It means that the coolant level in the expansion has gone low...or what happens in all of these cars eventually, that you need to replace the level switch. It's like $15 new.
You add coolant to the expansion tank. That is all. So you open the hood and then you open the expansion tank and add coolant. If it is full then you buy either a new one from the dealer or you can buy one from me for 10 shipped.
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