[DML] Re: AC system compressor doesn't cycle, high discharge pressure
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[DML] Re: AC system compressor doesn't cycle, high discharge pressure



The low side pressures will go high if there is not enough heat
transfer. Basically the liquid is not evaporating enough so the low
side is getting flooded with liquid and when it does turn to gas it
increases the low side pressures. This can be caused by not enough air
flow over the evap coil, a dirty coil, or a "flooded" coil, meaning
there is too much refrigerent. You could also have a low presure
switch way out of adjustment. The compressor MUST cycle. Try adjusting
it. It is the screw in between the electrical contacts under the plug.
This is how the evap coil is defrosted. If the evap coil freezes up
the low side pressures will shoot up and you won't get airflow. This
can also be from a defective orifice tube. If it lets too much
refrigerent through then the evap coil gets "flooded". Wtih all the
things you have done so far I cannot tell you exactly what to do.
Start by making sure you have enough airflow over the evap coil. YOu
have to get the low side pressures correct. If the high side is too
high then you have air in the system or the condensor coil is not
transfering enough heat. Again either not enough air flow or a dirty
coil. I have seen A/C coils that looked clean but when I washed them
with chemicals and "brightened" them it made a big difference.
Especially aluminum coils. 
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "Marty Galbreath" <marty@xxxx> wrote:
> I am having a terrible problem with my AC system on the Delorean. 
> Maybe someone can point me in the right direction.
> 
> The beginning?after I had my car restoration complete, I checked
> the Freon charge and saw it was empty. I evacuated the system and 
> charged with 36 ounces of R12. I had replaced the low pressure 
> switch since it was old and rusty, but nothing else was done to the 
> system.
>






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