Sometimes the coolant level sensor will crap out and send signals, but in your case, you probably just need to put more coolant in.
The sensor hangs from the top of the coolant overflow tank, and when the fluid level drops and the coolant dries off of the sensor, the "check coolant" light comes on. When your car is cold and there your coolant level is a little low, the sensor will dry and turn on the light. When you drive, the coolant level in the overflow rises as the fluid expands and wets the sensor, and it turns off. Does this to me all the time.
--nathan
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'91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back.
Daily Car: '04 Infiniti G35 Sedan 6MT
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