This sounds like you have low engine coolant or the temperature blend door actuator stopped working but to but sure this video and guide can help us fix it.
https://youtu.be/SNRb6pSwYuU
and if the temperature blend door needs replacement here is a guide that can help with diagrams below to show you on your car.
https://www.2carpros.com/articles/replace-blend-door-motor
This guide can help as well
https://www.2carpros.com/articles/car-heater-not-working
Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem. replace your actuators in the heater unit under the dash. picture below
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Monday, May 24th, 2021 AT 7:27 PM