[s-cars] 95.5 S6 No/Low Heat

[vfugman at gdinet.com]

But isn't there still a valve in the coolant line to the heater that is 
closed when the climate control system is not in use?

Channel 51 shows the coolant temperature (in degrees C) that the 
climate control is seeing--I assume the sensor is somewhere close to the 
heater core.  As long as the valve is open, this should more or less 
correspond with the operating temperature on the dash gauge.

I've noticed that in winter in my car the Channel 51 reading only gets 
close to 87C (my thermostat temperature) in slow speed city driving.  At 
highway speeds, it is usually no more than 79C.  I've also noticed that 
at highway speeds the car will cool off quickly when going down a long 
hill.  At -10F ambient a 1/2 mile downhill stretch with foot off the gas 
will cause a significant drop in both the Channel 51 reading and the 
dashboard temp gauge.

One more climate control story:  For two years I didn't have any 
defrost or floor heat--the central flap motor was stuck so all the heat 
came out the dash vents.  I kept a clip-on 12V fan handy to use as an 
emergency defroster, although I didn't need it often as long as I parked 
in the garage overnight.  The cool and amazing thing to me is that after 
two years of being stuck it started working again, and has been for the 
last couple years.  Nice that I didn't have to pull apart the dashboard 
after all!

Varon
'95 urS6 getting to play in the snow again today!


On 05.02.2016 09:45, Peter Golledge wrote:
> Heater should be hot all of the time since the flap regulates temp 
> not a
> valve like earlier type44.  I would back flush with a garden hose 
> adapted
> with some hardware store fittings, don't use massive pressure 
> though... can
> rupture the core!
>
> Having said that, motor brushes wear down, I'd replace the servo 
> while you
> are in there.
>
> On Fri, Feb 5, 2016 at 8:18 AM, Paul Luevano <paul at clarity.net> 
> wrote:
>
>> On 2016-01-08 09:07, Paul Luevano wrote:
>>
>>>
>>> List-
>>>>
>>>> It's getting cold in the northeast, so of course the heat in my S6 
>>>> is
>>>> getting flaky.
>>>>
>>>> Noticed the other morning that the car was never heating up.  It 
>>>> usually
>>>> gets to temperature, even on the coldest mornings, in 5-10 
>>>> minutes.  Now,
>>>> at the end of my (admittedly short commute), the car is barely 
>>>> starting to
>>>> warm up.
>>>>
>>>> Did a little digging this morning, and while the dash gauge is 
>>>> showing
>>>> normal temp (thermostat just replaced in preparation for the 
>>>> winter), no
>>>> matter where I set the climate control settings (dash, floor, 
>>>> center vents,
>>>> etc.), it is blowing cool to luke warm air at best.
>>>>
>>>
>>         Just revisiting this issue.  I had assumed it was likely a 
>> faulty
>> temp flap servo, but when I dug into it, the servo was moving freely 
>> as I
>> cycled from "Lo" to "Hi".
>>
>>         I *did* notice that while the lower heater hose feeding the 
>> heater
>> core, the upper return hose was, at best, luke warm.  Good photo 
>> here:
>>
>>
>> 
>> http://i187.photobucket.com/albums/x242/austinado16/Audi%20A6%20temp%20control%20motor/P1020989_zps1623b883.jpg
>>
>>         I did bring up the CC codes, and all I got was a "15.7 Air 
>> Flow
>> Flap, sporadic block".
>>
>>         Now what is odd, is every now and then, I will get full 
>> heat.
>> Seems like once the car is up to temp, if I shut it down, and 
>> restart, I
>> then have heat.
>>
>>         Any idea what I should look at next, what channels on the CC 
>> head
>> I should be looking at for insights?
>>
>>         Thanks!
>>
>> Paul Luevano
>> Wakefield MA
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