Hi,
If the sound seems to come from under the dashboard, there is a chance it is low on engine coolant, and you are hearing the heater core fill with coolant.
What I suggest is to check the coolant level first. If it is full, let me know if this still happens if the AC is not being used.
I will watch for your reply. I attached the only picture I had of the coolant reservoir below. The pic shows the reservoir with a pressure tester attached to the top. Ignore the tester.
Let me know what you find.
Joe
See pic below.
Image (Click to make bigger)
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Sunday, May 1st, 2022 AT 9:03 PM