If you’ve been driving around with a cold car heater, you’re not alone. Many car owners have experienced this problem at one time or another. There are a few reasons why your car heater might be blowing cold air, but there are also a few easy solutions. Keep reading to learn more about why your car heater is blowing cold air and how you can fix it.
What Causes a car heater to blow cold air?
There can be several reasons why your car heater is blowing cold air. It could be that the coolant level is low, the heater core is blocked, or there could be a problem with the thermostat. If the coolant level is low, simply top it up and see if that solves the problem. If the coolant level is fine, then the next thing to check is the heater core. The heater core is a small radiator located behind the dashboard. If it is blocked, then the coolant cannot flow through it and therefore cannot heat up the cabin. The third possibility is that the thermostat is not working properly. The thermostat regulates the flow of coolant and tells the engine when to start heating up the cabin. If it is stuck in the closed position, then the coolant will not flow and the cabin will not get warm.
Car Heater Blowing Cold Air Cost To Fix
Assuming that you have already checked the most obvious things- the coolant level, the thermostat, and the heater core- and they are all fine, then there are a few other potential causes for your car heater blowing cold air.
One possibility is that the water pump is not circulating the coolant properly. This can be due to a number of things, such as a failing water pump, a blockage in the cooling system, or a loss of coolant. If the water pump is not circulating the coolant, then the coolant will not be able to absorb heat from the engine, and the heater will blow cold air.
Another possibility is that the heater control valve is not working properly. This valve controls the flow of coolant to the heater core, and if it is not working properly, then the coolant will not be able to flow into the heater core, and the heater will blow cold air.
Finally, it is also possible that there is a problem with the blend door or the actuator that controls the blend door. The blend door is what allows the hot air from the heater to mix with the cold air from the AC, and if the door is not opening or closing properly, then the heater will blow cold air.
If you are still having trouble with your car heater blowing cold air, then you may want to take it to a mechanic to have it checked out.
Low engine coolant level
If your car heater is blowing cold air, one possible reason is that your engine coolant level is low. When the engine coolant level is low, the coolant can’t absorb heat as well from the engine, and as a result, the air that the heater blows is less warm.
To check your engine coolant level, open the hood and locate the coolant reservoir. The coolant level should be at or above the “full” line. If it’s below that, you’ll need to add more coolant. Be sure to use the type of coolant specified by your car’s manufacturer.
If you’re frequently having to add coolant, there may be a leak in the system. A leak can occur in the radiator, hoses, or gaskets. If you suspect a leak, it’s best to take your car to a mechanic to have it checked out.
Lousy thermostat
If your car heater is blowing cold air, it could be due to a faulty thermostat. The thermostat is responsible for regulating the flow of coolant to the engine, and if it’s not working properly, the engine won’t be able to maintain the correct temperature. There are a few ways to tell if your thermostat is to blame:
If the engine is overheating, it’s a good indication that the thermostat is stuck in the closed position and needs to be replaced.
If the engine is running cold, it could be a sign that the thermostat is stuck in the open position and isn’t allowing enough coolant to flow.
If the engine temperature fluctuates wildly, it’s another symptom of a faulty thermostat.
If you suspect your thermostat is the problem, the best course of action is to take your car to a mechanic for a diagnosis. They’ll be able to tell for sure if the thermostat is the issue and can replace it if necessary.
Air in the cooling system
If your car heater is blowing cold air, it is most likely due to air in the cooling system. When the engine is first started, the coolant is cold and the air in the system is dense. The dense air prevents the coolant from circulating properly, and as a result, the heater blows cold air.
To fix this, simply bleed the air out of the system. This can be done by opening the bleeder valve and running the engine until the coolant is warm. Make sure to check the level of the coolant before starting the engine, and add more if necessary. Once the system is bled, the car heater should blow warm air.
Broken heater control
There are a few reasons why your car heater might be blowing cold air. One possibility is that the heater control is broken. This can happen if the knob is turned too far in one direction or if it gets knocked off entirely. Another possibility is that the heater core is blocked. This can happen if the coolant is not flowing properly or if there is a build-up of debris in the core. If the core is blocked, the heat will not be able to transfer from the engine to the cabin of the car. Finally, the thermostat may be set too low. This will prevent the engine from getting hot enough to generate heat.
Broken heater flaps/Seized blend door
If your car heater is blowing cold air, it could be due to a number of different issues. One potential issue is that the flaps that control the flow of air into the heater core could be broken or seized. Another potential issue is that the blend door, which controls the mix of hot and cold air, could be broken or seized. If either of these issues is the case, then it is likely that your heater will need to be repaired or replaced.
Clogged heater core
A clogged heater core can cause your car heater to blow cold air. The heater core is a small radiator that is located in the dash of your car. It is used to heat the cabin of your car. The heater core works by circulating hot coolant from the engine through a small radiator. The heat from the coolant warms the air that is blown into the cabin by the car’s heater fan.
