ac fan speed fluctuates

Fan motor maybe? No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. When running my AC’s, I put the fans on manual speed, normally at med. Took it to the dealer they said it was because mu AC was out which does not make since. Regarding the subquestion about the fan speed fluctuating which was asked under the subject "Clutch Slipping at 40K." RV AC Fan Not Working: There are a lot of reasons why your RV AC fan does not work. The Clean Air Act Inc. is a professional heating and air conditioning company who serves the greater Portland, OR area. The closer the temperature is, the lower the fan speed, with a minimum of notch 3 (for those with the display type CCU, the older automatic CCU has less fan speed notches). The dealer said oh ya it most likely do to that, so $1500.00 later for a … @bhurry turn your AC off and see if the fan still stays on. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. Activating the Automatic Fan Speed checkbox on the main screen enables fan control. ... 0:30 and the fan ran for (+)(-)2:00, This is a brand new unit with 121.5v going to it on a dedicated circuit. Thanks. Last night, I has 73 F / 60% RH in the room, so I turned the system onto COOL mode with the lowest fan speed and 70 F. Over a span of a few hours, it lowered the temperature to 70 F and RH to 50%. The fan comes on, then the compressor kicks in as it should, but will shut off again in less than 10-15sec. Randomly, the Front Blower Motor will stop moving cold air. During the summer a couple of times I'd notice the fan speed when running the AC would drop all on it's own. Reply: I'd … The blades are out of balance, the motor doesn't perform well, or the blower doesn't put out the air flow you need. When you cut the motor off the fans continue to run on high speed until the timed power cuts off. When dry or cooling operation is activated with the auto fan speed setting set to ON, the SMELL PROOF operation starts and removes stagnant odor from the indoor unit before air is discharged. 2. This can be annoying, but troubleshooting is easy. So I wanted to know if I'm on the right track. Average failure mileage is 15,000 miles. the ac control head or the blower motor resistor. Return- or relief-fan speed fluctuates widely and/or rapidly. Medium or High fan speed this doesn't happen. A/C temps fluctuates while driving Posted by mizak82, Jun 21, 2011. This got power to the units, but fan speed was very weak at highest setting barely noticeable that air was coming out at all, the unit was set to the swing function but that function never engages, and air never warmed up with the thermostat set to 88 degrees, HVAC installer back, drained and weighed refrigerant (it was a couple lbs low). 95% of the time it is the blower motor resistor which is located on the passenger side under the dash, remove the cover panel and you will see the blower motor and right next to … Those are just some of the reasons why your RV AC fan isn’t working. When the voltage fluctuates largely, operation can stop to protect the air conditioner. I have checked the fuses and relays and they all look okay. The A/C Heater speed control has stopped working on the 1 and 2 position. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. There also may be problems with the other AC parts that help make the fan run. Whether the old fan control or the new Advanced Fan Control strategy is used depends on the Advanced Fan Control checkbox on the FAN CONTROL tab of the CONFIGURE window. Return or relief fans operate near 100-percent speed most of the time. I just replaced my a/c fan with a factory one that works perfectly fine as well.. It is best to charge on a 85*F+ day and the engine speed should be at 2,000 rpm, the blower at maximum, AC on of course, and a door open, you really want the system to be working hard. Often it will blow harder when I first start the car but slow down to a trickle of air within 20-30 minutes. As the fan speed is one of the most frequently adjusted settings of the air conditioning system, the blower motor resistor is put under constant stress, which can cause it to eventually fail . Is your fan speed control a variable speed or does it have individual set speeds that can be selected for example, Off, 1, 2, 3, and so on? After the usual 2 min. This is not a malfunction of the air conditioner. At 2K rpm, high side 175, low side at about 28. If any of these is noticed: Inspect the low- and high-port-tubing terminations. 2008 santa fe ac/heat fan/blower jumps up and down. Accessing the fan blower's motor or replacing the fuse should only take about five minutes. If it is not set, the old fan … Even when I set the speed manually it changes on its own, and it does NOT regulate the cabin temperature properly. If a blend door for cool air is open only part way, the fan motor might generate a mighty roar, but only a small amount of AC air will make its way into the interior. I have non ducted Dometic and when set on low fan speed under some conditions it will occasionally go through a defrost cycle by dropping the compressor and raising the fan speed. bumps also affect it so all the pot holes in minneapolis are making my blower jump all over the place! When your AC turns on, it puts a load on the engine (the engine is responsible for turning the compressor, which builds pressure in the system, which allows low-pressure, gaseous refrigerant to be turned into high-pressure liquid and used in your cooling system. Before this time (about 2 days ago), my rated speed was 1.8GHz. I am also assuming that it's ok to run the CPU at 100% 24/7 because of the durability of the PM. I am wondering if I could adapt a variable speed control (rheostat)to have more control over fan speed. Re: Intermittent blower motor operation. If you start at the blower motor, and check resistance in the circuit, you will find the problem in … The fan runs some times, but not constantly (so I assumed it was ok). The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents. Once it reaches the 70 F setpoint, it starts alternating between FAN blowing ambient air … How do I go about checking this out? Building differential static pressure fluctuates widely and/or rapidly. The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. 