Hi, the thermostat on my Mondeo TDCi (2003) isn’t working normally. The gauge takes ages to get to the first white line and then moves just above or just below the line throughout my journey depending if I’m accelerating (above) or releasing off accelerator (below). I had a similar experience a couple of months ago but at that time it varied from the first white line to the middle (12 O’clock). The problem seemed to correct itself overnight but started up again last week. I’m used to seeing the gauge maintain mid point, 12 O’clock. Any advice would be appreciated, what could be the fault, should I get it in the garage.