Hello,
Many times the heater will not work as the coolant will not pass thru the heater core, due to
a faulty heater valve. That heater valve is a fairly common issues with these vehicles.
That valve tends to fail and gets stuck closed and prevents coolant from flowing to the heater core.
Replacing the valve should fix the issue.
You also want to make sure that there is no clog in the hose that attached to the valve in case that is restricting the flow of coolant.
https://www.2carpros.com/articles/car-heater-not-working
https://www.2carpros.com/articles/how-a-car-heater-works
I have attached diagrams for your reference.
Please let me know of any questions.
Thank you.
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Thursday, September 9th, 2021 AT 11:30 AM