[s-cars] Project S6 hot but no heat

[Andy Schor]

New fan/clucth assembly installed, enthusiastic test drive, back to the shop 
with a rising temp gauge...again.  No heat output through the HVAC system. 
The rad was hot (so not blocked) as were  both hoses.  After-run fan 
functional.  Checked thermostat for improper installation, looks like there 
is only one way it fits in the housing.   Tested thermostat in boiling 
water.

Maybe an air pocket in system?  Try a vacuum pump?

Other suggestions, BTDTs?

Thanks,

Andy

----- Original Message ----- 
From: "Andy Schor" <walbum1 at verizon.net>
To: <s-car-list at audifans.com>
Sent: Monday, August 16, 2010 11:18 AM
Subject: Re: [s-cars] Project S6 on the road again in Pittsburgh


>I actually figured (now confirmed by you) that the fan was heat/viscosity
> motivated, I did not remember the term, 'dilatantic'  I drove the car for
> about 20 minutes (ambient ~85*F), showing  normal 12 o'clock on the temp
> gauge.  I opened the hood and confirmed operation of the A/C fan but the
> main fan seemed to be lollygagging, as if I could stop it with my hand.
> Judgement being relative, I discovered that was true.
>
> Since the head was rebuilt I figured all the ancillary bits were new,
> apparently not.
>
> A new fan has been ordered, finally something to replace that is actually
> accessable.
>
> Thanks,
>
> Andy
>
> ----- Original Message ----- 
> From: "Peter Golledge" <petergolledge at gmail.com>
> To: "'Andy Schor'" <walbum1 at verizon.net>; "'Airbil'" <airbil at gmail.com>;
> <s-car-list at audifans.com>
> Sent: Sunday, August 15, 2010 5:07 PM
> Subject: RE: [s-cars] Project S6 on the road again in Pittsburgh
>
>
>> Andy,
>>
>> The main fan clutch has a fluid which thickens with an increase in
>> temperature (dilatantic if I remember my chemistry of old). Best to test
>> once you've been for a drive in some heat and with a relatively high air
>> temp.  These clutches are a relatively common failure item once you get
>> 150K
>> miles+.  There is not a massive amount of resistance on the clutch though
>> as
>> this fan is drive off the "back" side of the serpentine and doesn't push 
>> a
>> huge amount of air.  Relatively easy to replace at least!
>>
>> -----Original Message-----
>> From: s-car-list-bounces at audifans.com
>> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Andy Schor
>> Sent: Sunday, August 15, 2010 11:33 AM
>> To: Airbil; s-car-list at audifans.com
>> Subject: Re: [s-cars] Project S6 on the road again in Pittsburgh
>>
>> Absolutely correct Bill.  The supplemental fan (A/C) works but I can hold
>> the main fan still without much resistance.  I also just noticed that 
>> even
>> though I turned off the HVAC fby  pressing fan speed (-) until the head
>> shuts off, the next time I start the car, the HVAC is on.  Is that 
>> normal?
>> This is my first C4, I've been driving type 44s for years.  Which brings
>> me
>> to my next observation, the power steering is *much* more assisted in the
>> S6
>>
>> than the 200.  Is that the servotronic?  Just something else to get used
>> to,
>>
>> I suppose.
>>
>> Lessons learned indeed, thanks for the benefit of your experience.
>>
>> Andy
>>
>> ----- Original Message ----- 
>> From: "Airbil" <airbil at gmail.com>
>> To: <s-car-list at audifans.com>
>> Cc: <walbum1 at verizon.net>
>> Sent: Saturday, August 14, 2010 5:17 PM
>> Subject: [s-cars] Project S6 on the road again in Pittsburgh
>>
>>
>>> Andy,
>>> You probably need to replace the fan clutch and electric fan and 
>>> possibly
>>> the blown, mother of all fuses, fuse for the electric fan, drivers side
>>> left kick panel.
>>> Good luck, stay cool.
>>> Bill~w/lessons learned~m
>>>
>>>
>>>                             ~ via airmobil 2 ~
>>
>>
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>
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