04.5 duramax temp maxed out startup

jlwoods99

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May 10, 2012
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midland, mi
Something failed with my Coolant temp Gauge. At cold startup it shows 260°. Then goes to about 300 if I had to guess. It didn't limp or no engine lights came on to make me think the computer so a high temp. Anyone with any thoughts would be helpful.
 

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