If that is really true then the trouble would have to be with the vent doors somehow, it would seem to me. The AC button has a light on the button that illuminates when the air conditioner is turned on. If you want to know more, you can read our article Why should I replace my Cabin Air filter. Your car mechanic can utilize special car AC repair tools and diagnostics to determine whether or not your vehicle is running short of refrigerant. This can easily be fixed by checking the air filter and changing it if it is dirty. The last cause on this list is a faulty heat controller. When you turn the heat controller on the AC control unit, there needs to be something that controls the heat inside the car. If the pressure gets too high – it will stop the AC compressor from cooling the system anymore because of safety reasons. Faulty Heat Controller / Air Condition Control Unit, 9 Causes of Car AC is Not Blowing Cold Air, 7 Causes Why Car Temperature Gauge Stays on Cold, Alternator Not Charging - 6 Causes & Diagnostics, 7 Causes of Radiator Fan Is Not Coming On. So why is blowing warm air inside the car? Having your air conditioner continue to run after you’ve turned it off is an issue that you’ll more than likely be able to resolve by utilizing the information here. Considering all of the options available, there are a number of ways your thermostat settings can make it appear that your air conditioner is not running correctly. An AC not blowing sometimes is caused by a dirty condenser unit. If the outside unit is running but no air is blowing inside, check that the returns aren't blocked, check that the filter is clean, and if that's not it, it's probably the fan or the blower motor (in my case, about a $500 repair) or the control board. I am having the same problem. Why is my A/C blowing warm air? If this fan fails, there might be a problem with the AC system at lower speeds. (2 to 5 min.) If you notice that your AC is working at higher speeds but not lower, there could definitely be a problem with the condenser fan. When this happens, your system has less air to condition. … Thanks Blower running but no (or little) air coming out. I created this blog because I was tired of finding false information on the web while looking for repair information. Blower still does not work. The AC condenser is often installed in front of the radiator, and this makes it sitting in a very exposed position for stones and other parts that can damage it at high speeds. This kind of thing is usually caused by the resistors for the motor speed control or the thermo cutout opening up. You can replace this clutch in many AC compressors or even remove shims for the clutch for it to work a little bit more. Having your car’s air conditioning go out suddenly can ruin your day fast. A cabin air filter is responsible for filtering the air that enters the vehicle’s air conditioning system. A faulty blower fan can make the car ac stopped working suddenly. If it does not turn on, it is an indication that either the switch itself is malfunctioning or the AC circuit is not getting power. I hope you enjoy my content! If the fan is damaged or cannot run with its full force, it cannot cool down the heat coming from the Freon (refrigerant) through the condenser. Solution: Check your air filter. If the pressure gets too low, it will also shut off the function of the AC compressor. Fixing the AC could be as simple as recharging your car's AC refrigerant or repairing a refrigerant leak but may also require complex electrical climate control repair or slipping compressor clutch to get your air conditioning operating at top performance once again. If there was a short or a surge in the system, the fuse might blow to protect the delicate electronic components from damage -- but in so doing will render the system inoperable until the fuse is replaced. If this clutch is too worn, it may cause the AC compressor not to start at all. 2003 2500 HD with a Diesel. If the motor is making a humming noise or turning very slowly, the capacitor may need to be replaced. Without getting too detailed, a dirty air filter makes it hard for air to enter into your AC system, which means you’ll be feeling low airflow. The filter catches all the dust and impurities that enter the passenger compartment and can, therefore, become clogged over time. A frozen evaporator coil. Automotive … When it is not, which of course occurs on the most brutally hot day of the year, the A/C suddenly becomes a cruel joke, blowing warm, stale air into your vehicle. Anyone ever have the evaporator ice up? Remove the cabinet cover and check that the motor … The condenser is installed in the front of the car, transferring heat away from the evaporator inside the car. Your AC cools air by blowing it over the evaporator coil. Any problem in your car that has to do with air conditioning can be very distressing, especially if you live in a hot country. If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. Your window air conditioner may turn on but not blow cold air because of an issue with the fan motor capacitor. 