Why is the heater not working?

Hello,

Typically the heater won't blow hot, is the heater core is defective or clogged? Another possibility is if you have a stuck open thermostat the engine will not get hot enough to blow hot air when the heater is turned on.

Is the car reaching its operating temperature on the gauge?
Does your vehicle has a secondary climate control in the back?
If so does it blow hot air from the back?
If it is blowing hot air on the back but not the front then it is more than likely is the heater core. If the back vent does not blow hot air either, then it could be a stuck open thermostat.

https://www.2carpros.com/articles/how-an-engine-thermostat-works

Here is few helpful articles on a car heater:

https://www.2carpros.com/articles/how-a-car-heater-works
https://www.2carpros.com/articles/replace-heater-core
https://www.2carpros.com/articles/car-heater-not-working

The heater core is located on the passenger side under the dash.
I have attached the heater core replacement procedure for your vehicle.

Please let me know of any questions.

Thank you.