[V8] Heat Soaking V8

[d saad]

I think your theory is correct. I guess my point is just that the engine
driven fan is so much more powerful that I would focus on it for rapid
cooling.

But - if it works - then it works...


Dave

> In re the AC question, my theory is that the system
only adds heat
> when it's trying to cool.  If you set the CC temp
to ambient, or when
> the interior fan is barely running, I don't
think the system is really
> trying to do much.  You can take this
a step further by actually
> making it pump some heat out... in
A/C mode, those electric fans will
> still be running and you'll
be taking heat out of the engine in
> another manner as well.
> 
> Ed
> 
> On 4/18/07, d saad
<dsaad at icehouse.net> wrote:
>>
>>
>> I am going to guess that you have a clogged radiator or bad
t-stat. You
>> should not be running that hot this time of
year.
>> As for the
>> expanding pressure, all cars
heat up after you shut them down. There is
>> a
>>
lot of latent heat that the cooling system is no longer carrying off.
>> The
>> coolant tank is designed to account for this
expansion (so do not over
>> fill it!). If it does over
pressure, the (pressure) cap will let the
>> excess out - it
just spills out on top of the coolant tank.
>>
>>
To
>> cool a really hot engine before shutdown, I would turn
off all excess
>> loads - including the AC (not saying your
method does not work Ed - but
>> the AC adds a heat load to the
radiator) and run the motor at about 1500
>> RPM for a few
minutes. Just fast enough to really get the engine driven
>>
fan moving some air but if your radiator is bad, you may not accomplish
>> much cooling.
>>
>> Dave
>>
>> > 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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