553/554 - Air-Con Coolant Pressure Fault ~~~~~ 553/554 - Air-Con Coolant Pressure Fault. To check all car A/C fault and rectify.  553/554 Checked/found #1553 and #3554 unit 2-1 having aircon coolantfault. Discharged freon & vacuum. Pressure able to hold after monitoring. Charged freon LP=40, HP=110 & monitor for 2 hrs - OK.  Wong/Farid/Haiqal/Koon PL 45475