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How can I fix a faulty heat gauge ?

I have a 2006 Opel corsa 1.4i Lite, the temperature gauge reaches maximum but the car does not overheat. I can still drive around but am worried if it really does overheat, I might not realise it. I have replaced the thermostat and overhauled the cyclinder head.
Daryn, February 2014
Could be a faulty temp. sender unit

cdc, February 2014
link Click here to see other fixes for Opel Corsa.