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Yes. The coolant temp sensor tells the ecm what the engines operating temperature is so that it can run with optimal efficiency. When the ecm does not know the engine temperature, it assumes the worst (that it is over heating) and disables the ac to reduce load on the engine. It will also kick the fans to the high setting. Replace the sensor and the ac should start working again.

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Q: Is there a correlation between your ac not working and the coolant reading not there on dash display?
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