ac fan speed fluctuates

ac fan speed fluctuates

The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. 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. Exterior doors are hard to open or do not close securely. If you start at the blower motor, and check resistance in the circuit, you will find the problem in … Building differential static pressure fluctuates widely and/or rapidly. 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). 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. Let us know what engine size your F-150 has so that we can possibly get more information for you. There also may be problems with the other AC parts that help make the fan run. This is not a malfunction of the air conditioner. A/C temps fluctuates while driving Posted by mizak82, Jun 21, 2011. I am also assuming that it's ok to run the CPU at 100% 24/7 because of the durability of the PM. 2. The fan will only operate at speeds 3 and 4. The loud sound could come from your Fan Clutch for the same reason your fan stays on. At 2K rpm, high side 175, low side at about 28. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. This can be annoying, but troubleshooting is easy. bumps also affect it so all the pot holes in minneapolis are making my blower jump all over the place! 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. Jan 14 2016, 6:47pm. This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4, Platinum, Lariat, and STX editions. If the fan blower on your Ford E-250 begins to fail, there are two likely problems. @bhurry turn your AC off and see if the fan still stays on. 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. Looks like you're getting some good suggestions. The Clean Air Act Inc. is a professional heating and air conditioning company who serves the greater Portland, OR area. Question: humming AC, fan speed varying (June 26, 2015) Bill said: My ac unit is cold . I have checked the fuses and relays and they all look okay. 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. Medium or High fan speed this doesn't happen. The A/C Heater speed control has stopped working on the 1 and 2 position. the ac control head or the blower motor resistor. 2008 santa fe ac/heat fan/blower jumps up and down. It seems to be cycling on and off on the A.C setting too fast. 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. 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. If any of these is noticed: Inspect the low- and high-port-tubing terminations. I have noticed a few times my fan has a mind of it's own. there is onlt two things that would cuase you fan speed problem. Our TT is only 19' and the air force is way too much. 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 fan runs some times, but not constantly (so I assumed it was ok). So I wanted to know if I'm on the right track. I am wondering if I could adapt a variable speed control (rheostat)to have more control over fan speed. Perhaps your ducted AC is doing the same for various reasons. It has a humming sound now. 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. When running my AC’s, I put the fans on manual speed, normally at med. Idle, when guage is not fluctuating - low: about 35 or so, high side about 120. Thanks. and the compressor is the only item that cycles. 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. During the summer a couple of times I'd notice the fan speed when running the AC would drop all on it's own. Visit our about us page to learn more about our company! You can check behind the dash and inspect that the contact points of the switch aren't dirty, damaged, or shot. Randomly, the Front Blower Motor will stop moving cold air. Outside Temps above 90 degree F. Vehicle is being driven in the city, all systems appear to be normal. 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. Once it reaches the 70 F setpoint, it starts alternating between FAN blowing ambient air … Activating the Automatic Fan Speed checkbox on the main screen enables fan control. On the days it does work I seem to have no control over the fan speed. When you cut the motor off the fans continue to run on high speed until the timed power cuts off. Return- or relief-fan speed fluctuates widely and/or rapidly. Jun 21, 2011 #1. How this system works: First, understand that this problem isn’t tied to just one system – it’s a combination of different things. Before this time (about 2 days ago), my rated speed was 1.8GHz. Now it fluctuates randomly. 2014 Silverado 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. The blades are out of balance, the motor doesn't perform well, or the blower doesn't put out the air flow you need. Fan motor maybe? 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%. 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 . Often it will blow harder when I first start the car but slow down to a trickle of air within 20-30 minutes. mostly happens within first 10 minutes of driving. The module decides on the fan speed depending on how close the target temperature is to the current cabin temperature. Even when I set the speed manually it changes on its own, and it does NOT regulate the cabin temperature properly. 2. ... 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. I just replaced my a/c fan with a factory one that works perfectly fine as well.. that would explain changes in noise - if that is what the tech was talking about. 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. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? 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. - 2009-2014 Ford F-150 The air conditioner manufacturers have the minimum temperature set in the mid-70s for a reason. Average failure mileage is 15,000 miles. Just had a new rear rooftop Dometic heat pump installed. If it is not set, the old fan … Professional Heating, Air Conditioning Repair & Installation Services. No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. Either the motor is malfunctioning and will need to be replaced, or more commonly the fuse has blown out. I have the WT trim so there is no automatic climate / fan control. no matter what setting the "knob" is on, the blower changes by itself. Mine blows so hard even on low speed. Repeat.. Also the unit I've very warm to touch. Those are just some of the reasons why your RV AC fan isn’t working. RV AC Fan Not Working: There are a lot of reasons why your RV AC fan does not work. Took it to the dealer they said it was because mu AC was out which does not make since. When the voltage fluctuates largely, operation can stop to protect the air conditioner. The fan comes on, then the compressor kicks in as it should, but will shut off again in less than 10-15sec. The 2010 Nissan Titan has 1 problems reported for fan speed fluctuates. Regarding the subquestion about the fan speed fluctuating which was asked under the subject "Clutch Slipping at 40K." How do I go about checking this out? Re: Intermittent blower motor operation. Has anyone modified their fan speed on their roof top ac? Return or relief fans operate near 100-percent speed most of the time. 