<VV> Heater Assisted Cooling

[Joe West]

Hi Smitty,

I would have to disagree with your analysis of the situation when "Heat" is
selected.
Assuming that the heater fan is operating at the same time the Heat setting
is selected, the heater fan will actually be creating a negative pressure at
the back of the manifolds.  This negative pressure will actually increase
airflow across the cylinders (the air the fan is pulling has to come from
somewhere).  This will indeed decrease the operating temperature of the
engine.

As an aside...another case where turning on the heater fan and blower is
when you have overheated your engine and you are stopped.  Turning on the
heat and blower will help cool down an overheated motor more quickly than
you might expect.  I recently got to practice this method after my son's
Corsa threw a fanbelt just before he got home.

Joe West


On 8/22/05 7:28 PM, "vairologist at juno.com" <vairologist at juno.com> wrote:

> 
> 
>> From: "Doug Foust" <doufou at msn.com>
>> Subject: <VV> Running Heater to add cooling
> ....> 
>> I have been running my EM vert with the Air and Heat wide open
>> lately 
> ---------------------------------
>  Smitty says;  Methinks you do not understand the air routing of a
> Corvair heater.  Any time you have "Air" selected you are drawing air
> from off the top of the engine before it passes through the engine.  In
> other words it can not be utilized to cool the engine.  Then too when you
> have "Heat" selected you are merely drawing hot air from the front of the
> manifolds rather than allowing it to exit at the back of the manifolds as
> it normally would.  So no profit there either.  Save yourself the heat
> stress and leave the heater system  closed up in hot weather.
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