All of these are fairly easy to check. You have two options. In order for the AC Condensor to do its job it must stay as cool as it can. If you suspect a faulty run capacitor is the cause of your air conditioner fan not working, contact a professional HVAC service tech. The power to the A/C unit must be shut down before opening the A radiator fan is not very expensive and can cost around $200 – $400. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. Here is the start of the problem: Friday works fine went to bed got up Saturday house is 84 degrees, always keep thermostat at 74 year round. In either case, a bad When this happens, your air conditioner fan will quit spinning. A layer of grime on the fan blades can also slow it down, so again you may just need a good cleaning. Allowing the fan to run uninterrupted, there is a more even distribution of warm or cool air circulating through your home. Note, there is no burnt or corroded wiring. This is especially true for air conditioners that are not properly maintained. Don’t risk a costly fan motor or compressor repair by putting off a simple capacitor replacement! Lack of maintenance. The Fan Won't Start on My Outside AC Unit. Capacitors send an electrical jolt to start Radiator Fan Cost. the unit. The relay board provides voltage to many components of the air conditioner, including the fan motor. I turned off the AC and left it … This will be a set of contacts that are normally open. Step 4: Inspect the condition of the capacitor. Locate the fan relay. If you have difficulty getting the blades to turn, there may be That said, if you're able to obtain a high-quality manual, it will pay for itself several times over in guidance. kick-starting the fan by pushing the blades. correctly. When the ac compressor not working but the fan is running, chances are the outer unit housing the compressor isn’t receiving power. It involves dealing with high In the Wichita area, give us a call at (316) 462-2572 for If the fan blades are turned manually then the motor will spin and the rotor will come up to speed. a motor (a “start capacitor”) or to keep one running (a “run dangerous electric shocks if there is still electric current flowing to So, either something else is involved in determining if the fan should run, or there's something else wrong. If both the compressor and the fan motor won’t run, use a multimeter to test the temperature control thermostat for continuity. All rights reserved. When this happens, your air conditioner fan will quit spinning. Trouble with the bearing will also result in wobbly or lopsided turning if the fan does run. This shows you how to troubleshoot and fix a heat pump or AC unit that is not working. However, it is prone to different kinds of problems. The bearings of the motor may need cleaning. If your AC indoor fan isn’t working, first check to make sure a breaker hasn’t been tripped. If you do need to clean the motor bearings, do this carefully so as not to damage the internal workings of the unit. He then replaced the fan motor but that has not solved the problem. Similarly, if a fan won’t turn when the power is on but will rotate freely when shut off it could be the sign of a bad motor bearing. Car AC Not Blowing or Is Your Car AC Fan Not Working? Slide a long, thin wooden stick through the fan grate and gently push one of the blades to try to get the fan spinning. The relay board provides voltage to many components of the air conditioner, including the fan motor. You took over its job of motor. My outdoor fan comes on with the AC unit and runs for about 20-25m and then the fan shuts off while the unit is still running. Inside the condenser is the primary motor control. The motor was getting very hot and would shutdown after about 30 mins. But a climate control system with no fan to push the air around is anything but controlled. If the fan takes off and then keeps going on its own, you more than So, if the capacitor attached to your fan motor is bad, the You risk My air conditioner outside fan is not running. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. If the thermostat is not calling for cooling, there will be no voltage present. He said if the fan's not on it won't work as it should. If the relay board isn’t working properly, the fan might not run. When the ac compressor not working but the fan is running, chances are the outer unit housing the compressor isn’t receiving power. If all is OK, check your air filter. Step 3: Find the start capacitor for the fan. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly. If your car’s AC isn’t blowing air, it could be a problem with your car’s fan. Measure the resistance between each lead wire with a multimeter or VOM. The trouble relates to the blower motor and its activation. I've changed the capacitor and the fan and it still is not running. It’s the fan motor that makes the radiator expensive. Checked continuity of 40 amp blower fuse; it's okay. Safety note: This method requires that you shut off the power This heavy use results in a significant amount of wear and tear, and eventually, the motor will give out. Disposing of a capacitor As long as the capacitor is running, the motor also runs. We'll diagnose your unit and provide a fair quote for the air conditioning repair. Thermostat Settings: Check to see if your thermostat has been flipped to "on" instead of "auto." Fan Won’t Stop. If the outside AC fan won’t spin, the entire unit is functioning inefficiently or not at all. NOT proceed if you’re not sure you’ve properly shut off the power. This can also be tied to a bad capacitor since Start Run capacitors are used to start the condensing fan motor. The hot electrical smell can be noticed on condenser motors just by standing over the unit when is running. 