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  1. 6.4 Motor Problems
    Good Sirs, need some help. '08 F450, 6.4 with 138k. Bought truck in July and had no problems until December. Check engine light came on, had codes read by dealer resulting in P0128 Coolant Thermostat Malfunction. Symptoms matched code, no heat indicated on gauge and no heat from heater. Bought...
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