Why Is My Car Heater Blowing Cold Air?

Car Heater Issues

With winter just around the corner, there’s something that happens in Mississippi that typically doesn’t occur: we may switch on the car heater. Needing a little extra heat on those chilly mornings is crucial for a cozy drive in the Gulfport, Pascagoula, and Waveland areas. However, if the heater is emitting nothing but brisk air, what is a driver to do?

The team at Pat Peck Nissan is here to help if you’ve recently asked yourself: “Why is my car heater blowing cold air?” The most common causes of cold air coming out from your car heater are:

  • Low coolant
  • Heater core issues
  • Clogged heater controls
  • Faulty thermostat
Below, our team will go into more details about these common causes, and what you can do to heat things up again.

Why Your Heater Is Blowing Cold Air

Low Coolant Levels

It’s a challenge trying to heat up your car’s cabin to only be met with chilly air. But that doesn’t mean the issue can’t be reversed. All you need to do is find the source of the problem.

Since vehicle heaters are complex components, there are several reasons why it might not be working as expected. If one or more of the following issues is occurring in your vehicle, you could find your heater blowing cold air rather than heat:

Low Coolant Levels: Surprisingly enough, your vehicle uses coolant (a mixture of antifreeze and water) to not only cool your vehicle, but to heat it as well. When coolant levels are low, your heater core won’t have enough oomph to produce that heat.

The Solution: Top off your coolant. If that doesn’t provide the warm air you hope for, you may have a leak in the system. Look for cracked hoses or loose clamps and get them repaired by a professional.

Heater Core Issues: One of the most common culprits of heater issues has to do with the core of the system. This can result in: the coolant not getting to where it needs to go to generate heat; the air blower working improperly; or clogs in the system. If you’re experiencing fog inside the car, coolant being used quickly, an overheated engine, or a fruity smelling odor in your cabin, this is probably the heater core.

The Solution: Head to your authorized service center and have a technician flush out the heater core’s passages. If this doesn’t resolve the issue, the core may need to be replaced.

Clogged Heater Controls: After years of driving, the buttons and controls of your heater may get gummed up. If they’re not working as they should, they can’t operate the heater control valve under the hood, resulting in limited or zero heat.

The Solution: Cleaning the buttons may help, but replacement buttons or a new heater control valve may be needed as well.

Faulty Thermostat: If the gauge on your thermostat has been acting funky, it may be broken, which could end up sending cold air into your vehicle. When the thermostat is broken, it won’t be able to tell if your vehicle is warm or cold. This then leads to the coolant not being sent to the heater to supply warm air.

The Solution: Thermostat replacements are inexpensive and quick procedures that could help the heater work once again. Though this can be done yourself, it involves draining the coolant in your vehicle, which is best suited for a professional facility.

Crank the Heat this Winter with Help from Pat Peck Nissan

Car Heater Service

Whether your heater is blowing cold air into your cabin, or you’re just preparing for the upcoming chilly season, our service center can help. We invite all drivers in the Gulfport, Pascagoula, and Waveland area to schedule an appointment today, so we can get your heater working properly. Stay warm out there!


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