Fluid low warning light still on after filling fluids

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If you've topped off all the fluids and that pesky low fluid light still comes on, your 1999 Saturn SL1 might be dealing with a faulty coolant level sensor—they're known to stick or fail, especially with age. It's located in the side of the coolant reservoir, and if it's gummed up or shorted, it'll keep triggering the warning even if the tank is full. Now, the disappearing coolant is a separate concern. If there’s no visible leak, it could be evaporating through a small crack in the reservoir, leaking internally through a bad head gasket, or even sneaking out through the heater core. Check for white smoke at startup, sweet smells inside the cabin, or coolant residue around the reservoir and hoses. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.