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. This often causes the AC condenser to start leaking refrigerant, which will cause the AC refrigerant to pour out. Find the filter either behind your return grates (the metal slots in the ceiling where air gets sucked in) or in a slot before the furnace/air handler unit. If your air conditioner is running but not blowing any air and you have inspected the air filter and fan motor and found them okay, then you may have a problem with the control board. If this actuator is faulty, your car might blow hot air out from the vents even if you require cold air. by 06SiLvErAdO_InNY » Oct 20 2011, 1:26am, problem work thing blower same anyone running coming thanks getting start used still think help sierra stock first, Users browsing this forum: No registered users and 9 guests, New here and searched but could not come up with an answer. This makes the AC compressor to spin and power the AC system. My Air Conditioner Keeps Running When Turned Off! If this fails, it may send the wrong signal to the blend door actuator, and this may cause it to blow hot air instead of cold. Does that mean it needs to be replaced. Most older cars have wires for this, but newer cars have an electronic signal between these, which can fail. Tina, Depending on what kind of car you have it is possible that your compressor is ok and that is the standard cycle time. When it comes to your air conditioning system, different parts produce similar results when they start to … Checked for battery at the blower, when the car is running. In case you feel that the air conditioner motor is not functioning, you can be ensured that the air conditioning system will not be blowing cold air. The problem may lie with a broken part. This may not be the correct answer but I get the same problem on my work truck (2005 freightliner) and the problem is that if the a/c is used when temp outside is cool the a/c core or whatever the radiator type thing is under the dash gets frozen over and will not let the air blow through the vents.... Again it might not be correct answer but it's a start.... i'd say that one of your "blend door" actuators is broken. I had a guy come in to my work this problem with a similar situation and it turned out to be an orifice tube or something along those lines. Rotated all the PDC relays around, they have the same ID, other than ABS pump. Thanks. The condenser unit, which is usually located outside, is exposed to dirt, soot, debris, tree branches, twigs, leaves and all types of weather. Its a common reason for air conditioning units not to be blowing as cold of air as you would like. I think I have pinpointed it to a control head. Although you can easily fix it by refilling the refrigerant level, it might happen that the compressor is broken since you did not use it in a long time. Not blowing - New here and searched but could not come up with an answer. The Air condition control unit is often quite expensive, and it is recommended to check the other things first. I have all my speeds and you can hear it running but not getting any thing out any of the vents. So after … There are two AC pressure switches in your car that monitor the high-pressure side and the low-pressure side of the air condition system for safety reasons. Dealer had one in stock. Anyone have any ideas? No mouse nest in the box. RUN light blinks slowly (1.5 sec ON, 0.5 sec OFF) Airflow has stopped to prevent blowing out of cold air until the indoor heat exchanger has warmed up. The AC system should always be leak checked before a refill. Then if i go to vents it is gone. If you feel that there is a meager amount of air blowing through the vents, it could absolutely be a clogged air filter. One potential issue that may cause your air conditioner to run but not blow cold air is a dirty air filter. ANSWER: You’re low on freon If your air conditioner is running properly, you shouldn’t have to replace freon. For this, we need a fan that can run instead of the wind at lower speeds. It does it no matter if you are running heat or A/C. Any degree of blockage in the system can lead to the condenser not being able to execute its principal function. You might not think your filter contributes to your AC not blowing cold air, but it does. If the … Blower still does not work. If this AC pressure is faulty, it can give the AC compressor faulty signals to stop – even if it shouldn’t, and this will cause your AC system not to function at all. For example, your thermostat may say 74 but the temperature won’t get below 80 degrees. Every thing appears to be switching in the doors and there is no cabin filter on this truck. If the outlet and cord are fine, it could be an issue with your electrical panel. Rotated all the unmarked relays around in the junction box. Verify if this light turns on when you reach MAX A/C. The main issues that occur with the car’s air conditioning system are due to poor maintenance. Disconnecting the cycling switch and high pressure switch have no