3621 - A/C 1-1 COOLANT PRESSURE FAULT. F ~~~~~ 3621 - A/C 1-1 COOLANT PRESSURE FAULT. FC 518 (HLPS 1 OPS)  3621 A/c 1-1 FC 518 (AC 1 HLPS 1) Checked and found freon pressure low. Purge and vacuum freon, able to hold -30psi. No signs of freon leaking. Charge freon, LP/HP : 40/110psi.    AC able to cut in/out. Monitored for 2hrs. No fault reoccurred.  Lee KH/Wong/Aqil/Shamil 45389