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1992 Legend heater stopped blowing

My 1992 Acura Legend blower motor stopped blowing. How do I tell if its the blower motor or blower motor relay or something else? Thanks in advance.

Probably the blower motor. If the blower motor relay failed you would have either all low speeds but no high speed, or no low speeds and just the high speed. Try tapping on the blower motor with a handle of a screwdriver with the setting on high speed. If the blower motor operates when doing this, replace the blower motor.

Tester