Ac system won’t equalize pressure.

[workinonit]

I'm going out on a limb and say that it sounds like the OP is not AC savvy. It may be time to have someone look at it for you and at least verify things are put together as they should be.

 

[Stewartkyle44]

I agree it kinda seems like something is backwards with how different the low and high side pressures are but there is really know way to hook up anything backwards besides the wiring. The expansion valve has an arrow on it for direction of flow and each side of fitting is two different sizes. The high and low side lines feeding the pump are different sizes and can only be mounted one way. The dryer can only be mounted one way as well.

 

[LittleBill21]

I agree it kinda seems like something is backwards with how different the low and high side pressures are but there is really know way to hook up anything backwards besides the wiring. The expansion valve has an arrow on it for direction of flow and each side of fitting is two different sizes. The high and low side lines feeding the pump are different sizes and can only be mounted one way. The dryer can only be mounted one way as well.

you were blowing pressure valves prior, I don't believe you did it wrong at all, you have a major obstruction somewhere.

 

[Harry in Ky]

I can't help leaning towards inaccurate readings. Manifold issue, gauges, hoses, couplers, schrader valves, etc. Most of the time when I find weird stuff like that it's because I'm not properly connected into the system on both sides even though I THINK I am.

 

[Stewartkyle44]

@LittleBill21 I think you are right. The core must have an obstruction or somewhere in the AC unit itself

 

[Stewartkyle44]

@Harry in Ky That is a good thought as well but I have evacuated and charged the system before (last year) when I had to pull the cab to do a mechanical repair and had to disconnect the lines. Did everything that I am doing now but it took Freon and worked fine all last year. Come this year after winter the pressure relief valve just started randomly blowing off which led me to where I am at now.

 

[Harry in Ky]

Do the lines have quick connects somewhere? If so have they been messed with lately? I can imagine a problem there could have a bearing on this. You flushed the system (in both directions?) and had no problems with flow though anything in either direction, right?

 

[Stewartkyle44]

So there is a way to hook up the low side and high side to the back of the compressor backwards and that’s exactly what it was. I feel like an idiot but I guess you live and learn. Thank you everyone for all your good input!!