It's a good thing you guys don't drive TDIs. They absolutely will not warm up until you go for a jog down the highway. If you start it and let it idle to "warm it up" in the morning, you'll come back to a stone-cold car. They're just too efficient to make enough heat to increase the temperature of the engine and/or interior. At 0°F outside, it takes a TDI 30 minutes of idling to reach 60°C