effect. https://www.wikihow.com/Diagnose-a-Non-Working-Air-Conditioning-in-a-Car We … You’ll need an expert to evaluate your system, repair the cause of the leak and restore … Here’s the Fix By Michael Joseph. Have changed the orfice to help get rid of some of the water build up. 2003 2500 HD with a Diesel. It is recommended to check and clean the cabin air filter frequently. If you leak in the AC system, the pressure will get lower and lower and finally stops working at all. You'll want to check the … However, refrigerant leaks can happen over time, and at $75-$100 a pound, you don’t want to wait to find the source of the leak. The most common causes when car AC is not blowing cold air are an empty AC system, faulty air compressor, faulty AC pressure switch, and a clogged cabin filter. #2: Frozen evaporator coil. My compressor turns on and off like every 3 to 5 seconds when the car is running with the air condition on. As you might understand, it won’t pass any wind through it at lower speeds. The most common reasons that AC blows warm air in car are leaks in the air cooling system, broken compressor, worn-out clutch or electrical wiring problems. There are two main issues in the condenser that can lead to a car AC system blowing hot air. Make sure the condenser and its environs are clean; otherwise it will have difficulty accessing air and could lead to the system overheating. Why should I replace my Cabin Air filter. Said he sold 4 this year. BlueDevil Pro says: October 1, 2015 at 3:00 pm. 2005 GMC Sierra 1500 SLE Ext Cab 5.3L 4x4 - SOLD. When it is working properly, your cars' air conditioner is a wonderful thing. These different speeds are usually controlled through a set of resistors or a small computer module which is controlled by the fan switch. Apart from this, the speed of the AC motor will be slower. I have good air circulation when truck is first ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. Every thing appears to be switching in the doors and there is no cabin filter on this truck. I have good air circulation when truck is first started then it goes away. Here is a more detailed list of the most common causes of a car AC not blowing cold air. (HOT KEEP program) Airflow is not blown out for 5 to 15 min. The AC compressor pumps refrigerant around in the AC system for it to cool properly. This setup can look a little bit different, but the main function is the same. Still have same problem. The cooling fan in the condenser is the first thing that you should look into while finding out the reason for car air conditioner not blowing cold air when idling. As the capacitor, present in the fan motor of the air conditioning system gets weak; it will be reducing the speed of the blower. The Meaning of My AC Running but Not Blowing Air In addition, if your return vents were sized too small for your house’s air circulation requirements, that would likewise create low airflow. I have all my speeds and you can hear it running but not getting any thing out any of the vents. Checked continuity of 40 amp blower fuse; it's okay. The AC system is also leaking very slowly through hoses and other places. This part aids the fan motor in circulating cold air. The blower motor resistor or blower … The main issues that occur with the car’s air conditioning system are due to poor maintenance. Anyone ever have the evaporator ice up? The most common causes of broken air conditioning are leaks or compressor issues. The first thing to check with any issue related to the car's climate control or electronics is the fuse box. This part is called the blend door actuator inside your car, and it is controlling a flap that is redirecting hot or cold air inside of your car. The condenser needs wind through it to remove the heat properly. Air conditioners require large surges of power, and your unit might have blown a fuse or tripped a breaker. No mouse nest in the box. Believe it or not, something as simple as a dirty filter could be what’s causing your air conditioner not to blow hard. The task of cleaning a … Step 2: Verify that air is blowing. Most newer cars have a variable AC compressor, though, and in this case, no AC compressor clutch can fail. But you say you hear the blower working when running it at a reduced speed and just don’t get any air. Most vehicles today have one multi-speed fan that blows air through a series of ducts and vents based on the driver’s selection in their climate control system. If you haven’t refilled it in 6-7 years, it is definitely time for a refill, and if it was more recently you filled it, it is time to check for any leaks. basicly your a/c system should unlock the compressor clutch when the temp reaches certain points. It happens that the pump fails and stops pumping at all, and this will cause your AC system to blow hot air. The first is a blockage anywhere in the series of tubes in the condenser. Learn more: Has Your Air Conditioner’s Air Filter Betrayed You? Here is a more detailed list of the most common causes of a car AC not blowing cold air. Now, imagine that your car’s air conditioning