Code B450 - Coolant High Temperature (A/C)

If code EO14 is also stored, repair code EO14 first. Code B450 is designed to disengage A/C compressor clutch if engine coolant temperature exceeds 261°F (126°C), and re-engage when temperature falls below 248°F (120°C). With engine running enter BCM data code BD21. Display will be in degrees Celsius. Record coolant temperature.

Engine overheating may accompany this code. If coolant temperature exceeds normal operating range, check for sources of overheating. If coolant temperature displayed exceeds actual coolant temperature as measured with a radiator coolant temperature tester, sensor may be faulty.