If the heater core becomes clogged, the flow of hot coolant is restricted. This can cause the coolant to overheat and the car’s engine to overheat. When this happens, the car’s heater will blow cold air.
If you think that your car’s heater core is clogged, you should take it to a mechanic to have it checked out.
Refilling coolant
If you notice your car heater blowing cold air, it could be because you’re low on coolant. You can easily refill your coolant yourself by following these steps:
1. Park your car in a safe, level place and turn off the engine.
2. Locate the coolant reservoir and unscrew the cap.
3. Check the level of coolant and, if necessary, add more until it reaches the “full” line.
4. Screw the cap back on and start your car.
5. Turn on the heater and check to see if it’s blowing hot air.
If you’re still having trouble, it’s possible that there’s a leak in your cooling system. In this case, you’ll need to take your car to a mechanic to have it fixed.
Replace lousy thermostat
Your car’s thermostat is responsible for regulating the flow of coolant to the engine. If it becomes stuck in the “open” position, coolant will continue to flow even when the engine is up to operating temperature, resulting in a cold engine. Replacing a faulty thermostat is a relatively simple process that can be completed in a few minutes.
Unclog heater core
If your car heater is blowing cold air, it is likely due to a clogged heater core. The heater core is a small radiator that is responsible for heating the cabin of your car. It works by circulating hot coolant from the engine through a series of metal fins, which transfer the heat to the air.
If the heater core becomes clogged, it will not be able to circulate the hot coolant properly, and the air that it blows will be cold. There are a few ways that the heater core can become clogged. The most common is if the coolant becomes contaminated with dirt or other debris. This can happen if the coolant system is not properly maintained, or if the wrong type of coolant is used.
Another way that the heater core can become clogged is if there is a leak in the coolant system. This can cause the coolant to drop below the level needed to fill the heater core, which will cause it to become clogged.
If your car heater is blowing cold air, you will need to have the heater core replaced. This is a relatively simple repair, and can be done by a qualified mechanic.
Replace a broken heater flaps/seized blend door
If your car heater is blowing cold air, there’s a good chance that the heater flaps (or blend door) is broken or seized. Replacing a broken heater flap is a relatively easy repair that you can do yourself, and it’s a lot less expensive than taking your car to a mechanic.
To replace a broken heater flap, first, you’ll need to remove the old one. You can do this by disconnecting the linkage or removing the screws that hold it in place. Once the old flap is removed, you’ll need to install the new one. Make sure that the new flap is properly aligned and secured before reconnecting the linkage or screws.
If your car heater is blowing cold air because the blend door is seized, you’ll need to replace the entire door. This is a more difficult repair that will require you to remove the dash panel and disassemble the heater core. Once the old door is removed, you’ll need to install the new one and reassemble the heater core.
If you’re not comfortable doing these repairs yourself, you can always take your car to a mechanic. However, keep in mind that these repairs can be expensive.
Replace broken heater controls
If your car heater is blowing cold air, one possible reason is that your heater controls are broken. In order to fix this, you will need to replace the broken heater controls.
Heater controls are what regulate the flow of hot air from your car’s heater core to the inside of your vehicle. If they are broken, then hot air will not be able to flow into your car, and you will only feel cold air coming from the vents.
Replacing broken heater controls is not a difficult task, but it is one that should be done by a qualified mechanic. They will need to remove the old heater controls and install new ones in their place.
If you are having trouble with your car heater, bring it to a mechanic and have them take a look. They will be able to diagnose the problem and get your car heater blowing warm air again in no time.
Bleed the cooling system
If your car heater is blowing cold air, one possible reason is that your cooling system needs to be bled. When air gets into the cooling system, it can cause the system to become pressurized and can prevent the coolant from circulating properly. Bleeding the system helps to remove the air and restore proper circulation.
FAQs:
Q: Why is my car heater blowing cold air?
A: There are a few reasons your car heater might be blowing cold air. The most common reason is that the coolant level in your engine is low. This can happen if there is a leak in your cooling system, or if the coolant has simply evaporated over time. Another possibility is that the heater core is clogged. This can happen if the coolant is not circulating properly, or if there is debris in the system. Finally, the problem could be with the thermostat, which controls the flow of coolant to the heater core. If the thermostat is not working properly, it may not be allowing enough coolant to flow, resulting in cold air.
Must Read
1. Check the antifreeze levels in your vehicle. If it is low, it needs to be topped off.
2. Inspect the heating core for any leaks.
3. Check the thermostat to see if it is working properly.
4. Flush the cooling system and change the coolant.
5. Inspect the blower motor and clean it if necessary.
6. Check the fuse box for any blown fuses.
Conclusion
Thanks for reading our blog post on why your car heater might be blowing cold air. We hope you found the information helpful and that you are now able to fix the problem yourself. If you have any further questions, please feel free to contact us.
