Well either the clutch or the compressor. I say this because the noise is not there with the A/C turned off.
I haven't been able take that trip yet
I want to replace the service port caps first and I left my lights on my other car... Waiting for the battery charger to do its job.
Sorry, I didn’t reply to the bulk of your questions. I appreciate your thoroughness reading through the post you obviously are an authority on the subject. I will take new readings and answerer your questions once I get back from NAPA.