Does my newly-rebuilt 1999 Ford Focus have a thermostat fault?

I have recently rebuilt a 1999 Ford Focus 1.6 SE silver top engine, which runs very nicely. When the thermostat opens, the bottom hose gets nice and hot, but after a higher speed run the hose goes very...

Why is our Peugeot 406 overheating?

We have a 1999 Peugeot 406 that seems to get hot very quickly, going from 70 to 90 to 100 on the temperature dial. Also the engine, when hot, runs erratically. Can you help?

Cold medal

I have a 2003 BMW E39 525dSE auto Touring that appears to have a problem of overcooling. It can take up to 10 miles to reach normal working temperature, summer or winter. At that point, descending hills...