Hi went for a ride (8 miles) out in country, but when came back into city, radiator fan came on fairly soon after sitting in traffic. The traffic was very light though but after another 2 miles fan was still on when I got back home? I also find that travelling 3 miles into work in light traffic and the fan comes on when I get to work. No leaks at all - Coolant level is on upper line in reservoir, is this normal? I was thinking perhaps a faulty temperature sensor? Thanks for any help on this.