Heater not working
Heather works with coolant passing through radiator and heather core (inside car) and also a blow motor that will blow air through the heather core inside car. The blow motor is working but there is a lack of hot coolant/water in heather core, what can be caused by a bad thermostat that is stuck, not opening or you may have low coolant level or clogged system. Start checking coolant level, if it is good, than follow the other suggestions.
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