Car issues can make people scratch their heads. If your car heater is suddenly blowing out cold air instead of heat in the middle of a bitterly cold winter, you have a good reason to be frustrated. Unreliable car heaters can make the cold winter months practically unbearable. Several things can potentially go wrong with automotive heaters because, much like a home heating system, there are many components working together to heat your car. If one or more of these issues is present, your vehicle may blow out cool air rather than heat:.
You should be getting hot air now. A blend door can get stuck open, resulting in all heat all the time, or stuck partially closed so that all you get is lukewarm heat. Share Pin Email. When a thermostat sticks open, it Heaher prevent the engine from warming up properlyor at Heater blowing cold air prolong the warming up period. Another possible culprit for your heater blowing cold air is the batteries in your thermostat. We value your privacy. For immediate assistance you may call Size is not a matter of preference. But clogs or excess dirt make it difficult for the air to properly enter the chamber where it is warmed up.
Lesian fuck. Extinguished Pilot Light
You may have a malfunctioning thermocouple an inexpensive fix or other issues that cause the pilot light to burn improperly. Sometimes the heater will blow out hot air and work beautifully, other times cold air. Ensure that your thermostat is set Teen bliss st johns county fl than the temperature in your home. Very helpful, I bought a new thermostat for my Hyundai Accent and it warmed my heater and brought the temperature gauge to operating temp. Is There Enough Water in the Car? Hence the hot air. Step 7: Turn the furnace on at the thermostat Turn your thermostat back to Heater blowing cold air and ensure that the temperature is set 5 degrees below room temperature. The heat and air blower comes Heater blowing cold air and works but its just air. There is a downside: if you're not handy with the spanners you should take your car to the garage. My car does not over heat.
First off, everything here applies to vehicles with water-cooled engines.
- Car issues can make people scratch their heads.
- JP is a self-confessed car and motorcycle addict, having saved thousands over the years working on and maintaining his vehicles himself.
- First off, everything here applies to vehicles with water-cooled engines.
- A friend of ours bought a new house recently.
First off, everything here applies to vehicles with water-cooled engines. Most cars on the road still have water-cooled engines, though, and their heating systems all work on the same basic principle. Hot coolant from the engine passes through a heater core, which looks and functions a lot like a small radiator, and a blower motor forces air through it.
The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. This is the reason that it takes a while for heaters to start blowing warm air. Thermostats are essentially valves that open and close depending on the temperature of the coolant.
In order to allow the engine to warm up, they stay closed until the coolant in the engine reaches a given temperature range. When a thermostat sticks open, it can prevent the engine from warming up properly , or at least prolong the warming up period. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause.
Another common problem is when air gets into the cooling system. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. The best way to check for this is a non-contact thermometer, which will allow you to check if coolant is flowing through the heater core or not. Some vehicles have a valve installed in the heater core inlet line that is operated by vacuum or a mechanical cable. Finally, a heater core can become plugged in more than one way.
When you hear about a plugged heater core, what that usually means is that corrosion and other junk has clogged up the internal tubes, and flushing will often clear it up. However, the fins of a heater core can also get clogged up with lint, pine needles, and other detritus that manages to get into the heater box. The fix for this, of course, is to break open or remove the heater box and clean the fins. Most of the reasons that a car heater will blow cold have to do with the heater core, but you can also have a mechanical, electrical or vacuum problem.
A blend door can get stuck open, resulting in all heat all the time, or stuck partially closed so that all you get is lukewarm heat. A blend door can also get stuck because of mechanical linkage or a vacuum line coming off, a switch going bad, or a number of other reasons.
Share Pin Email. Jeremy Laukkonen is a Seattle-based tech writer and the creator of a popular blog and video game startup. As a writer for trade publications and Lifewire, he has endeavored to break down complex technical subjects so readers of every tech level can understand them.
There are four main cooling system problems that can cause a heater to blow cold:. Stuck thermostat. Air in the cooling system. Plugged heater core. Coolant not flowing through the heater core. Continue Reading.
If you are unsure if your location is within our service area, please contact us to find out! When overheating, your furnace can trip a high limit switch , causing the furnace burners to shut off so that the heat exchanger does not crack. Started it up.. The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. For more information on what your heat exchanger is, how it works and what you need to do to keep it in good shape, take a look at: Furnace Heat Exchanger.
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Why is My Heater Blowing Cold Air?
Does your furnace blow hot air sometimes, but cold air other times? AUTO ensures that the blower will run only when the furnace heats the air. When overheating, your furnace can trip a high limit switch , causing the furnace burners to shut off so that the heat exchanger does not crack.
Do this : Turn off your furnace at the thermostat, and check the furnace filter. You may need to call a technician to help you reset the furnace. Do you have an older furnace with a standing pilot light?
You should see a knob with these 3 settings:. Step 3: Turn the knob to "off" and wait minutes This will shut down gas coming through the pilot. Step 5: As you press the knob, hold a lighter to the pilot opening until the flame lights When the flame lights, it should be a steady blue cone that hits the middle of the thermocouple a small copper bar.
Step 7: Turn the furnace on at the thermostat Turn your thermostat back to HEAT and ensure that the temperature is set 5 degrees below room temperature.
You should be getting hot air now. You may have a malfunctioning thermocouple an inexpensive fix or other issues that cause the pilot light to burn improperly. Do you have a high-efficiency furnace? Do you see water pooling around the furnace? When high-efficiency furnaces run, they create water condensate , which is emptied out a drain line. However, if that line gets blocked, water backs up into the furnace, causing an overflow kill switch to shut down the furnace to prevent water damage.
Besides blockages, the condensate overflow may also be caused by a broken condensate pump. If you suspect ice is the problem, then wrap the condensate line with heat tape and pipe insulation.
Why not give Coolray a call? Coolray is your Atlanta-area home comfort expert with specialists in heating, air conditioning, air quality and plumbing. Have more questions? Well, it could be multiple issues; some of them you can solve yourself.
So before calling a professional for help, try these 4 furnace troubleshooting tactics. Your furnace filter may be located here, next to the blower. Check your condensate line Do you have a high-efficiency furnace?
Let us explain. Common causes of condensate blockage are : Dust Dirt Mold Ice only during cold snaps and if the line runs through an unconditioned space Besides blockages, the condensate overflow may also be caused by a broken condensate pump. Need a furnace repair in metro Atlanta?
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