Allright Outdare,
I would start by running through the various functions of the ac system while it is running. Hopefully as you cycle from max hot to max cold or change vent distribution you will hear the click go away. It sounds like a blend or mode door actuator is trying to find it's commanded position but can't because some teeth or broken off inside of it. If you get under the dash and put your hand on the different little black boxes(roughly the size of a pack of cigarettes) you should be able to feel the defective clicking actuator.
You could probably also perform a draw test with a test light if you have one handy. That would require removing the negative battery terminal and using the test light to bridge the terminal to the battery post. A test light brightly illuminated indicates your draw. As you pull fuses from the box(I'd start with the ac ones) you should see the light dim noticeably or go completely out. At least then you will know what system is drawing power.
The airbag light is a whole different animal and will require a code to start to diag.
I would start by running through the various functions of the ac system while it is running. Hopefully as you cycle from max hot to max cold or change vent distribution you will hear the click go away. It sounds like a blend or mode door actuator is trying to find it's commanded position but can't because some teeth or broken off inside of it. If you get under the dash and put your hand on the different little black boxes(roughly the size of a pack of cigarettes) you should be able to feel the defective clicking actuator.
You could probably also perform a draw test with a test light if you have one handy. That would require removing the negative battery terminal and using the test light to bridge the terminal to the battery post. A test light brightly illuminated indicates your draw. As you pull fuses from the box(I'd start with the ac ones) you should see the light dim noticeably or go completely out. At least then you will know what system is drawing power.
The airbag light is a whole different animal and will require a code to start to diag.