The blue temperature light is the "Low Engine Coolant Temperature" warning light. This light sets when the engine coolant is not at the temperature that the on-board computer is expecting to see after a certain amount of time the engine has been running. There are a few different things that can cause this issue.. Blue Coolant Temp Light On: Engine coolant is cold and no warm air is available for heater/defroster.. Mazda gives us a blue light when below "normal" and a red light when above. Just like airplanes I work on, the pilot gets only enough information he needs to complete his flight safely. black panel is a good thing. vast majority of the.
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Low Engine Coolant Temperature Indicator Light (Blue) The light illuminates continuously when the engine coolant temperature is low and turns off after the engine is warm. If the low engine coolant temperature indicator light remains illuminated after the engine has been sufficiently warmed up, the temperature sensor could have a malfunction.. Ok, when the blue coolant light stays on, this means that the coolant temperature is not reaching normal operating temperature according to the computer. This is either a faulty reading from the engine coolant temperature sensor or the thermostat is sticking open causing the coolant to continuously flow and never get to proper temperature.