To check the coolant levelTo check the coolant level  - Engine coolant - Maintenance - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

A transparent coolant reserve tank (A) is located in the engine compartment.

The coolant level in this tank should be kept between the “LOW” and “FULL” marks when measured while the engine is cold.

To add coolant

    See also:

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    The operation status of the Twin Clutch SST control mode is displayed. Refer to “Twin Clutch SST control mode”. ...

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    Sedan
    Place the grove of clip top as shown, then remove the cover. Remove the bulb from the socket by turning it anticlockwise while pressing it inward. ...