Tourneo Courier 1.0 EcoBoost: Temperature / cooling water only lukewarm / your experiences?

Good morning together, just before Christmas I have to open a thread myself again and hope for your experience and the „Schwarm Intelligence”… thank you in advance for your time and help! So, Ford Tourneo Courier, EZ 01.2018, EcoBoost, 101 hp, switch (still the 5th course). The car (my wife) is and is very well maintained, has now 62,000 km on it, the engine is always warm with feeling and all 10 TKM gets fresh oil. And also the right oil for the run in the oil bath the timing belt. The EcoBoost problem should be known to everyone. Car and engine so far without problems, are very satisfied.But: In winter at outside temperatures below 5 degrees, the car becomes difficult to warm. Since it has NO lockable lamellas in front of the cooler in contrast to the successor model from 2019 (Opa) the cold air flows into the engine compartment unhindered in winter… and it takes forever, until there times with the small three cylinder by 45 or 50 degrees cooling wax In the board menu you can display that, and over 50 degrees the car doesn’t come… despite long driving distances on highway and highway at 120 km/h. That can’t be normal, right? Has it been working since the beginning, in winter I always lock the lower part of the cooler at the front, so that not so much cold air flows in, then it comes to 60/65 degrees. Do other Courier drivers have the similar problem? Or does your cooling water get warm quickly and goes up to 85/90 degrees? White someone exactly when the thermostat opens and switches from the small to the large circuit via the cooler at the front. Can this be defective, possibly from the beginning? Or do other Courier drivers have the similar problem? I have heard that the EcoBoost and also the new diesel fabricate so little waste heat that it takes just a long time for the engine/cooling water to come to temperature… and especially with the models still without slats at the front that probably takes a very long time… h be? Your experiences? Thank you and greetings, Merry Christmas, Manu