Hi all, Now the proud owner of a Nanocom unit, and having cleared all my faults I left it in the car to "see" what happens when driving. I pulled my horse trailer (empty) down the Motorways from the north of England to Dover - then from Calais to my home town, near Dijon. 1300km in all. Ambient temps were 12-18 degC in the UK and 20-32deg C in France. I drove at more or less the same speed all the time...65mph - 100km/h ie 2500rpm. The coolant temp needle on the dashboard never buddged ---