Q: Car heater blowing cold air.

asked by on

The car heater is blowing cold air.

There are a few different reasons why your heater could be blowing cold air. First, there may be a problem with your Heater controls. Inside your dashboard there are a series of doors that direct airflow. If one of these doors isn’t operating correctly it is possible that only cold air will come out of the vents. The next possibility is that your heater core is blocked or restricted. The heater core is pretty much a small radiator inside your dash that the fan blows air through to get hot air for the interior of your car. Sediment can build up in your cooling system over and clog the small passages inside your heater core. When this happens the coolant can’t flow through the heater core and warm the air in the cabin. Sometimes the heater core can be flushed out, but it is also possible that it may need to be replaced if the blockages cannot be removed. The last possibility is that your engine is low on coolant. If coolant has leaked out and there is now air in your cooling system the air cannot transmit heat into the heater core. I would recommend you ask for help from a mechanic to check your car for these concerns so your heater can get back to normal function.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car heater blowing cold air.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: check engine light is on and gas light is flashing on my 1998 s420 mercedes Benz

Hi Jesse. Thanks for contacting us today. In most cases, a faulty gas cap or one that is not screwed on tight will cause the gas light and check engine light to illuminate. it's also possible that one of the...

Q: Crankshaftpositionsensor

A failed crankshaft position sensor can cause symptoms like this. When you crank the engine, the engine control unit looks for a signal from the crankshaft position sensor to determine where each cylinder is. When the signal is received, the...

Q: My audi smells like gasoline I read it could be a clogged fuel filter my mechanic wants to replace a plug on my fuel pump

What your mechanic says sounds more likely. There is no gasoline flowing to the turbocharger, so a flange or gasket leak is unlikely to be the cause. A leaking turbo flange would give you an exhaust leak and any odor...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...