I think if you read the section in the WSM it lists a whole bunch of things that can cause those codes to appear.
Was it in direct sunlight? Was half in sunlight? was one covered? Was it in the dark? Was it raining? Was it a day with a Y in it?
I don't think it makes a lot of difference, I think the intention for them was to be able to say 'ahh drivers side is towards the sun, I'll bump the cooling up a bit more for them, i.e. they want 22, I'll aim for 21 to account for him being sunburnt'.
I think I detect an ever so slight difference when I remember to move the two hats on the dash over the binnacle which covers one side.


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