1998 Chevy Venture Fluctuating Temp Gauge

1998 CHEVROLET VENTURE
110,000 MILES • 6 CYL • FWD • AUTOMATIC
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During normal driving the temp gauge is going from the normal range to the hot range and back again. It has reached all the way across at times, but goes back down again. I have replaced the thermostat, the drive belt, and flushed/refilled the system. It is one of the wierdest things I have ever seen a vehicle do. I've never had a vehicle over heat then suddenly cool down only to have the gauge start upward again (and just that quick too)! Any help you can give me with perplexing problem would be greatly appreciated.
Oct 7, 2008 at 3:01 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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