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Why is my heater not blowing hot air in my car?

Author of the blog (work in a car repair shop)
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Why is my heater not blowing hot air in my car?

Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air.The reasons why your car heater not blowing hot air are your coolant or antifreeze may not be getting up to temperature, low coolant level, a faulty thermostat, the heater core is actually blocked, heater control valve, bad air blower. There are various reasons why is your heater not blowing hot air despite being turned on.

Why is the air coming out of my car heater not hot?

If the heater control valve is the culprit, the air coming into your vehicle won’t feel warm. The heater core may also leak coolant. The heater core is clogged from debris in the cooling system. If debris has caused a clog in the heater core, it will need to be replaced. A faulty blower motor.

Why is my air conditioner not blowing hot air?

Either the blower isn't working, in which case you may get warm air but not much of it, or it is blowing air but it may not be very hot. Here is what to check if your heater or defroster isn't working:

Should you turn your car heater off when driving?

While driving on a nice day you may turn your heater off because it’s not needed. However, you notice hot air is still blowing out the vent. After turning the knob to full cool, hot air is still coming out and so you turn off the AC completely. But then why do you still have hot air blowing?

Why is my blower fan not working in my car?

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 can barely hear or feel a breeze when your car heater is running, issues with the blower fan may be to blame!

Below you will find two interesting articles on a similar topic 👇

How much does it cost to fix an overheated engine?

What is the fastest way to cool down a car engine?

Tired of looking for a video for your question?

Video Answer below 👇

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FAQ for the last Day

  • Can you run a car without a thermostat?
  • Most automobile mechanics will tell you it is not a good idea to drive your car without a thermostat installed. If your thermostat becomes stuck in the closed position, though, this will cause your engine to overheat and make driving your car impossible.Yes, you can drive a car without a thermostat. The thermostat function is to force the engine to operate at a specified temperature. Combustion en...


  • Why is my car running hot but not overheating?
  • This problem can be due to a low coolant level in the radiator, a faulty thermostat, a bad radiator, a damaged head gasket, a faulty water pump, or it might just be a bad temperature sensor or gauge giving a false reading.Car Running Hot but Not Overheating: The Reasons Failed Temperature Sensor. The simplest reason for car running hot but not overheating is a failed gauge itself. ... Broken Tempe...


  • How long does it take for heat to work after adding antifreeze?
  • It typically takes a solid 30 minutes for an engine to cool down enough for it to be safe to handle. If you'd rather let a professional handle the problem, it's time to call for a tow truck.How long after adding coolant will heater work? Can you drive right after adding coolant? Yes, run the engine After you do any work involved with draining the coolant you will either have an exact process to r...


  • Why does my heater take forever to warm up?
  • A few things that cause automotive heaters to work less well are low coolant levels in the radiator, a faulty heater valve, or the thermostat is stuck open. Have a certified mechanic replace your thermostat if necessary or diagnose and repair other cooling system issues, such as leaking coolant.How long should it take heater to get warm? On average, once you turn on your furnace, it should take ab...


  • Will low antifreeze cause no heat?
  • If your radiator is very low on coolant, you'll get no heat. If your levels are okay, you either have a bad water pump or a thermostat that isn't opening.If you’re leaking antifreeze but not overheating or you have a car leaking antifreeze when parked, you still have a chance to repair your vehicle for a lower cost. If you continue to drive your car with low antifreeze your vehicle will eventually...


  • Will an open thermostat cause no heat?
  • A stuck-open thermostat can also cause lack of heat from the heating system. The Check Engine light may come on too. Thermostat stuck closed: When the thermostat is stuck closed, the engine might overheat.If the thermostat says heat on but no heat, there might be quite a few reasons for that. The filter is dirty Perhaps, the most common reason for such a situation is a clogged filter. All you woul...


  • What happens if car thermostat is stuck open?
  • If the thermostat becomes stuck in the open position, there is continuous flow of coolant into the radiator causing the engine to run cold. Overcooled engines run inefficiently, which leads to increased fuel consumption and higher emission levels and engine parts enduring more wear.What are the symptoms of a stuck open thermostat? Thermostat stuck open: When the thermostat is stuck open, the engin...


  • Will antifreeze help with the heat in my car?
  • Engine coolant contains a precise mixture of antifreeze and water, which helps keep your engine from overheating or freezing.Will adding antifreeze help heat? Adding coolant does nothing to address the problem that caused your engine to overheat in the first place, but it often allows you to drive safely to the nearest repair station. “A professional will need to inspect your car's cooling system,...


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