stusfesta: I'd get yourself a new thermostat first off, notoriously shit on all CVH engines (fairplay they did make a pigs ear of designing CVH didn't they )

My one came from halfords, cost about £4, and my car runs amazingly cool, heaters are roasting, drive along at 10 miles per hour and the temp needle sits right down, obviously in traffic it does get hot and the fan cuts in, but it is excellent IMO, warms up quickly too (again notoriously crap for warm up times)

If your fan isn't cutting in even when its left at stand still its going to be the thermostat. If you turn the heaters on when its stationary i bet the heaters go cold in a matter of seconds yeah? And no heat when driving?