This could be a couple of things but most likely sounds like the blower motor process (resistor).
https://www.2carpros.com/articles/car-heater-not-working
The way to confirm this is check the power at the blower when it is not working. We can be pretty confident that it will be 0 volts.
Then we need to go to the processor and check each wire for voltage. I suspect we will have 12 volts coming in but nothing coming out which means it needs to be replaced.
https://www.2carpros.com/articles/how-to-check-wiring
Below is the wiring diagram and the process from the manual that will help with this if this proves out.
Let me know if you have questions. Thanks
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Wednesday, March 24th, 2021 AT 5:12 PM