since.....noticed the wires from the MFTS (I think) under the
> > manifold were wet, and today had the red blinking coolant warning
> > light go off.  Topped off with coolant, and the light is staying
> > on.  Just wanted to be sure this is what I think it is before I
> > order up and replace.  Anyone have a part # or an online source they
> > could help me out with?  I read on SJM that there are 3 and 4
> > terminal sensors.  Which one do I need?  Anything else it could be?
> > Tips on R&R?
> >
> > Thanks as always!
> >
> > Best regards,
> >
> > Jim Fleischer
> > '95 s6
> > '83 ur (For Sale)
>
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