+1Small aluminum engines take a long time to warm up in the cold. Always have. Cover the front up and it makes a huge difference. Winter fronts for trucks were common. Not so much anymore just because people are stupid and lazy. I still use one on my 2010 Silverado.
Or just drive it harder to generate more heat.
Pussyfooting the throttle isn't going to get you the heat you want.
These alum engines all have problems generating heat, until you drive it, like it was designed to be.
This isn't a Kia issue. Plenty of other vehicles have the same issue including VW.