Q: Heat Gauge and Air Conditioning

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I have noticed when I run my A/C that my heat gauge will rise just a tiny bit. It doesn't get to 225 but does rise a very small amount when I am going uphill or stop at a light. It does go back down when I'm driving normally and even when it is reading above normal the coolant level remains the same in the reserve tank. Is this normal?

My car has 215000 miles.
My car has an automatic transmission.

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