Hi,
This is a tough one because the relays for the vehicle are in the under-hood fuse box. Often times a clicking behind the dash is the result of an HVAC door actuator. There are small gears in them that fail and can cause what you described.
If you take a look at pic 1 below, I indicated where the actuators are. If possible, locate them, and one at a time, place your hand on them to see if you feel the clicking.
As far as the stalling, that (at this point) sounds like a different issue. The first thing I would recommend is checking for engine vacuum leaks. A leak can cause a stalling issue when the engine reaches idle. (Slowing down).
Here is a link that explains how to check and repair leaks:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Let me know what you find or if you have other questions.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Thursday, February 3rd, 2022 AT 8:09 PM