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The little stream of coolant at the top of the tank is normal. Not sure how you think it would taint the test. And that is a lot more widely used and trusted test, vs your baggie test, that I've never seen before.
Hard to just say head gasket is ok, because the baggie test passed.
You can go into the hidden menu on the instrument cluster, and view your engine coolant temp, I thought. Same way you can go in and reset your service reminders.
If it's hot out and the ac is running, I'd imagine the fan would be spinning. Can you just pop the hood and look too see if it's turning?
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