The task of cleaning a … Your AC cools air by blowing it over the evaporator coil. Your window air conditioner may turn on but not blow cold air because of an issue with the fan motor capacitor. 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 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. Apart from this, the speed of the AC motor will be slower. Here is a more detailed list of the most common causes of a car AC not blowing cold air. 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. There are two main issues in the condenser that can lead to a car AC system blowing hot air. 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. 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. Checked continuity of 40 amp blower fuse; it's okay. The main issues that occur with the car’s air conditioning system are due to poor maintenance. Does that mean it needs to be replaced. Now, imagine that your car’s air conditioning system suddenly stops blowing cold air; how would you feel? These different speeds are usually controlled through a set of resistors or a small computer module which is controlled by the fan switch. These parts are located within the air conditioner cabinet. Rotated all the PDC relays around, they have the same ID, other than ABS pump. 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. If you want to know more, you can read our article Why should I replace my Cabin Air filter. Learn more: Has Your Air Conditioner’s Air Filter Betrayed You? Car AC Not Blowing Cold Air: A Bad Fuse. A cabin air filter is responsible for filtering the air that enters the vehicle’s air conditioning system. It can be cleaned out to help resolve the problem. Most newer cars have a variable AC compressor, though, and in this case, no AC compressor clutch can fail. 9. The condenser unit, which is usually located outside, is exposed to dirt, soot, debris, tree branches, twigs, leaves and all types of weather. Some car compressors use a clutch inside the air compressor. Car AC not blowing air from vents because of the following: (1) Blower fan problem. The serpentine belt powers the air compressor pulley, and when you activate the AC – the clutch is connecting the air compressor to the pulley. Each of these problems has its own … An AC not blowing sometimes is caused by a dirty condenser unit. The Air condition control unit is often quite expensive, and it is recommended to check the other things first. 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. The power output from the relays can be checked with a multi-meter, but this should only be attempted by a qualified person. #2: Frozen evaporator coil. If you notice that your AC is working at higher speeds but not lower, there could definitely be a problem with the condenser fan. Checked for battery at the blower, when the car is running. You can replace this clutch in many AC compressors or even remove shims for the clutch for it to work a little bit more. There are a variety of reasons why your car AC is not blowing cold air. 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. Not blowing - New here and searched but could not come up with an answer. 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. This setup can look a little bit different, but the main function is the same. Thanks Blower running but no (or little) air coming out. 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. For this, we need a fan that can run instead of the wind at lower speeds. When it comes to your air conditioning system, different parts produce similar results when they start to … Dust and debris collects and builds up within the filter which blocks air from coming through. If you leak in the AC system, the pressure will get lower and lower and finally stops working at all. No mouse nest in the box. Blower still does not work. Your car mechanic can utilize special car AC repair tools and diagnostics to determine whether or not your vehicle is running short of refrigerant. 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. I created this blog because I was tired of finding false information on the web while looking for repair information. This means that you won’t only notice a lack of cold air, but probably a little more dust and an overall stuffiness. You'll want to check the … Dealership is at a loss. It does it no matter if you are running heat or A/C. Its a common reason for air conditioning units not to be blowing as cold of air as you would like. 2003 2500 HD with a Diesel. If it’s dirty, replace it. 06silverado_inny, you have a temp sensor problem. 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. This makes the AC compressor to spin and power the AC system. I hope you enjoy my content! This refrigerant system is of high pressure, and it can reach 15 bars when the car is running. The last cause on this list is a faulty heat controller. Imagine driving peacefully on a bright sunny morning, listening to your favorite music, and enjoying the scenery around you. One potential issue that may cause your air conditioner to run but not blow cold air is a dirty air filter. Blower still does not work. This is very slow, though, and you can expect to refill it every 6-7 years. If your filter is dirty, it should promptly be replaced. 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. Hot liquid refrigerant stays hot. 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. If the AC compressor fails, you often have to flush the whole AC system afterward because there might be metal pieces everywhere. No mouse nest in the box. 2005 GMC Sierra 1500 SLE Ext Cab 5.3L 4x4 - SOLD. A frozen evaporator coil. The blower motor resistor or blower … It is recommended to check and clean the cabin air filter frequently. If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. Most older cars have wires for this, but newer cars have an electronic signal between these, which can fail. Reply. Remove the cabinet cover and check that the motor … When it is working properly, your cars' air conditioner is a wonderful thing. I have all my speeds and you can hear it running but not getting any thing out any of the vents. A dirty air filter could also freeze your evaporator coil. This kind of thing is usually caused by the resistors for the motor speed control or the thermo cutout opening up. 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. So after … Any problem in your car that has to do with air conditioning can be very distressing, especially if you live in a hot country. Believe it or not, something as simple as a dirty filter could be what’s causing your air conditioner not to blow hard. Your AC system is filled with an ac refrigerant, making sure the whole system is working correctly. It is possible that there is dirt or moisture that has built up in your car’s air conditioning unit. Have changed the orfice to help get rid of some of the water build up. If this actuator is faulty, your car might blow hot air out from the vents even if you require cold air. The AC compressor pumps refrigerant around in the AC system for it to cool properly. For example, your thermostat may say 74 but the temperature won’t get below 80 degrees. basicly your a/c system should unlock the compressor clutch when the temp reaches certain points. When you turn the heat controller on the AC control unit, there needs to be something that controls the heat 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. Why is my A/C blowing warm air? Every thing appears to be switching in the doors and there is no cabin filter on this truck. … There is no battery to operate the blower. The condenser is installed in the front of the car, transferring heat away from the evaporator inside the car. The filter catches all the dust and impurities that enter the passenger compartment and can, therefore, become clogged over time. The main issues that occur with the car’s air conditioning system are due to poor maintenance. This often causes the AC condenser to start leaking refrigerant, which will cause the AC refrigerant to pour out. 2Remove the door on the front part of the air-handler cabinet so that you can … Every thing appears to be switching in the doors and there is no cabin filter on this truck. Dealer had one in stock. Here is a more detailed list of the most common causes of a car AC not blowing cold air. If that is really true then the trouble would have to be with the vent doors somehow, it would seem to me. This can easily be fixed by checking the air filter and changing it if it is dirty. (HOT KEEP program) Airflow is not blown out for 5 to 15 min. Absolutely desperate, of course! 