Hi all
I've had my 2010 Bravo 1.6D auto for around 2 months now, its developed a fault that 2 mechanics have looked at but don't know what the issue is?

the temp gauge on the dash shows cold all the time, no heat coming through the heating, and occasionally the engine management light comes on, apparently the thermostat is working OK, the economy has dropped of a little which makes me think its the temp sensor, any advice gratefully received, i'm in Windsor if anyone can recommend anyone reliable?