Ford Mystique Owner's Manual page 23

Instrumentation
Low Coolant Light (If equipped)
This light indicates that the level of the engine coolant is low
inside the coolant recovery bottle and that you should add more
coolant. See Engine Coolant in the Index.
This light comes on for a few seconds when the ignition is
turned to the START position, but should turn off when the
engine starts. If this light stays on, check the level of coolant
inside the recovery bottle. The level may be slightly above the
MIN line because the light is an "early warning."
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