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

[Thomas R Green]

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)