Heater Not Blowing Hot Air

Heater Not Blowing Hot Air. You jump in your car on a chilly , wintery morning and crank the warmth up. But after a couple of minutes, you notice it still isn’t blowing hot air! What gives? Learn what’s keeping you from enjoying your car’s warm air and what you’ll do about it.


Engine coolant contains a particular mixture of antifreeze and water, which helps keep your engine from overheating or freezing. If your car’s coolant has the proper ratio of antifreeze and water, it shouldn’t freeze within the winter or get too hot within the summer, ensuring that your car’s cooling system can effectively absorb and dissipate excess heat created within the engine.

When you run your car’s heater within the colder months, a number of this excess heat is blown into the cabin to assist you stay warm and defrost your windshields! Over time, contamination in your cooling system can make your coolant more vulnerable to freezing, which can end in your engine overheating and your heater not working!


The heater core looks (and works) almost like your car’s radiator — it’s made from a series of narrow tubes and fins. However, while the radiator dissipates heat to the encompassing air, heat from the heater core is blown into the passenger compartment by a blower fan.

Heater Not Blowing Hot Air

The heater core’s maze-like network of tubes is vulnerable to clogging and leaks, reducing the coolant level or flow through your engine’s cooling system. Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may cause your engine overheating and your heater not blowing hot air.

Other signs of a faulty heater core include a sweet-smelling scent in your car, windows that become particularly fogged-up, and puddles under the dashboard or on the passenger-side floorboard.


Your car’s thermostat may be a valve that opens and shuts to manage the coolant flow to the engine and radiator. Although it’s a reasonably simple device, a functioning thermostat is significant to keeping your engine running at optimum temperature.

Heater Not Blowing Hot Air

Heater Not Blowing Hot Air
Heater Not Blowing Hot Air

A damaged thermostat may become stuck within the open or closed position. When stuck open, the thermostat may allow an excessive amount of coolant to flow, preventing your car from reaching its optimum operating temperature, thereby causing a decrease in performance. On the opposite hand, a thermostat that’s stuck within the closed position won’t allow coolant to circulate, interrupting the system that cools your engine and heats your cabin. Yikes!


When you crank up the warmth in your cabin, the heater core captures heat from the coolant and transfers it into the cabin within the sort of warm air. The blower fan is liable for ventilating that warm air from the heater core through your car’s vents! However, when the blower fan isn’t working correctly, you’ll notice little to no airflow coming from the vents.

Heater Not Blowing Hot Air

Various issues may cause your blower fan to malfunction, including a blown fuse or damage to the blower fan’s internal components. Regardless, if you’ll barely hear or feel a breeze when your car heater is running, issues with the blower fan could also be to blame!


It’s hard to enjoy the ride when your teeth are chattering! Plus, many of an equivalent issues that prevent your car’s heater from blowing hot air also can cause engine overheating and reduces in performance!

Get knowledgeable opinion on what’s causing your car heater to malfunction and which services and repairs can help fix it at your nearest Firestone Complete Auto Care. With thousands of locations across the country, we’ll get you back on the way to your holiday getaway in no time!

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