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To repair an electrical problem in the heater blend door motor control circuit on a 2003 Mercury Sable, first, inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Use a multimeter to check for continuity and voltage at the blend door motor while the vehicle is running and the climate control system is activated. If the motor is not receiving power, trace the circuit back to the control module, checking for faults in the wiring and connections. If the motor is faulty, it may need to be replaced to restore proper function.

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2mo ago

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