A/C not working

Welcome to 2CarPros.

The first thing I suggest is to disconnect the connector to the compressor and see if the fuse still blows. If it does, there is a problem with the electric clutch. If it doesn't then you need to trace wiring to find where the short is located. Keep in mind, the AC switch itself can be bad too.

I have attached a few pictures of the wiring schematic for you.

Picture 1 shows the power wire at the compressor electromagnetic clutch. It is a black wire with a white tracer. Disconnect that and see if the fuse blows. If it does, take a look at the rest of the pictures. Power runs from the switch via a white wire with a black tracer. It connects the with the switch, ground, and AC amplifier on the right side of the instrument panel. You will need to follow that wire to see if there is a bare wire, or something causing it to short.

Here are a few links that you may find helpful when checking wiring:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find or if you have other questions.

Take care,
Joe

Happy to help. Let me know the results and have a safe trip.

Joe

Welcome back:

Something is shorted in the compressor clutch on your original compressor. The compressor you got from the junkyard, is it good? Did the clutch engage? I see you ran power to it from the battery. Did you hear the compressor clutch click indicating it was turning the compressor? Is the used compressor fully installed including Freon?

Let me know,
Joe

Welcome to 2CarPros.

If you ran power directly to it, the clutch should have engaged regardless of Freon. Honestly, it sounds like the clutch is bad.

Let me know what you find.

Joe