2007 Tahoe losing coolant ???

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porsche930

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After noticing the coolant gauge needle going back and forth, I saw that the reservoir needed to be filled. A few days later, it was down again, so I filled it up. It's been going down each day, needing a refill, BUT -- there is no puddle to be found; no white exhaust; none in the oil (I change that myself); and no other leaks to be found. So, where is it going? Thanks.
 
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