Heater not working

My air conditioning works really well with no problems or issues and gets cold as it should but when it comes to my heat it does not work it only blows out cool air and never gets warm. So my question is do you know what could cause this issue?

My car has 180000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. There are usually three potential culprits that cause this issue. First is that the heater core inside the dash is broken or clogged. Second, it could be a problem with the vents from the heater core to the vents on the dash. Third, it may be caused by a heater thermostat in the cooling system that directs warm coolant to power the heater core. Your best bet may be to have a local professional, like one from YourMechanic, inspect the heating system in order to have this corrected in time for winter.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Ford Crown Victoria heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
The most common reason for a car`s heat system not working is a lack of coolant. If your car`s heat system isn`t working, the first thing you should check is the coolant level. You can usually find the coolant reservoir in a housing near the front of the car, near the engine.
You Don`t Have Enough Coolant

If your truck doesn`t have enough coolant, your heating system can`t send it to the heater core. It`s normal for cold air to blow out of your vents for the first few minutes after you turn on the heater. But it should warm up fast. If it doesn`t, your coolant level might be low.

Hello there, many faults will cause a lack of heat in your 2012 Ford Focus. When the air is not getting hot, the problem can either be with the air inside the car or a cooling system fault. The most common faults are the heater core, blend door actuator, thermostat, air in coolant, or a failing water pump.
There are a few reasons only one of your radiators won`t heat—some issues you may be able to fix on your own, while others might require some professional help. You have air pockets in the system. You have a radiator leak. There`s a radiator thermostat issue.
One of the most common issues with a heating system not functioning is dirty air filters. If your air filters are extremely dirty, then the airflow can be blocked. Check for clean air filters, vents, and registers. Make sure there are no rugs or furniture blocking vents or registers as well.
If there isn`t enough coolant in your system, the heater core will blow cold air into your car. Solution: If you confirm that a low coolant level is the source of your problem, you simply need to top off your coolant. You may want to check for leaks as well if you just recently refilled your coolant.
You Have Cold Air Blowing Out The Vents When The Heat Is On Because of a Dirty Air Filter. Hiding in the filter of your heating system is dirt and debris. If you aren`t cleaning it regularly, this will accumulate over time, leading to problems with your heating system`s efficiency.
The first step of diagnosis should be checking the amount of coolant in the system. If your Ford is low on coolant, it won`t be able to properly send heat to the heater core, thus an issue arises. Check the coolant levels at the radiator and reservoir when the vehicle is completely cooled and add coolant if needed.
The most common reasons a Ford Focus heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
The radiator to bleed first

Making sure your central heating is switched off, you should start with a downstairs radiator that is the furthest away from your boiler. Work your way through the radiators getting closer to the boiler, then go upstairs and repeat the process.

If you are getting hot water to the taps but no hot water to your radiators, it may be a sign that your diverter valve is stuck. Rectifying this fault is a job for a professional Gas Safe registered engineer.
What is a Thermal Fuse? A thermal fuse or thermal cutoff is a safety device which open circuits against overheat. It detects the heat caused by the over-current due to short circuit or component breakdown.
Temporarily Repair the Crown

Purchase some dental cement from a pharmacy. Clean the tooth and then apply dental cement to the affected tooth to cover the exposed nerve. If you still have the crown, then you can use dental cement to stick it back onto the tooth.

Temporarily Repair the Crown

Purchase some dental cement from a pharmacy. Clean the tooth and then apply dental cement to the affected tooth to cover the exposed nerve. If you still have the crown, then you can use dental cement to stick it back onto the tooth.

Because placement of dental crowns requires removal of small amounts of the outer enamel, there is less insulating enamel between the outside environment and the sensitive dentin that envelopes the pulp.
Tooth sensitivity is common after the placement of a dental crown. Symptoms like pain and cold or heat sensitivity can be severe in some people, but they tend to ease in a few days.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Windshield wipers stopped working. They’ll suddenly stop working then suddenly start working again. Has been happening for a week.
ANSWER : The problem you are describing likely stems from an intermittent electrical fault in the wiper circuit. The windshield wiper system uses a small electric motor to move the wiper arms that you see on the windshield. That electric motor is controlled through a switch, relay, fuse, and wiring. One, or more, of those electrical components has failed although it is also possible that the mechanical arms are binding (seized, if the lubricant has dried out) thus causing the electric circuit to the motor to overload. Regardless of the underlying fault, if you request a non functioning wiper diagnostic/repair, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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Just replaced head gasket, changed crack sensor new plugs. The check engine light is on, but dim, the only other light that the dash is a normal battery indicator. The fuel pump is not running when switch is turned on, the power windows don’t work, it turns over but not firing. It’s like only one part of the system is working. Also the heater fans work even if the switch is off.
ANSWER : I would first look at the diagnostic trouble codes. Those codes are available because the check engine light is on. If the fuel pump is not running (momentarily) at key on, that fault alone will prevent the car from starting as there will be no fuel pressure. Pump output and pressure can be directly tested and you can also check for electrical power to the pump. To find out why the engine will not run, the recommended diagnostic is a no start diagnostic. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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My dash board don’t work my front light work when I change my light into high beam and my back window won’t go down
ANSWER : As unfortunate as it is, your vehicle would be considered flood damaged. Diagnosing electrical problems in a flood damaged vehicle is nearly impossible. This would take many hours or even days to determine which wiring harnesses and circuits have been affected. Then nearly all of the wiring under the dash would likely require replacement as well as many sensors and switches. On a BMW vehicle, the amount of wires and switches are likely more than that of a lower end vehicle. Due to the inefficiency in cost, you would likely be able to purchase another BMW like yours for less than what it would cost to fix your car. Many insurance companies would consider this type of damage to total out the vehicle unfortuantely.

