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When the AC comes on it uses a compressor that is driven by the engines belt. This uses power from the engine, which means you have less power to turn the wheels and move the car. If you are going up a hill or on the freeway our anything else that uses a lot of power, you may be pressing on the gas harder to maintain speed. If you press on the gas the transmission may downshift to maintain speed. This is my guess on what's happening or you may just think it's downshifting because the compressor will make a clunk when it engages and you will feel a greater load on the engine.

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Q: Why does Honda Civic downshift when ac on?
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