Are you sure the correct amount of freon was added?
How did it work before the line went bad?
If you jump the low pressure switch what happens?
I have a brand new robin air ac machine, and I put in exactly what the system calls for. I have no idea how it worked before, It came to my shop because of no cool air, I initially charged the system, found the leak, and reclaimed the freon, so I never had it working for me. I will try to jumper the switch and see what happens.
With the switch jumpered, it runs constantly, like it should, I must have a bad low pressure switch.
Sounds like the problem to me
I'll put one on and see what happens. thanks
Have a good one