[s-cars] temp gauge hokey pokey

[Paul Krasusky]

Great Vincent, thanks.  I'd have done that but left early yesterday due to
snow and didn't read this, and replaced the Tstat last night regardless.
Seems OK so far, but haven't had clear enough roads to do the
"redheadedstepchild beating" test yet to see.

Question, once I select Channel 51 (is this akin to AREA 51 maybe?), how do
I get it back to regular display?

Thanks again.

-Paulie Ignorant


-----Original Message-----
From: Dave Burig [mailto:dburig at igsenergy.com]
Sent: Friday, December 06, 2002 8:58 AM
To: Vincent Frégeac; 'Paul Krasusky'; 's-car-list'
Subject: RE: RE : [s-cars] temp gauge hokey pokey


Wow, great info, Thanks.  I suspect most of us will be commuting home
tonight with the "Channel 51" display on.
What else do these cars know that they're not telling us?  What buttons do I
have to push for it to tell me where that little blue puddle that
intermittently appears on my garage floor is coming from?

DB



-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Vincent Frégeac
Sent: Thursday, December 05, 2002 7:51 PM
To: 'Paul Krasusky'; 's-car-list'
Subject: RE : [s-cars] temp gauge hokey pokey


Paul,

After all this post about changing this or that, I'll add another way of
thinking: Do not use any tool!
- Start your car,
- On your heater control, press Recirculate and Up Arrow at the same
time,
- You should see 01c instead of the temperature, which means Channel 1
of your Heater Control ODB
- Press the Temperature "+" until you see 51c, channel 51
- Press the Recirculate again
and Shazzam, here is your coolant temperature, in Celsius, courtesy of
the ODB of the Heater Control and Rich who pointed me to the very
interesting www.12v.org/maint/cc.html

If the temp goes down on the Heater Control when you're cruising and go
up in heavy traffic, your T-Stat is shot. If your temp stays rock
stable, like mine, it's either your gauge or your MFTS. Usually a
MalFunctioning Temp Sender will intermittently display the right
temperature or fall down to 0, but who knows. Then, you can apply a
latter Rich's suggestion, plug an electrical resistance in the MFTS
plug. Rich suggested 40 ohms but the Bentley says 580 ohms for the 3
thick marks area and 58 ohms for the 90-110C area. You should see a
group of two small dot on your gauge in the 580 ohms and 58 ohms area
(May be it's only on CAN spec gauge). Anyway, according to the Bentley,
40 ohms should send your gauge way over 90C but I've no BTDT and it
seems Rich have played a bit with this problem, so take what Bentley
says with a grain of salt. I would have been happy to double-check the
right resistance on my S6 if I was not suspecting my gauge to be way out
of spec.

May be a lister with a proper temp gauge could do it for us. Anyone?

If your temp gauge react to fixed resistance the way it should, it seems
the MFTS have just invented another mode of failure. If the gauge gives
wrong readings, you can either change your gauge or wait until I pull
out my soldering iron and try to fix my gauge. My quest for 90C have
started several years, several Audis, several T-stats and several MFTSs
ago but may be the gauge saga will be the solution of this never ending
quest.

Good luck,


Vincent.