A/C 101 revisited

[Bernie Benz]

> From: Kneale Brownson <kneale at coslink.net>
> 
> As Alan Cordeiro suggested when I posted about my A/C test gauge reading
> Zero pressure on the high side, I learned today I didn't have the hose
> connected tightly enough to the high pressure test valve.
If not careful, we can learn something new every day.
> 
> So, getting back to my original status, I have about 45 pounds pressure on
> both high and low sides of the system when it's cold and static.  When I
> run the engine with the CC head set to "auto" and the temp at "lo", the
> compressor clutch engages and disengages every few seconds and the pressure
> on the low side swings between about 10 and 30 pounds.  The high side
> swings from about 50 to about 75 pounds.
> 
> If I read the Bentley right, my low pressure switch is opening and closing
> at the proper pressure range, but the high pressure side is way low.    Can
> I add refrigerant through the high pressure side?
No, not easily.
>  The Bentley says
> refrigerant can be added to either, but I always understood it should be
> added through the low pressure valve.
Stop playing games and just add charge to the SOB!

Bernie