6 ways to tell if you air conditioner fan motor might be bad. the top gets very hot when its trying to run, and its making a humming noise, but no fan movement. completely. voltage, and there is a risk for serious or even deadly electric shock So far, our highest temps have been 85-90 deg. The best repair manual is always a factory manual, but these can either be hard to find or many times more expensive than a "consumer friendly" repair manual. A burned-out motor might be causing your air condition fan to not work Overtime, the motor in your air conditioner goes through the basic wear and tear and will eventually burn out. The fan keeps running because the central unit has no such problem. They can also suffer damage from high temperatures or high voltage. that hasn’t been discharged can even cause a fire. fan was not running and the unit was extremely hot as if something were burning.? This is called a “dual capacitor” and has Common Reasons Your AC Fan Is Not Spinning Start Capacitor Breakdown. service panel, and the capacitor itself discharged of stored energy Rotated all the PDC relays around, they have the same ID, other than ABS pump. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as fuses and relays. Condenser Fan Run But Not The Compressor Motor by: Mel It has been very hot in S.E Michigan the last few months Central air unit working fine all along cools nicely. the same time will cause an electric shock. fan’s not spinning. Scorching outdoor temps plus the heat of the motor can overwhelm a capacitor and cause it to fail. The ECU signals the radiator fan to work at the precise time. If the capacitor is bad, the start winding will not be energized and the motor will not turn. If there is an air conditioner, remove the screws to the control panel and pull it off. If the coil froze, the fan could be working but the air wont go through the ice until it melts. First make sure there is power to the indoor unit and that a switch or breaker isn't off. With the engine running and the A/C turned on, check for power getting to the low or high power wires to the cooling fan motor. One of the simplest explanations for an AC fan not spinning is a dead fan motor. Inspect the capacitor. Relay boards are often misdiagnosed; before replacing the board, make sure you check more commonly defective parts—particularly the fan motor capacitor and the fan motor itself. Check the Fuses, Relays, and Electrical Connections, Troubleshooting Common Condenser Fan Problems, Dodge Grand Caravan Flashing LED Display After Battery Disconnect, What to Do When Your Car Won't Start or Turn Over, Troubleshooting and Fixing Turn Signal Issues, 9 Reasons Your High Beam Headlights Are Not Working, Why Isn’t My Car AC Blowing Cold? Most fan motors work overtime, especially during the summer months. Can you help? Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. The outdoor compressor was making noise but the motor and fan were not running and it felt very hot to the touch. The outdoor fan stopped running. debris wrapped around the fan axle, or the motor bearings may be dirty It needs that extra boost from a start This is a quick and simple repair for a professional. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. Again, if neither of those troubleshooting efforts locates the problem, call for professional help for AC window unit repair . My fan is not running on the outside ac unit. Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. You can think of the motor on a fan just like the motor in your car. The Haynes manual says the blower is activated by a relay. It is a magnetized switch that turns on and off with signals sent by the thermostat. The fan motor outside gets really hot, but does not run. We do our best to provide current and accurate information, but this content could contain errors or information that is not correct for your situation or equipment. 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. Basically the fan motor will run for 30 - 40 mins and then shutdown. If the compressor isn’t starting, check the wiring connecting the two units. Run capacitor is weak or has failed. Relay boards are often misdiagnosed; before replacing the board, make sure you check more commonly defective parts—particularly the fan motor capacitor and the fan motor itself. NOT touch the capacitor terminals or any leaking fluid. I work in the telephone business and am very familiar with DC wiring. Yesterday afternoon (temps in high 90's for several days)I lost air conditioning again. If the fan doesn’t start running, you may have a bad fan motor. NOISY electric motor A bad capacitor is a common A/C problem with a straightforward before it can be removed. DO It's free turning when I turn it with a screwdriver (not bound). Posted on January 25, 2018 February 11, 2020 by Steve Arnold — 18 Comments Top 10 Reasons Why the Blower Fan Motor will not come on. 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