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There are a few possible reasons why the heater isn't working in your Hyundai i10. One likely cause could be a malfunctioning blend door actuator located in the dash, which regulates the airflow through the vents. If this actuator is faulty, it may hinder the proper distribution of air. Another common issue may stem from a defective temperature control switch that operates an electric motor to control the flow of hot air or the activation of the AC system. Finally, a potential culprit could be a blocked or damaged heater core situated behind the passenger side of the dashboard. Repairing this last issue could cost you more than $1000.
The Hyundai i10 heater could fail to function properly due to a malfunctioning heater blower motor or issues with the thermostat.