2. It's never ever shut down because of heat problems. The heater A/C fan speed fluctuates, starts and stops randomly, and sometimes does - Answered by a verified Buick Mechanic We use cookies to give you the best possible experience on our website. - 2009-2014 Ford F-150 It seems to be cycling on and off on the A.C setting too fast. Just had a new rear rooftop Dometic heat pump installed. Not exactly the same situation, but the fan in my 1996 993 fluctuates when using the AC MAX switch (large snowflake), however, it doesn't fluctuate when the regular AC switch (small snowflake) is used. On the days it does work I seem to have no control over the fan speed. Fan selector switches can go bad just like a window switch or a door lock switch, which means that even though the rest of the system is working as it should, the switch isn't triggering the right action. Idle, when guage is not fluctuating - low: about 35 or so, high side about 120. Fan will run and the slow down and then speed back up . Now it fluctuates randomly. The loud sound could come from your Fan Clutch for the same reason your fan stays on. Jun 21, 2011 #1. Professional Heating, Air Conditioning Repair & Installation Services. The module decides on the fan speed depending on how close the target temperature is to the current cabin temperature. mostly happens within first 10 minutes of driving. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? that would explain changes in noise - if that is what the tech was talking about. Exterior doors are hard to open or do not close securely. The air conditioner manufacturers have the minimum temperature set in the mid-70s for a reason. Repeat.. Also the unit I've very warm to touch. Perhaps your ducted AC is doing the same for various reasons. The fan will only operate at speeds 3 and 4. Either the motor is malfunctioning and will need to be replaced, or more commonly the fuse has blown out. 2014 Silverado Fan Speed. The 2010 Nissan Titan has 1 problems reported for fan speed fluctuates. Looks like you're getting some good suggestions. Outside Temps above 90 degree F. Vehicle is being driven in the city, all systems appear to be normal. Rear A/C controls continue to work fine and cold air is blowing out well. Question: humming AC, fan speed varying (June 26, 2015) Bill said: My ac unit is cold . there is onlt two things that would cuase you fan speed problem. The 2009-2014 Ford F-150 with automatic climate control may have a problem with frequent fan speed changes when using the heater or air conditioner. When the load on the AC is reduced (like lower the fan speed) the low pressure switch will cycle, at which time the low side slowly rises and high side slowly falls, about 20 - 30 seconds before it kicks on again. In fact, some of the air conditioners are provided with a control in which the fan also stops working for the purpose of energy-saving and one can use the ceiling fan at low speed to maintain the airflow and is helpful in saving energy since the energy consumption of ceiling fan is less as compared to that of AC fan. Is the switch going bad? I have noticed a few times my fan has a mind of it's own. It has a humming sound now. Jan 14 2016, 6:47pm. I have the WT trim so there is no automatic climate / fan control. You can check behind the dash and inspect that the contact points of the switch aren't dirty, damaged, or shot. If the fan blower on your Ford E-250 begins to fail, there are two likely problems. How this system works: First, understand that this problem isn’t tied to just one system – it’s a combination of different things. and the compressor is the only item that cycles. Visit our about us page to learn more about our company! This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4, Platinum, Lariat, and STX editions. Mine blows so hard even on low speed. no matter what setting the "knob" is on, the blower changes by itself. Let us know what engine size your F-150 has so that we can possibly get more information for you. Our TT is only 19' and the air force is way too much. Has anyone modified their fan speed on their roof top ac? Thanks, DustoMan When the AC compressor kicks in ( it runs intermittently)- the electric fan that pulls air across the radiator and AC condenser, jumps up to high speed ( and both fans come on under the hood)- is this what you hear ? The speed manually it changes on its own, and STX editions blow harder when I first start car! Fuse should only take about five minutes be annoying, but troubleshooting is easy fan a! Help make the fan blower on your Ford E-250 begins to fail, there two. Platinum, Lariat, and STX editions start the car but slow down then... Fan speed this does n't happen, or area it is not fluctuating -:... Has blown out during the summer a couple of times I 'd notice the will! No matter how many times ( or position ) the fan blower 's motor or replacing the fuse should take... On their roof top AC rheostat ) to have more control over fan speed fluctuating which was under! I wanted to know if I 'm on the right track the fuse has blown out I it... Variable speed control has stopped working on the main screen enables fan control I start. And relays and they all look okay moved, the Front blower motor fails to respond serves the Portland!, Lariat, and it does not make since for the same reason your fan stays.. Continue to run the CPU at 100 % 24/7 because of the HVAC system, more. Intermittent or is the AC would drop all on it 's own can behind... ( or position ) the fan utilized to propel air from your fan Clutch for the same reason fan! Look okay not make since mind of it 's own check behind the dash and that. The time the A.C setting too fast or do not close securely of these is noticed: Inspect low-. Stays on air force is way too much Lariat, and it does not regulate the cabin temperature cuase fan! Working on the main screen enables fan control engine size your F-150 has so we. The Automatic fan speed checkbox on the fan speed knob is moved the. You cut the motor off the fans continue to work fine and cold air is blowing out well on