• Home
  • Why does my heater work but not my AC in my car?

Why does my heater work but not my AC in my car?

Author of the blog (work in a car repair shop)
Ask Q

Why does my heater work but not my AC in my car?

If you notice that your thermostat gauge stays on the “C” even after the engine has time to heat up, you may have a broken thermostat. If the thermostat can't signal to the car that the engine is warm, the coolant won't be sent over to provide heat to your heater core and the air will stay cool.

Why does my heater work but my AC doesnt?

Check to make sure that your furnace has an adequate supply of fuel and that a draft isn't preventing it from burning its fuel. Try to turn off your furnace for several minutes, then turn it back on to see if the light re-ignites. If this does not work, it could mean that your furnace's igniter is faulty.

Why is my AC not working in my car?

There can be a number of reasons why you can air conditioning is not blowing cold air. The most common reasons could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge (regas) your air conditioning.

Is the AC and heater the same unit in a car?

Together, the two units—and everything that goes along with them—are known as the heating, ventilation, and air conditioning (HVAC) system. Your car's HVAC system is very similar in that the A/C and heater are mostly separate from one another. The A/C uses refrigerant, while the heater uses hot engine coolant.

Does AC compressor affect heat in car?

Air Conditioning Compressor The car's compressor does more than just cool the air before it passed through the car. You can use the a/c compressor while controlling the heat setting of the car to control the climate within. Doing so will help dehumidify the air, reducing fogged up windows.

Why is the AC not cooling?

The Filters Are Clogged Perhaps the most common cause of AC issues is clogged filters. Dirt, pet hair, pollen and dust can clog your filters. When filters get clogged, they begin to restrict the flow of air through your AC. The result is that the AC doesn't cool your indoor air effectively.

How do I know if my AC fuse is blown?

How do I know if my car AC fuse is blown?

What controls the AC in a car?

Thermal expansion valve: To control the air temperature, the AC system has a valve that controls the flow of super-cool refrigerant to the evaporator. This allows your car to regulate just how cold the blowing air gets. There are several types of valves, but they all do the same thing.

Does the heater core have anything to do with the AC?

The heater core will not cause the A/C to not blow cold. If your A/C is working properly with the correct amount of refrigerant, then you may have a temperature blend door not working and staying on heat mode.

Will heater work if AC is broken?

If your air conditioner is broken and will take some time to get fixed, avoid using heat-generating appliances. Instead of using the stove or oven to cook, try using an outdoor grill instead. Avoid using the washer and dryer and the dishwasher too. Turn off all lights when not in use.

Is it worth replacing compressor on AC unit in car?

Can a car run without an AC compressor?

You will be fine as long as you don't need or want AC in your car. Your AC pulley is a free spinning pulley that has a clutch on it. It will spin freely until you turn the air conditioning on. If the clutch doesn't work properly, you will still be able to drive your car.

Does the furnace need to be on for the AC to work?

However, they still operate independently of each other. Does the furnace need to be on for the AC to work? No! Your air conditioner should run on its own, even when the furnace is off.

Why is my car AC blowing out hot air?

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.

Why would AC suddenly stop blowing cold air?

First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.

Can a blown fuse stop AC from blowing cold air?

While this prevents serious trouble such as electrical fires, it also means that a single blown fuse can cause the entire air conditioner to stop working.

Is there a reset button on AC compressor?

An AC's reset button is typically red and visible, so it should be easy to spot. If you don't see a reset button on the outside, it could be located inside the unit behind the service panel. Before poking around inside the machinery, be sure to cut power to the system by flipping off your circuit breaker.

What happens if car AC fuse is blown?

If any of these fuses are blown, it could lead to your AC system either not coming online, or only working for a few minutes. These fuses are usually in a fuse box in your engine bay, but sometimes they can be found in a fuse box inside your cabin, often on a kick panel or low on your dashboard.

Is there a fuse for car air conditioning?

A typical vehicle will have multiple fuses connected to the operation of the AC unit. To locate the correct AC fuse(s) in your vehicle's fuse box—and the fuse box itself—refer to your owner's manual. You can usually tell a fuse is blown if the wire within the fuse is visibly melted or burned.

Why would AC suddenly stop working?

If your air conditioning unit has stopped working, there are many possible reasons that can explain why. It could be your thermostat, your air filter, a problem with the condenser or compressor, or it may just be time to replace the unit, especially if it's over 10 years old.

Can I drive without AC fuse?

Leave the fuse in. You won't do any (more) damage to the A/C system. With no refrigerant, there is no refrigerant pressure. The pressure switch won't allow the clutch to engage with low pressure.

