[V8] Heat Soaking V8

[Ed Kellock]

Just to be clear, I am referring to the CC blower fan, not the rad fan.

The rad fan has 3 speeds that depend upon coolant temp.  The lowest
speed is engaged automatically when the CC is put into any AC mode.

The CC blower fan should vary infinitely depending on interior
conditions and CC settings.  When it's barely blowing any air into the
cabin at all and the CC is set to AUTO, the CC system feels that it's
not currently needed to adjust the temp, i.e. it won't be trying to
cool and therefore should be adding little to no heat to the engine
radiator.

Ed

On 4/18/07, Korn, Bob <Bob.Korn at fike.com> wrote:
> Seeing Ed's comment about variable fan speed made me wonder if anyone
> has updated a 90 V8 climate control head unit and ecu with a later model
> year?
> Be nice to have the later style head unit in my 90 V8.
> Bob
> 90 V8 Pearl Gray Sports 17" S4 Wheels(45et w/25mm HR spacers) Koni
> Sports 177K
>
>
>
>
>
>
> -----Original Message-----
> From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf
> Of Ed Kellock
> Sent: Wednesday, April 18, 2007 11:13 AM
> To: Scott Simmons
> Cc: V8 Audi Fans
> Subject: Re: [V8] Heat Soaking V8
>
> I've always turned on the A/C to cool the engine some when I want
> because it runs the electric cooling fan.  If you are already running
> it, then set the temp up to where the auto fan speed will trail off to
> almost nothing to ensure that the system thinks there isn't much/any AC
> work to do.  The electric fan will still be running though.
>
> Ed
>
> On 4/18/07, Scott Simmons <indischrot at gmail.com> wrote:
> > Has anyone had any issue with shutting off a hot engine?  Say 100 or
> > slightly warmer?  I'm not sure how to cool it off before turning it
> > off, idling seems to raise temp more than anything.  Right now, if I
> > Turn it off at 100, it'll soak up to about 105 then cool down but it's
>
> > only been 70 out.  I'm worried about triple digits.
> >
> > I know some cars have the cooling fan hooked up to kick on (at least)
> > a low speed even with the ignition off to help cool off an over-hot
> car.
> >
> > How does the V8 deal with the expanding pressure?  There doesn't seem
> > to be a "bleed line" coming from the cap.  Is it pressure rated to
> > release pressure (at 16 lbs., e.g.), or if not, how does the system
> ease pressure?
> >
> > Thanks,
> > Scott S
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