Analyze Possible Causes
Check the thermostat setting, coolant level, heater core, and air blend door.
Check Thermostat Setting
Ensure the thermostat is set to a temperature that should provide warm air.
Inspect Coolant Level
Low coolant levels can prevent the heater core from warming up the air.
Examine Heater Core
A clogged or malfunctioning heater core can hinder heat transfer.
Assess Air Blend Door
If the air blend door is stuck or malfunctioning, it may prevent warm air circulation.
Conclusion
By thoroughly checking the thermostat setting, coolant level, heater core, and air blend door, you can identify and resolve the issue of your car AC not heating.