go to your coolant resevior and unplug the low coolant level
sensor. dollars to donuts coolant is seeping out through the
sensor causing the dim lamp.

a new sensor, oring, and possible connector should take care of it.

as for the coolant check the threads on that issue. i usually
replace green stuff with the same and use the amber OE
coolant if thats what was in before.

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fabulous!