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Apparently, turning on the air conditioning is triggering the computer to send a DTC (diagnostic trouble code) to the check engine light. It would be in your best interest to have the OBDII connector scanned and retrieve the trouble code(s) to find what is causing the check engine light to come on.

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Q: What would cause the check engine light on a 1999 Chevy Prism comes on only after turning on air condition?
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