How much does it cost to replace an AC compressor in a car?

What does it cost to replace AC compressor?

How much does a AC compressor cost?

What does the AC button in a car do when the heater is on?

The A/C button turns on the compressor, that is all it does. The compressor is now ready to come on if it is required to cool down the interior of the car.

Why is my car’s heater not working?

The potential issues here vary whether your heating has gone out or your car’s AC system is on the fritz. As you can see, both systems are very different. However, if you’re experiencing problems from the HVAC controls, then it’s possible that the same issue will prevent both your air conditioning and heater from working.

Why is the air conditioning in my car not working?

This article has been viewed 1,463,468 times. To diagnose why the air conditioning in your car isn't working, start by turning your car on and setting the AC to full blast. If strange noises are coming from the AC, there could be an issue with the compressor and it may need to be fixed or replaced.

Is the AC connected to the heating in my car?

While both the heating and AC are connected - to an extent - within your car, they’re actually separate systems. Your car’s heater uses heated engine coolant to warm the air that is blown into the cabin, while the air...

Why is my air conditioner not blowing hot air?

Either the blower isn't working, in which case you may get warm air but not much of it, or it is blowing air but it may not be very hot. Here is what to check if your heater or defroster isn't working:

Below you will find two interesting articles on a similar topic 👇

Why is my heater and AC not working?

What causes the AC to stop working in a car?

Tired of looking for a video for your question?

Video Answer below 👇

Were our answers helpful?

Yes No

Thanks so much for your feedback!

Have more questions? Submit a request

FAQ for the last Day

  • Does Jiffy Lube do heater core flush?
  • RADIATOR ANTIFREEZE/COOLANT SERVICE That's why Jiffy Lube® offers a Radiator Flush to keep your engine with a fresh supply of antifreeze. This antifreeze will keep fluids from freezing and the flush will help remove containments.How much does it cost to flush a heater core? Usually, repair shops will use a dedicated flush machine to flush the entire cooling system, rather than flushing just the he...

  • Can a coolant flush cause problems?
  • Can a radiator flush cause problems? Yes and no. Yes, because a radiator flush is going to flush out any corrosion, debris, rust, and other contaminants. If the flush isn't thoroughly to clear all of that out, it can loosen up those things which could clog up the cooling system, including the radiator.Is it worth doing a coolant flush? Coolant flushes provide many benefits to your cooling system....

  • Can a clogged radiator cause no heat?
  • Poor Internal Heating : A clogged cooling system and heater core could lead to lack of heat inside the vehicle due to the inability of the hot engine coolant to pass through the heater core.A clogged, cracked and leaking radiator will not be able to give off any heat. When the cooling system and the heater core become clogged this evidently leads to a lack of heat that is usually present inside th...

  • Why is cold air coming out of my vents when the heat is on?
  • This issue could be caused by an improper thermostat setting. Check that the fan blower switch is set to “auto” and not “on.” When the “auto” setting is chosen, the fan will only run during a heating cycle and won't push air that feels cooler through the vents in between cycles.If your heat is on and cold air is blowing through the vents, there is likely a problem with your heating equipment. Issu...

  • How do I know if my oil compressor is low?
  • Unusual Humming Noises. One of the earliest signs that the AC compressor is operating with an insufficient oil amount is the emergence of humming noises from your air-conditioning system. At the same time, you may notice that the compressor has suddenly become hard to start.The first thing you will notice if your car has low oil pressure is the warning light on your dashboard. The oil pressure sen...

  • How do I know if my air compressor needs oil?
  • It may be found on the base of the pump for reciprocating type compressors or on the sump tank in a rotary screw compressor. In the middle of the sight glass, you will see a dot. Ideally, you want the oil level to be in the center of the dot. If the oil level is below the dot, your unit needs more oil.Observe the amount of oil in the air compressor through the sight glass or by lifting out its dip...

  • Why does my car feel cool when I crank it up?
  • During the winter when you crank up your heat, the coolant is brought over from the engine to the heater core that then blows warm air into your car. It can feel cool for the first few minutes because the engine has to warm up in order for the coolant to heat up and provide heat to your interior.What causes an engine to run cool? When we say an engine runs cold, we mean it's not reaching full oper...

  • Why is my car AC not blowing cold air?
  • The most common causes of broken air conditioning are leaks or compressor issues. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC.How do you know if your car AC needs recharged? Your AC Blows Warm Air If your AC has been blowing warm air from the in-cabin vents, this is a...


Leave a Comment

Email us