2015 Kia Sedona with 123k miles. My Ac stopped working a few days go. I have ac gauges and while the compressor is running I’m reading about 45psi on low side and 120psi on the high side while temperature is 76F. AC is on full blast with windows open during this test. The compressor only seems to run for a few seconds before disengaging. It then continues to engage and disengage. Sometimes the air blows cool but never cold. Most of the time it’s blowing warm. From what I can tell the high side is reading too low. What could cause this and what should I check? I replaced the compressor at 107k miles due to a bad  valve inside the compressor(this type of compressor does not use a clutch to engage) that was was preventing it from engaging, and at the time I did vacuum and recharge the system myself. That fixed the problem until this issue now. What could it be?