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mmamdouh, thanx for your help.
With either of your two explantions would it be ok to carry on driving and ignore the gauge or could i be causing more problems?

Dave.

Recently my temp gauge has been fluctuating rapidly between mid temp to beyond the Red Hot mark. The radiator is full and dosnt seem to be overheating when ive stopped and checked.
Could i just have a faulty gauge?
Any thoughts appreciated.

Dave.