[s-cars] No heat diagnosis please

[Tom Green]

Hi Sam,

I was wondering how cold it would have to get before you got serious  
about this and
checked the codes.  :-)  You can move the temp regulator flap  
manually and get heat
but the motor won't move the flap-sounds like a problem diagnosed and  
ready to fix--
just replace the flap motor assembly.  What the hell do you want to  
keep testing for?

You can clear the fault codes the same way you clear ecu fault codes  
since that is what
they really are, just conveniently read on the cc head.  See the SJM  
web site for details
on code clearing--basically, pull ecu fuse in passenger footwell.

I wouldn't test too many of those little motor assemblies with  
battery power since they are
designed to run on 5.7V IIRC.  The potentiometers are inside the  
little motor boxes.  They
can be opened and cleaned but you have to be really good at miniature  
motor and switch
repair to have it work when you reassemble. Just buy one here:

http://www.fap99.com/epcvsoapimc.epc? 
cookieID=2390OV86Y2421CCZJG&drillid=8&subcatid=801060@@Air 
+Conditioning&clientid=fap99

Hopefully it won't be spring before it arrives.  :-)  I'm thinking we  
had much of this discussion before it
got really cold.

Tom

> Date: Tue, 19 Jun 2007 12:20:03 +1200
> From: Sam Clarkson <sam at edgetoedge.co.nz>
> Subject: [s-cars] No heat diagnosis please
> To: s-car-list at audifans.com
> Message-ID: <BCD01640-6FF1-41F2-926C-F97CBB586EE2 at edgetoedge.co.nz>
> Content-Type: text/plain;	charset=US-ASCII;	delsp=yes;	format=flowed
>
> Hi all
> 93 S4
> No Heat, I pulled the codes; 08.7 temp regulator flap sporadic block
> and 11.7 central flap sporadic block.
> I've pulled out the temp control motor assembly no movement as I
> cycle through the temp range. The arms all move freely and smoothly
> with the TCMA out and heat comes on/off when moving them manually.
> The motor in the TCMA goes fine in both directions when directly
> connected to a battery.
> Any advice as to what's next to test.
> The potentiometer? How?
> The supply to the TCMA? How?
> How do I clear/reset the codes?
> Getting the TCMA out is a BITCH on a right hand drive car, just in
> case you care!
>
>
>
> Sam Clarkson