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A car is never warmed up after 2 minutes unless it's hot outside, a block heater will warm it to operating temp before you even put the key in the ignition.
In the winter, most vehicles take a few miles to warm up. some take as little as one, but mine takes 5 miles. For your engine to be warm, your temp gauge is usually about 2/3-1/2, or if you don't have a temp gauge, you can easily judge this if the vehicle's heater is putting out hot air. if it's just warm air (compared to what it normally is) then it's not warmed up. if it's cold freezing air and your heater actually works, then your engine is cold soak. your engine may be warm enough to drive without your engine acting up after 2 minutes, but a block heater will definitely help on a winter morning. not only will your engine run smoother, and you will get better mpg's than when it's been cold soaked, but you will have hot air coming from the heater as well.
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