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The transmission is programed to shift at slightly higher points when the A/C is on. The reason is that the A/C compressor takes a noticable bite out of available horspower. The higher the shift points, the higher in the HP range the engine gets, causing more "crisp" shifts.

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17y ago
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Q: Why would a 1996 Chevy Suburban rev higher or shift harder when the air conditioning is on?
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