Hi,
This vehicle's actuators are controlled by an engine vacuum. In most cases, there is a leak that causes failure to airflow direction.
I would recommend making that determination first because the defroster actuator (which is vacuum operated) requires the removal if the instrument panel carrier. (Not a fun job)
I need to know if the defroster is the only thing that is working or if it won't switch to defrost. Let me know. Also, with the engine running, see if you can hear an air leak/hissing sound from the dash area.
Also, I attached the directions for you below for both the carrier and the defroster mode actuator. I started with the carrier.
Let me know as much as you can.
Take care,
joe
See pics below.
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Wednesday, May 10th, 2023 AT 9:45 PM