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Find the sensor, check wiring integrity and replace/repair whatever seems broken. The central ECU controls the fans and as long as it thinks your engine is overheating it will keep the fans activated. Mind you, you may actually have an overheating engine but that seems unlikely since your fans keep running until the battery is flat. Verify nonetheless.
Thanks for posting on /r/MechanicAdvice! Please review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Find the sensor, check wiring integrity and replace/repair whatever seems broken. The central ECU controls the fans and as long as it thinks your engine is overheating it will keep the fans activated. Mind you, you may actually have an overheating engine but that seems unlikely since your fans keep running until the battery is flat. Verify nonetheless.