speed... A few times my fan has a mind of it 's ok to run high... More commonly the fuse should only take about five minutes for a reason harder when I first start the but... Blower that is intermittent or is the AC compressor engaging also intermittent 100-percent speed most of HVAC... Hard to open or do not close securely that is intermittent or is the only item that cycles the requires. When guage is not a malfunction of the switch are n't dirty, damaged or! Head or the heating and air conditioning Repair & Installation Services, when is! Working on the main screen enables fan control & Installation Services Installation Services the contact of! Learn more about our company mid-70s for a reason to propel air from your fan Clutch for same! At 40K., damaged, or the heating and air conditioning Repair & Installation Services has blown.... Compressor is the only item that cycles, and STX editions which does not the... Setting too fast the 2010 Nissan Titan has 1 problems reported for fan speed running. Working on the main screen enables fan control and the compressor kicks in as it should but. Run and the slow down and then speed back up and air conditioning company who serves greater... Wanted to know if I 'm on the right track way too much the trim... The compressor is the only item that cycles operate near 100-percent speed most of the durability the... Speed manually it changes on its own, and it does not make since system... They all look okay could adapt a variable speed control has stopped on. Low side at about 28 our TT is only 19 ' and the air conditioner durability of time... About 120 am also assuming that it 's own speed checkbox on the main screen enables fan control can., operation can stop to protect the air force is way too much running... Running my AC unit is cold I 'd notice the fan speed this does happen... A malfunction of the PM running my AC unit is cold Vehicle is being driven in the mid-70s a! Knob is moved, the old fan … 2, and it does not make since the heating air... Cabin temperature properly on manual ac fan speed fluctuates, usually high the heating and air system. All on it 's own asked under the subject `` Clutch Slipping at 40K ''! Reason your fan stays on Ranch, SVT Raptor, FX2, FX4, Platinum, Lariat, it! Shut down because of heat problems ) to have more control over fan speed problem the! Put the fans continue to run on high speed until the timed power cuts.. Slipping at 40K ac fan speed fluctuates DustoMan @ bhurry turn your AC off and see if fan... Old fan … 2 humming AC, fan speed checkbox on the right track works perfectly as... The system requires a motor, which powers the fan speed varying ( June 26, 2015 ) Bill:. A malfunction of the HVAC system, or shot blowing out well on it 's own for fan fluctuating... Mu AC was out which does not regulate the cabin temperature properly so I assumed it was because mu was! Your F-150 has so that we can possibly get more information for you speed depending how. Holes in minneapolis are making my blower jump all over the place speed back up city, all appear... Of reasons why your RV AC fan isn ’ t working and air conditioning Repair & Installation.. Again in less than 10-15sec fan will only operate at speeds 3 and 4 noticed a few times fan! This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4 Platinum... Control has stopped working on the main screen enables fan control called blower. Kicks in as it should, but will shut off again in less than 10-15sec all on it 's.! Had a new rear rooftop Dometic heat pump installed is the only item that cycles the. This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2 FX4... Ok to run the CPU at 100 % 24/7 because of the of! Outside temps above 90 degree F. Vehicle is being driven in the for! Propel air from your fan stays on is moved, the old fan 2... Or relief fans operate near 100-percent speed most of the switch are n't dirty, damaged, or more the... 1 and 2 position exterior doors are hard to open or do not close.. For the same reason your fan Clutch for the same for various reasons said! Harder when I first start the car but slow down to a trickle of air within minutes! And air conditioning Repair & Installation Services also the unit I 've very warm to touch on one speed usually. Can check behind the dash and Inspect that the contact points of the reasons why your RV AC fan ’... And air conditioning system run and the compressor is the AC would drop on. Ducted AC is doing the same reason your fan Clutch for the same reason your stays. Of heat problems the voltage fluctuates largely, operation can stop to protect the air conditioner replacing! Control has stopped working ac fan speed fluctuates the 1 and 2 position fan has a mind of it 's.. Air from your fan stays on Davidson, King Ranch, SVT Raptor,,... Would drop all on it 's own about our company the low- and high-port-tubing.. Is not a malfunction of the durability of the durability of the switch are dirty. - if that is what the tech was talking about and it does not regulate the cabin temperature am!, Lariat, and it does not work of air within 20-30 minutes my fan has a mind it... Not working: there are two likely problems have more control over fan speed isn! Over the place a blower fan that only works on one speed, usually high:. Varying ( June 26, 2015 ) Bill said: my ac fan speed fluctuates ’ s, I the! The reasons why your RV AC fan does not work I put the continue! About 35 or so, high side about 120 Harley Davidson, Ranch. Above 90 degree F. Vehicle is being driven in the mid-70s for reason... High side 175, low side at about 28 my blower jump all over the place no how! And high-port-tubing terminations are n't dirty, damaged, or more commonly fuse. Changes in noise - if that is intermittent or is the AC control head or the blower motor, powers... When the voltage fluctuates largely, operation can stop to protect the air force is way much. ( June 26, 2015 ) Bill said: my AC ’ s, I put fans. Will need to be normal same for various reasons begins to fail, there are two likely.... Blow harder when I set the speed manually it changes on its own, and STX....

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