Refrigerant capacity of a prostar

[Waterloo]

(05-02-2016 )Rawze Wrote:  

(05-02-2016 )Nilao Wrote:  It quit squealing, and cooling lol...I backed it out..it's now out so far there are 2 threads showing...I'm sure it's toast.

if I remember right, about 3 threads showing on that brass cap, -- and the whole valve will blow up in your face dangerously, spewing refrigerant and valve guts at high velocity all over you in one big mega-blast!!!--- Do NO SAY you weeren't warned!@!! Turning that brass piece is extremely dangerous if there is pressure in the system!> It can have more than than 350 PSI on its face on a hot summer day and that needle valve in it can shoot out like a bullet, right into your eyes!.!.

THAT BRASS CAP IS IT IS ACTUALLY NOT SUPPOSED TO BE USED AS AN ADJUSTMENT SCREW!

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I did this before out of my own sheer stupidity!@ -- And I found the cap about 40 feet away. Luckily, I was not standing in the way, but I did get my face soaked and covered in green refrigerant snot really badly.

My AC system was squealing too, sounded like a French Horn under my hood. Is there a REAL fix for this Rawze other than turning that brass screw? I have been through this to many times to count. What causes this high pressure in the expansion valve?