Heater Core & A/C Evaporator

["content22207" <brobertson@xxxx>]

Will people fall out if David T and I agree on something?

The heater core ALWAYS has SOME water passing through it (do you
really think that little platic shut off valve can stop all 16 lbs)
because without radiant heat the evaporator will ice over like an old
freezer. Freon evaporates at 22 degrees, well below the freezing point
of moisture in the car interior. I once bypassed a leaking heater core
in one of my Lincolns -- every 15 minutes or so I had to turn off the
A/C and defrost the evaporator with air vented from the outside world.
You'll know when your evaporator has iced over when little or no air
comes out the vents no matter the fan speed.

Notice we're talking about moisture OUTSIDE the system. Moisture
INSIDE the system indicates it was not vacuumed before charging.
Frozen water inside the system will also stop it up, leading to an
excessive pressure differential that will trip the pressure switch.

Re: removing humidity -- haven't investigated my new D that far yet
(it's still plenty warm OUTSIDE the car), but my Lincolns engage the
compressor during defrost for that very reason (to dry the air). Ever
notice all the moisture that condenses in the evaporator box?

Now, back to electricity...

Bill Robertson
#5939

>--- In dmcnews@xxxx, "jtrealtywebspannet" <jtrealty@xxxx> wrote:
> I disagree with #3
> The reason why the heater core is always on except in Max is just for 
> that reason and for an added bonus the A/C removes some of the heat 
> from the engine cooling system. It also improves the system's ability 
> to quickly reduce the humidity inside the car.