I have an 08 +4 Duratec, I had a 4 seat version of the same car before that and both run around an indicated 80 degrees (I say that as I don't trust the gauges but the engine feels normal to the touch, and yes I have touched a few ;-)). Last week I had a lift in another TM members 07 +4 and noted his temperature was exactly the same as mine, different gauges but the same indicated temperature so I think the Duratec runs a tad cooler that in its OE Ford installation. I would suspect a sticky thermostat, the fan is ECU controlled, the signal comes from an engine temperature sensor so always a chance the sensor is a tad sensitive but the thermostat is a good starting place. Testing one is simple if you have a thermometer. Remove it and before placing in a pan of water with the thermometer push open the bellows carefully with a thumb, insert the end of a length of cotton and start heating the water on the hob. Observe the thermometer and suspending the thermostat in the water it should drop off the cotton at the temperature indicated and normally stamped on the bottom. Continue to heat the water and at 100 degrees the bellows must be fully open. The temperature stamped is the 'crack open' temperature and it's difficult to spot as the initial opening is just a few throu. Hope that helps, please let us know what you find as its all a learning curve ;-).
Last edited by Spanner Juggler; 10/03/15 08:32 PM.
