Thread: checking coolant fluid levels
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  #15  
Old 11-18-2012, 01:20 PM
grgry grgry is offline
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The reason the light comes on when the engine is cold is that the coolant is at it's densest level (shrink) and as it heats up it expands in size. So if the level is at the limit of the sensor, it may be below when cold and rise above when hot....
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