Project Big Six-y: 1991 BMW 535i/5

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And the dashboard keeps yapping at me for "COOLANT LOW OWNER'S MANUAL" which I suppose I should investigate. Temps are fine though, even in stuck-in-66-traffic-where-it-takes-an-hour-to-go-a-mile last night. Stupid sensors everywhere.

Typically the coolant sensor going bad (if its not low on coolant).