Hello,
This could be due to a clog in the heater core. If the coolant cannot pass thru the heater core then the air will not be hot. You simply check the hoses that goes to the heater core and see if they are hot or cold. If there is a restriction of flow the the hose will be cold.
https://www.2carpros.com/articles/car-heater-not-working
https://www.2carpros.com/articles/replace-heater-core
https://www.2carpros.com/articles/replace-heater-hoses
It can be the blend door actuator that controls the hot or cold. However this vehicle have 2 actuators, one for driver and other for the passenger side. If one if bad then the other will still function. As it is unlikely that both failed at the same time.
https://www.2carpros.com/articles/replace-blend-door-motor
I have attached diagrams for your reference.
Please let me know of any questions.
Thank you.
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Wednesday, September 22nd, 2021 AT 1:03 PM