2003 2500 HD with a Diesel. 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. It is like it freezes up after running above 55 MPH for about 35 minutes. My compressor turns on and off like every 3 to 5 seconds when the car is running with the air condition on. Then if i go to vents it is gone. 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. The first thing to check with any issue related to the car's climate control or electronics is the fuse box. If this clutch is too worn, it may cause the AC compressor not to start at all. When the car ac is not blowing air from vents it is a sign of a faulty blower fan or air duct blockage. Solution: Check your air filter. 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. As the capacitor, present in the fan motor of the air conditioning system gets weak; it will be reducing the speed of the blower. 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. If the … 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. If you haven’t been regularly checking and changing your air filter, it’s most likely extremely clogged. 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. 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 the motor is making a humming noise or turning very slowly, the capacitor may need to be replaced. Still have same problem. If this fan fails, there might be a problem with the AC system at lower speeds. 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. If the pressure gets too low, it will also shut off the function of the AC compressor. 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. Air condition is blowing hot air now. 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. A clogged filter will restrict air flow into your home. The most common causes of broken air conditioning are leaks or compressor issues. The AC button has a light on the button that illuminates when the air conditioner is turned on. Hi, I’m Magnus, the owner and the writer of Mechanic Base. The problem may lie with a broken part. Anyone ever have the evaporator ice up? 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. But you say you hear the blower working when running it at a reduced speed and just don’t get any air. It does sound a little … If I turn off the a/c it will not freeze up. Here’s the Fix By Michael Joseph. I have good air circulation when truck is first started then it goes away. Anyone have any ideas? 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. Vents seem to work good until i select defrost and then the flow goes away. ANSWER: You’re low on freon If your air conditioner is running properly, you shouldn’t have to replace freon. 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. There could not only be damages to the AC compressor clutch; the compressor itself can also fail if you are unlucky. If you feel that there is a meager amount of air blowing through the vents, it could absolutely be a clogged air filter. Step 2: Verify that air is blowing. Air conditioners require large surges of power, and your unit might have blown a fuse or tripped a breaker. We … it switches form hot to cold but just not enough air flow to to any thing. I think I have pinpointed it to a control head. Also, a clogged cabin air filter leads to a deterioration in the air conditioning system’s cooling. My Air Conditioner Keeps Running When Turned Off! When this happens, your system has less air to condition. You might not think your filter contributes to your AC not blowing cold air, but it does. It happens that the pump fails and stops pumping at all, and this will cause your AC system to blow hot air. 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. 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. The first is a blockage anywhere in the series of tubes in the condenser. Your system’s air filter traps dust, dirt and other airborne pollutants to keep indoor air and internal cooling system components cleaner. 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. If the pressure gets too high – it will stop the AC compressor from cooling the system anymore because of safety reasons. Anyone ever have the evaporator ice up? 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. Have replaced the actuators, and the main controller. For the AC system to work properly, it needs this pressure and a specific amount of refrigerant. So why is blowing warm air inside the car? Another common and easily remedied situation that sometimes results in a central air conditioner fan not working is a dirty, clogged air filter. (2 to 5 min.) 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. Said he sold 4 this year. we covered that in class the other day. Having your car’s air conditioning go out suddenly can ruin your day fast. The AC system should always be leak checked before a refill. Only let a certified workshop with the proper equipment do work to your AC system. As you might understand, it won’t pass any wind through it at lower speeds. If the outlet and cord are fine, it could be an issue with your electrical panel. This part aids the fan motor in circulating cold air. Rotated all the unmarked relays around in the junction box. Why should I replace my Cabin Air filter. Automotive … Thanks. The condenser needs wind through it to remove the heat properly. by Magnus SellénUpdated: February 8, 2021. 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. You don’t need to tolerate a stuffy, uncomfortable car … Car AC Not Blowing or Is Your Car AC Fan Not Working? Tina, Depending on what kind of car you have it is possible that your compressor is ok and that is the standard cycle time. A faulty blower fan can make the car ac stopped working suddenly. You do often have to replace the AC condenser at least every 10 years. The AC system is also leaking very slowly through hoses and other places. Close your window coverings to continue to keep your home from heating too much as you’re gone. it switches form hot to cold but just not enough air flow to to any thing. 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. Problem #2: Frozen evaporator coil. Any degree of blockage in the system can lead to the condenser not being able to execute its principal function. Its a 2001 GMC sierra 1500 HD crew 4x4. 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. I have all my speeds and you can hear it running but not getting any thing out any of the vents. Airflow is not blown out when starting the HEATING opera- tion. Disconnecting the cycling switch and high pressure switch have no effect. You’ll need an expert to evaluate your system, repair the cause of the leak and restore … 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. The air filter strains particles from the indoor air supply but when it fills to capacity, less air passes through. I am having the same problem. 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. I have good air circulation when truck is first ... - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. Verify if this light turns on when you reach MAX A/C. BlueDevil Pro says: October 1, 2015 at 3:00 pm. I have been working with cars for 10 years, specialized in diagnostics and troubleshooting. Make sure the condenser and its environs are clean; otherwise it will have difficulty accessing air and could lead to the system overheating.