As soon as battery is connected, the cooling fan turns on. It will stay on.

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your Eos is a bit overzealous in its cooling efforts. When the cooling fan kicks on as soon as you connect the battery and refuses to quit, it's usually a sign that something's gone awry with the fan control module or a relay. The fan’s getting power constantly, likely because the control system is stuck in the "on" position. You’ll want to have that module or relay checked out. Otherwise, it's like your fan's decided to run a marathon when all you needed was a sprint. If you need any further advice or if you'd like any help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!