14 Feb. 2016 Heater Blows Cold Air? Heater Blows Cold Air? A heater that blows luke warm or cold air can be the symptom of several possible issues. It could be as simple as low coolant or it might be something more serious. But there are a few tests you can do to clue into the issue. The heater is a pretty… Jeremy Turner CategoryBad Heater, Blend Door, Evaluations, Heater Core, Low Coolant, Repair, Services 0 Comments