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BCM/system check


IRON HORSE
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Code B448 is Low Refrigerant Pressure. There are four pages in the Service Manual Covering B446, B447, and B448. Low pressure is checked with a refrigeration gauge set. Pressure is around 70 PSI with engine off at room temperature. Under 45 PSI will set codes. Under 45 PSI means freon is low. Over 45 PSI with error code means a sensor or wiring problem.

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