Why is My Car Heater Blowing Cold Air?

November 22nd, 2017 by

Nissan Interior Air Conditioning Unit

You climb inside your car from the bitter cold and flip on the heater to warm up, but something is wrong: “Why is my car heater blowing cold air?” The problem usually stems from one of two things. Your coolant may not be flowing properly, or your blower motor may be malfunctioning. So, what should you do? Let’s go over your options.

Heater Mechanics

Most vehicles have a water-cooled engine, which functions like a small radiator. The hot coolant travels through the heater core, and the heated air is forced through the interior with help from a blower motor. Some vehicles, like older models, use air-cooled engines. Newer models may use electrical heaters. If you don’t know what kind of heater you have, then consult your manual or just head to our service department for expert advice.

Common Cooling Issues

What’s the most likely cause of your heater woes? Your cooling system. But, you’ll need to pinpoint the exact location of the problem if you want to enjoy a cozy cabin. Here are some common issues:

  • The thermostat may be stuck, causing the coolant to stay pooled in one area rather than circulating.
  • Air bubbles may have gotten trapped inside your heater core, which needs to find a way out.
  • Your heater core might be plugged with corrosion or debris, which prevents the coolant from flowing.

Other Heater Problems

So, what about vehicles that don’t use a water-cooled heating system? If you have an air-cooled or electrical system, then the issue may be a little more complicated. It’s worth a visit to the dealership to sort out the problem. Your electrical system may not be getting the power that it needs or a component may be broken.


We’ve gone through some of the most common problems with heating systems, but if you want a definitive answer to the question  “Why is my car heater blowing cold air?”, it’s time to take a trip to Jeffrey Nissan. Our expert technicians have the experience and the skills to get your car back to normal, so you can enjoy a toasty warm cabin all winter long. Feel free to schedule your service.