Overheating at idle

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js100

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Joined
Dec 21, 2013
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Location
California
Hi everyone,
I have a 07 Tahoe ls. The other day I was at idle for a long time. (waiting in line at a fast food restaurant). The temperature gauge went from 210 to about 225. It hadn't gone any more than that. I checked the coolant and that was good. I'm not too sure what else it might be. Please help. Thanks.

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