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Antifreeze and Engine Coolant
Chevy Lumina
Oldsmobile Intrigue

What causes the add coolant light to stay on even when you've filled the coolant up in the coolant holder?

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Wiki User
September 13, 2011 10:24PM

Coolant sensor is shot. Replace with new one.

Answer

The reed switch may be stuck. My 98 Grand Am coolant tank ran dry last week when my lower intake manifold gasket started to leak. Fixed the leak and refilled the tank only to see the coolant light still on. Tapped the switch/sensor on the bottom OS the tank with a rubber mallet so the magnetic float could loosen up and float back up. Sure enough, turned on the ignition and light was out.