1995 GMC C3500 idle temp

1995 GMC C3500
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BKLYNMYKE
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Engine Cooling problem
1995 GMC C3500 Automatic 60000 miles

when I'm in idle the temp gauge rises but then as soon as I start to drive the needle moves back to the middle. Why does this happen & how serious is it?
Mar 26, 2010 at 5:41 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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