[V8] Heat Soaking V8

[Ed Kellock]

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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