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Q:

fan does not run after replacing it on 2003 Toyota Echo

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heater motor blower stopped running on all speeds so I replaced it with a will fit replacement. the blower ran but the air flow was too little. I cut wires to reverse;blower would not run again.
(1) Answer
It may be the blower control system. Check that. You need to see if there's power and ground to the motor, if so and it doesn't run, it's failed.