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Q:

Put a new battery in. Now will nott idol unless the airconditioner in on high on 2008 Mitsubishi Endeavor

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When the air is off the car dies
(2) Answers
The computer needs to relearn the idle speed. Take the car on a long drive with the A/C off. Lots of 40MPH plus. It will relearn after 10-15 miles.
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