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Overheating issue, when heater is on its normal temp. but if heater is off it begins to overheats, until heater is turn on again.
ANSWER : It sounds like your engine might have a restriction in the cooling system. If the cooling system has a restriction that prevents its flow, this will cause the engine to get hot. The heat is dissipated from the cooling system by means of the radiator.

When a restriction exists sometimes the radiator alone is not enough. The heater core is like a small radiator inside the dash and is also another means of dissipating the heat from the cooling system. So essentially when the heat is on you are introducing a second radiator into the system which will help to cool the engine down.

In order to get this fixed, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the overheating issue firsthand and help you make the necessary repairs.

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My AC does not always work. If I fiddle with the blower knob I can ususally get it to work on the lowest setting.
ANSWER : Hi There,
It sounds like you may have a faulty blower motor resistor. The highest speed setting may still work because in most cars in the highest fan speed settings the current bypasses the blower motor resistor. In some cars, if the resistor is failed, the fan may stop working completely. Another reason a blower motor resistor may fail is when the blower motor has a mechanical problem or when a foreign object jams the blower motor fan blade and prevents it from spinning freely. This leads to increased current through the resistor and causes it to overheat and fail. I would suggest having an expert from YourMechanic come to your location to diagnose your system to determine what may be causing the fan not to work properly.

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All dashboard lights and tail lights do not work after driving through a lot of snow. Headlights work. And brake lights work.
ANSWER : Hello. We’ll be happy to help you. There are a few things that I recommend checking to discover why your lighting system is malfunctioning. The headlight dimmer switch should be checked. Along with the wiring harness above the right front tire behind the fender well cover. Also
the main fuse under the hood should be inspected because other people with your particular vehicle have had similar lighting issues if that fuse goes bad. It will be a great idea to check the rest of the fuses in that area too while checking the main fuse. Once the fuses are checked inside of the main fuse box then I would check the fuses inside of their interior fuse box. The interior fuse box should be located on the driver side of the dashboard near where your legs would be. If you need more assistance with repairing your vehicle please keep in mind that our organization provides Mobile Mechanics who can help you diagnose and repair your vehicle, all at competitive rates.

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Heater / A/C are not working properly. They are weak and the highest and lowest settings do not work at all. Any ideas what it could be?
ANSWER : Hi there. Check the power from the switch on each setting and to the blower. See what the voltage is at each setting. If the voltage is low or not showing, then the switch is not working and needs replaced. The switch has a resister built in it to make the blower have different voltage outputs which makes the blower have multiple speeds. However, the first setting and the last setting could have a burned element inside making only the second and third setting work. Once you have the blower working properly, if there is no heat, then check the heater control valve in the engine compartment for if the vacuum line has came off or if the valve is not working. When the engine is at operating temperature, check the temperature of the coolant hoses to the valve and after the valve. If the hoses are the same temperature and the valve is shut, then the valve is on or not working. If the temperatures are different, then the valve is off or not working. If you need further assistance with your heater and a/c not working, then seek out a professional, such as one from Your Mechanic, to help you.

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Honda Civic 2008. AC stopped working suddenly and engine check light came ON for a day.Next day AC worked and no engine light.
ANSWER : Hi there. In both cases, when an AC system is not working and a warning light is coming on the dashboard, typically a professional mechanic will complete the same initial inspection, which is to download the stored error codes that triggered the warning light initially. This tends to give them an idea as to what is causing the problems. This could be something as simple as an electrical relay that is faulty or loose or an indication of a computer related "glitch". Either way, the best way to move forward is to have a professional mobile mechanic complete a check engine light inspection.

Read Full Q/A … : Heater not working