B449

Code B449 is designed to disengage the A/C Compressor Clutch in the event that high side refrigerant temperature exceeds 9°C (19°F). The A/C Compressor will come back on once the HI side temperature falls below 93°C.
^ Key "ON" engine running with A/C on.
^ Select BCM Data BD27 A/C HIGH side temperature (°C).
^ Note temperature displayed during A/C operation.

If the code was stored or current temperature exceeds 93°C, possible causes for excessive high A/C head pressure must be checked. for a Refrigerant System Performance Test See "Electronic Climate Control." Heating and Air Conditioning