Code B450, Coolant Temperature Too High
Code B450 is designed to disengage A/C compressor clutch if engine coolant temperature exceeds 261°F (126°C) and re-engage clutch when coolant temperature falls to less than 248°F (120°C). If Code EO14 is also stored, follow diagnosis for that code first. Engine overheating may accompany this code. If coolant temperature exceeds normal operating range, check for sources of overheating. Carefully check all sources of intermittent engine overheating, such as improper coolant fan operation, faulty belt or tension, low coolant level and restrictions or faulty hoses and/or routing.