CE reported car 1637 A/C 1-2 coolant pre ~~~~~ 1637 - Evaporator choked. Request for C/O 1637 CE reported A/C 1-2 coolant pressure fault. temp at 25.2c.  1637 A/c 1-2 checked/found leak & freon low pressure dropped sharply. Vacuum & charged in freon to LP=40psi, HP=120psi. Same symptoms occurred. Suspect AHU choked. OPS 20 raised to replace AHU.  Wong/Anand/Kiran/Aqil/Shamil 44729