1501 A/C 1-1( ac compressor fault), also ~~~~~ 1501 A/C 1-1(ac compressor fault), also 1-1 having coolant pressure fault. 2502 unit 2-1 haing A/C compressor n unit 2 coolant pressure fault.  1501 A/c 1-1 & 2502 A/c 2-1 found system pressure low. Both A/c Compressor operation - OK. 1501 A/c 1-1 Tightened suction connector. 2502 A/c 2-1 tightened discharge v/v & cap firmly. Both A/c units discharge/vacuum/charged 407C freon. Function check - OK. Both cars saloon temp. 24*C.  Chan SW 44572