1997 Chevy Cheyenne heat gage

1997 CHEVROLET CHEYENNE
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VOLTMAN25
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Electrical problem
1997 Chevy Cheyenne Engine Size unknown Two Wheel Drive Automatic 230000 miles
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the truck was runing for about 5 min. when i stared going up a long step hill and my heat gage went all the way up into the red and at the top i drove a bit and then it went down to 50. Why did my truck do this it was not overheating and the preformance of the truck was the same. thank you
Mar 1, 2008 at 8:01 PM
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