No hot air from heaters

No hot air coming from heaters water level is fine.

My car has 62000 miles.
My car has a manual transmission.

Experienced mechanics share their insights in answering this question :
This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your heater core.

How to Identify and Fix Common car Problems ?

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

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 most common reasons a Ford Ranger heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
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.

If your coolant level is a-okay, but your car heater is blowing cold air and your engine is overheating, then you have a clog in your cooling system. Conversely, if your engine temperatures are unrealistically low after a drive, your thermostat is likely the culprit.
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.
The lukewarm air appearing in your heater can be the outcome of a leaky duct. If your air ducts are leaking, cool outside air is making its way into your ductwork. This can cause the air to really feel only lukewarm. The repair: Duct sealing.
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 F-150 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 cause of a vehicle`s air conditioner not getting cold enough is that it needs to be recharged. You can recharge your refrigerant by yourself, but to save time and make sure the job is done correctly you should make an appointment with your local professional auto shop.
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.
A car A/C blowing hot air is often the result of a refrigerant leak. Refrigerant is a liquid that circulates through your car`s A/C system, expanding and contracting as it removes heat and humidity from the cabin. None of the other A/C components will function correctly without proper refrigerant levels.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Hot air mixed with cold blows from air conditioning
ANSWER : Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

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My heater blows out warm air instead of hot air when my temperature dial is turned as hot as it can go.
ANSWER : Hello there, warm air coming from the vents on your 2001 Ford Taurus will be caused by a variety of issues. The heating system for your vehicle and the air conditioning system are completely separate and likely unrelated. A low coolant level in your vehicle will cause the heat to be unable to function properly and is the most likely culprit for the air being warm and not hot.

If the coolant is very low it likely means a leak is present in the vehicle. A few common leaks spots are the water pump, thermostat housing, radiator, radiator hoses, heater hose, or the heater core itself.

If you’d like to get this resolved, a qualified technician such as one from YourMechanic will be able to diagnose your heating issues and make any repairs required to restore proper operation.

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Why is my air system blowing out hot air in spurts and why is the temperature gauge nearing hot while in use?
ANSWER : This can be caused for a variety of reasons such as a malfunctioning thermostat, a radiator not flowing properly, a faulty coolant temp sensor or AC refrigerant not properly being supplied to the AC compressor. Your car’s AC system puts a heavy strain on your car’s engine when it runs as it requires a lot of power to run. When the AC compressor comes on it puts additional strain on the motor that may be already struggling to stay cool as a result of any of the issues named above. I would recommend having an expert from YourMechanic come to your home to diagnose and repair.

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While driving defroster set to hot blows hot air as it should, while idling it is blowing cold air.
ANSWER : First, the coolant level should be checked to make sure the radiator is full. While the overflow tank may be full, the radiator cap must be taken off to check the level inside the radiator. If you find the level is very low, you have a coolant leak that must be fixed. If coolant levels are normal, an engine thermostat or heater control problem may be what you’re experiencing. Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at your lack of heat concern to offer a more personal diagnosis.

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My car heater will blow hot air and drive fine for 30 minutes then my heater blows cold air and my car overheats
ANSWER : Hello. With the recent repairs that have been made to the vehicle, there is only one main heating component that you have not looked into. This would be your heater core. The heater core is responsible for pulling hot coolant from the engine. This hot coolant runs through the heater core as the ambient air is pushed through to warm before entering the cabin. If the coolant can’t flow through the heater core, then the air will blow cold. This can be caused by a clog, a faulty switch, or a process known as electrolysis (electrical current running through coolant). Unless there is a clog that can be dislodged, these issues will all result in a new heater core. To get a precise diagnosis of the problem, I recommend having an expert inspect the overheating problem so this can be resolved.

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A question regarding my car blowing intermittently hot and cold air.
ANSWER : It sounds like you have failed cooling fans. When the car is at idle, the fans should run to pull air across the A/C condenser to regulate refrigerant temperatures and the radiator to regulate coolant temperature. If these fans fail, then these components will receive no airflow at idle, but will still get airflow while driving due to the car moving. I would suggest having a qualified technician, such as one from YourMechanic, inspect your fan operation, as well as the rest of the cooling system for proper operation.

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My air is blowing cold-hot-cold-hot-cold-hot…
ANSWER : It is possible that you have a leak in the AC system. There are pressure switches that will turn off the compressor if the pressure is too high or too low. The low refrigerant level could cause the AC compressor to cycle on and off. If you would like to have this done, a certified technician from YourMechanic can come to your car’s location to diagnose the AC system and make the correct repair.

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I have a 2006 dodge charger 2.7 that has been overheating and the heater is blowing out cold air, warm air, and sometimes hot air
ANSWER : Hi there:

Overheating issues can be very difficult to pinpoint without completing a physical inspection. If your heater is not blowing warm air, it’s very possible that you have a clogged heater core coolant line; which can cause engine overheating or the heater core valve is damaged; which can also cause the same situation to occur. It’s best for you to have a professional mobile mechanic come to your location and complete a car is overheating inspection so they can pinpoint the source of your issues and recommend the right repairs.

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