This is something I've noticed since I got the car about 2 years ago but wasn't too worried. I just have to drive around to get the temp back down but when I'm sitting idling for a while the temperature gets very high and it seems to have to get to about 3/4 to the top of the gauge before the fan starts up. I only did this once as a test to see if the fan worked at all and went for a drive straight away to cool it down again. Makes me hesitant to take it very far though, just in case. Should I put a new thermostat in it or be looking at the electrical system to get the fan cutting in earlier?
The stars in the night sky are just gaps between all the gaffers tape which is holding the universe together.
Also, what condition is your coolant in? If it looks like anything other than a healthy green (or red, depending on which brand you're using) make sure your radiator isn't choked up as well. One of the functions of coolant is to inhibit corrosion. If it's not changed every 12-18 months, it "goes off" and no longer inhibits corrosion. Rust particles clog the cores of the radiator and it will snowball from there. No harm in checking the rest of the system while you change the thermostat.
Flush your radiator, check your thermostat and replace if need be. VNs always run hot it is a design fault. Change the electric so your fan runs all the time. you can do this by re-routing your relay so it starts up when u turn on the ignition and doesnt cut out. Terminal 30 on your eng fan relay should be orange and pink route it to fuse #23. 87 terminal orange and blue to eng fan positive. 85 terminal should lead to C1 of the ECM, try earthing this to the body instead. 86 terminal should be pink and white. it routes to fuse #8 blower switch which closes when ignition is turned on. NB: you should have 100% coolant in your cooling system.