system suddenly stops blowing cold air; how would you feel? Have replaced the actuators, and the main controller. The power output from the relays can be checked with a multi-meter, but this should only be attempted by a qualified person. Imagine driving peacefully on a bright sunny morning, listening to your favorite music, and enjoying the scenery around you. Sometimes referred to as the PCB, this is an electronic control board that operates the fan motor and compressor circuits using relays mounted on the circuit board. Absolutely desperate, of course! This means that you won’t only notice a lack of cold air, but probably a little more dust and an overall stuffiness. Hi, I’m Magnus, the owner and the writer of Mechanic Base. Hot liquid refrigerant stays hot. If I turn off the a/c it will not freeze up. we covered that in class the other day. Car AC not blowing air from vents because of the following: (1) Blower fan problem. 06silverado_inny, you have a temp sensor problem. Air condition is blowing hot air now. The serpentine belt powers the air compressor pulley, and when you activate the AC – the clutch is connecting the air compressor to the pulley. This is very slow, though, and you can expect to refill it every 6-7 years. Dust and debris collects and builds up within the filter which blocks air from coming through. by Magnus SellénUpdated: February 8, 2021. Some car compressors use a clutch inside the air compressor. A dirty air filter could also freeze your evaporator coil. You do often have to replace the AC condenser at least every 10 years. It can be cleaned out to help resolve the problem. If you haven’t been regularly checking and changing your air filter, it’s most likely extremely clogged. Your system’s air filter traps dust, dirt and other airborne pollutants to keep indoor air and internal cooling system components cleaner. Problem #2: Frozen evaporator coil. It is possible that there is dirt or moisture that has built up in your car’s air conditioning unit. If the AC compressor fails, you often have to flush the whole AC system afterward because there might be metal pieces everywhere. You don’t need to tolerate a stuffy, uncomfortable car … If your filter is dirty, it should promptly be replaced. For the AC system to work properly, it needs this pressure and a specific amount of refrigerant. Another common and easily remedied situation that sometimes results in a central air conditioner fan not working is a dirty, clogged air filter. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule a service ASAP to maximize your comfort. There are a variety of reasons why your car AC is not blowing cold air. Your AC system is filled with an ac refrigerant, making sure the whole system is working correctly. If it’s dirty, replace it. It might sound basic but if your AC is not blowing air, check to ensure that it’s plugged into the outlet correctly, and that the power cord is still intact. 9. Only let a certified workshop with the proper equipment do work to your AC system. Car AC Not Blowing or Is Your Car AC Fan Not Working? Blower running but no (or little) air coming out, Re: Blower running but no (or little) air coming out, Blower not working at all and floor is wet under blower. There could not only be damages to the AC compressor clutch; the compressor itself can also fail if you are unlucky. nbs99 z71 325ci v8, stock 4wheel disc brakes, no cats, flow master classic 40 series, rhino line, custom fog lights, cb, bully dog tunner, 4:10 locker, airbag load leveling, 205,000miles. Vents seem to work good until i select defrost and then the flow goes away. The air filter strains particles from the indoor air supply but when it fills to capacity, less air passes through. This obstruction in the running of condensing unit can be due to easy reason like tripping of circuit breaker and complicated like its bad condition. Airflow is not blown out when starting the HEATING opera- tion. It is like it freezes up after running above 55 MPH for about 35 minutes. Close your window coverings to continue to keep your home from heating too much as you’re gone. Reply. The most common causes when car AC is not blowing cold air are an empty AC system, faulty air compressor, faulty AC pressure switch, and a clogged cabin filter. Its a 2001 GMC sierra 1500 HD crew 4x4. I have been working with cars for 10 years, specialized in diagnostics and troubleshooting. Also, a clogged cabin air filter leads to a deterioration in the air conditioning system’s cooling. A clogged filter will restrict air flow into your home. It does sound a little … Each of these problems has its own … 2Remove the door on the front part of the air-handler cabinet so that you can … Improper running of condensing unit: The condensing unit in your aircon works to compress the refrigerants into its coil to keep the system cool but if it stops running smoothly then you may find your aircon blowing warm air. it switches form hot to cold but just not enough air flow to to any thing. 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