BCM Code B449, A/C-Heater High Side Temperature Too High

Code B449 is designed to disengage A/C compressor clutch in event high side refrigerant temperature exceeds 199°F (93°C). The A/C compressor will come back on when high side temperature falls to less than 199°F (93°C).

With engine running and A/C on, enter BCM Code BD27. Record temperature displayed during A/C operation.

If Code B449 was stored or current temperature exceeds 199°F (93°C) and A/C pressure exceeds 380 psi (27 kg/cm² ), possible causes excessive high A/C head pressure must be checked.