warming up your car

Every year at this time, you'll probably hear someone weigh in on the topic of letting the car idle in the driveway long enough to get the defroster and the heater working; is it okay to do that, or are you facing some trouble?

Every year at this time, you'll probably hear someone weigh in on the topic of letting the car idle in the driveway long enough to get the defroster and the heater working; is it okay to do that, or are you facing some trouble?