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Originally Posted by carson356
it is not the coolant temp idiot light, but rather the coolant level idiot light, as stated in the previous post it does build up crud and will illuminate faintly.
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The sensor located near the bottom of the coolant tank gets corrosion buildup on the terminals and prematurely sets off the idiot light. You can clean the probes as a temporary measure, but it will work for about a week or so before it starts acting up again.
Buy a new sensor (around $40 I think) and be done with it...15 minute job.