My 98 buick century limited has a overfull coolant expansion reservoir when it's cool but the radiator light is on and the radiator is low on fluid. I'll fill the radiator, light goes off, drive it a couple miles once or twice. The light comes back on and the radiator is low again. The reservoir is still full. why is the reservoir not refilling the radiator?

  • Welcome to Motor Vehicle Maintenance & Repair! I suspect you have a bad radiator cap. – Pᴀᴜʟsᴛᴇʀ2 Dec 30 '18 at 21:35

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