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Also from the Seattle area and had a similar experience with another car.
The high air temps and elevation can affect vehicle performance. I drove a Chevy Colorado from Seattle to almost Wyoming in a mountainous area up around 5,000'. The truck was really struggling as the temperature was right around 100 degrees. I mean, it didn't have a lot of power to begin with, but it was really breathing hard, almost to the point where I thought there was a problem. I could feel the A/C compressor kick on and off..When it was on, it felt like I was suddenly towing a boat. The road ended and the trail began. That's when I kicked off the A/C as it was time to crawl in 4-low up the mountain, to an elevation of right around 8,500'. Insane.
I've owned a number of GM cars and the compressors can make noise. also, a second cooling fan usually kicks on, adding more noise, and then I believe the condensors have the ability to make noise as well.
If you think it's a problem, run it on one of these warm-sunny post July-4th days here in Seattle and take a video of it if the problem replicates.
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