Note On INTERMITTENTS

If Codes B446 and B447 are both set, check low side temperature sensor and circuitry. If okay, evacuate and recharge system. If Codes B447 and/or B448 are set, check low refrigerant pressure switch and circuit.

Fig 1: Codes B446, 447, 448, Schematic, Refrigerant Sys Problem

Courtesy of GENERAL MOTORS CORP.

Fig 2: Codes B446, 447, 448, Refrigerant Sys Problem (1 of 2) Flow Chart

Fig 3: Codes B446, 447, 448, Refrigerant Sys Problem (2 of 2) Flow Chart