Find out if it's the sensor or the gauge by exchanging gauge clusters with a friend, or getting a scan tool that can observe the raw coolant temp data. If it's the sensor, check the wiring, then replace it. If it's the gauge, search for "stepper motor" and if you can solder, replace that. If you can't solder, pay an Ebay instrument repair vendor to fix your cluster. If you can't find a friend or a good scan tool, open your wallet and pay a mechanic, or open three wallets and visit the dealer. :no:
In almost all cases, you can buy a scan tool for less than a dealer visit. Check out: http://www.obdcom.com/software-obd.htm if you already have a laptop.:m2:
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