Pax feedback to staff(YCK) car 3630 waswarm. TC confirmed no air-con fault. Staff(BDL) checked and confirmed no abnormalities. Car was cooling. Pax feedback tostaff(YCK) car 3630 was warm. TC confirmed no air-con fault  ~~~~~ Pax feedback to staff(YCK) car 3630 was warm. TC confirmed no air-con fault. Staff(BDL) checked and confirmed no abnormalities. Car was cooling. CE:1630, 2630 coolant fault  Checked 3630 no aircon fault, no fault indicated on TIMS. Car was cooling and aircon were able to cut in and out. Checked 1630 and 2630. TIMS indicated coolant pressure fault. Found both cars had low freon levels. charge freon. Checked and found no freon leakage. Aircons were able to cut in and out and cars were cooling. Further checked and found 2630 AC 1-2 CCU motor no compression. Notification to HM for CCU change out: 2581367 Done by: Sateesh/Gopal/Jack 19.3.24