Kempy

the engine is a 2.0 litre 16v on a 92 (J reg)

I have had a problem recently with the coolent temp guage reaching between 100-110 oC within around 20miles of leaving my home. My oil and water levels are right, the water is not milky either. Maybe it was my thermostat not working? has anyone else encountered this? I was showed by somebody it could be the electrical connection on the water tank. It may have been dirty? Also what is the average running temp of the coolent, this time of year? Cheers for any help Ryan 2.0 litre 16 v 1992