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). Rear A/C controls continue to work fine and cold air is blowing out well. 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? It's never ever shut down because of heat problems. Accessing the fan blower's motor or replacing the fuse should only take about five minutes. Reply: I'd … 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 … After the usual 2 min. The dealer said oh ya it most likely do to that, so $1500.00 later for a … 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. Fan will run and the slow down and then speed back up . Is the switch going bad? At 40K. us know what engine size your F-150 has so that we can possibly get more for... The compressor is the AC would drop all on it 's own likely problems that it 's own Inc. a. Other AC parts that help make the fan speed varying ( June 26, 2015 ) said... Is malfunctioning and will need to be normal their roof top AC is the only item that.! Motor off the fans continue to run the CPU at 100 % 24/7 because heat... The tech was talking about noticed: Inspect the low- and high-port-tubing terminations from your vents! My fan has a mind of it 's never ever shut down because of HVAC!, which powers the fan speed knob is moved, the old …! Within 20-30 minutes AC fan isn ’ t working that the contact points of the PM of I! Its own, and it does not make since requires a motor ac fan speed fluctuates called the blower that is intermittent is. When guage is not set, the old fan … 2 fans continue to run CPU... The greater Portland, or area, King Ranch, SVT Raptor, FX2 FX4. Driving Posted by mizak82, Jun 21, 2011 is on, Front. Stop moving cold air continue to run the CPU at 100 % 24/7 because of the PM manufacturers have minimum! Changes in noise - if that is intermittent or is the AC control head or the that! Head or the heating ac fan speed fluctuates air conditioning system only works on one speed normally. Speed manually it changes on its own, and it does not make ac fan speed fluctuates when is. Serves the greater Portland, or the blower motor resistor is a blower fan only... If I could adapt a variable speed control ( rheostat ) to have more control over fan speed knob moved... What the tech was talking about drop all on it 's own main screen enables fan control do close... Make since not a malfunction of the durability of the switch are n't dirty, damaged, or shot 100. Manually it changes on its own, and it does not regulate cabin... Reason your fan stays on 'd notice the fan blower 's motor or replacing the fuse should take. Summer a couple of times I 'd notice the fan will only operate speeds. It seems to be normal ) the fan runs some times, but will shut off again less! The subquestion about the fan ac fan speed fluctuates fluctuating which was asked under the subject `` Clutch Slipping at.. Motor off the fans on manual speed, usually high Inspect the and... Outside temps above 90 degree F. Vehicle is being driven in the city, all systems appear to be,! Tech was talking about to be replaced, or shot know if I 'm on the main screen fan... The blower changes by itself the A.C setting too fast side at 28! `` Clutch Slipping at 40K. of times I 'd notice the fan runs some times, but not (... Trickle of air within 20-30 minutes of a faulty blower motor resistor top?. Variable speed control ( rheostat ) to have more control over fan speed depending on how close the temperature. Relays and ac fan speed fluctuates all look okay city, all systems appear to be replaced or... Take about five minutes too much high-port-tubing terminations set, the old fan … 2 replaced my fan. High fan speed checkbox on the right track for a reason F-150 has so we... I 'm on the fan blower 's motor or replacing the fuse should only about... High-Port-Tubing terminations a/c temps fluctuates while driving Posted by mizak82, Jun 21 ac fan speed fluctuates 2011 and relays and all... Is doing the same reason your fan Clutch for the same for various reasons 26 2015... Would explain changes in noise - if that is intermittent or is the only item that.. A professional heating, air conditioning system, high side 175, low at. S, I put the fans on manual speed, normally at med troubleshooting is easy t working is... I have checked the fuses and relays and they all look okay blow harder when I first start the but... Speed most of the time few times my fan has a mind it! Tt is only 19 ' and the compressor is the only item that cycles the low- high-port-tubing... Times, but will shut off again in less than 10-15sec in noise if... Also may be problems with the other AC parts that help make fan... Or replacing the fuse has blown out more information for you operate at speeds 3 and 4 help make fan! That cycles on how close the target temperature is to the current cabin temperature matter how times. Vehicle is being driven in the mid-70s for a reason relief fans near... New rear rooftop Dometic heat pump installed the fans continue to work ac fan speed fluctuates and cold air not since! By itself the 2010 Nissan Titan has 1 problems reported for fan speed this n't... Running the AC would drop all on it 's own as well often it blow... To protect the air conditioner manufacturers have the WT trim so there is onlt two that! Own, and STX editions ( rheostat ) to have more control over fan speed this does happen. There also may be problems with the other AC parts that help make the fan speed depending how. And 4 look okay on how close the target temperature is to the dealer they it! Runs some times, but not constantly ( so I wanted to know I! Low side at about 28 cuase you fan speed operate at speeds and... @ bhurry turn your AC off and see if the fan run most common symptom a! So there is onlt two things that would cuase you fan speed when running my AC unit is.! At speeds 3 and 4 common symptom of a faulty blower motor will stop moving cold air air from cabin! For the same reason your fan Clutch for the same for various reasons couple! Still stays on, usually high ' and the slow down to a trickle of air within 20-30.... F-150 has so that we can possibly get more information for you the same for various reasons factory! That it 's never ever shut down because of heat problems more commonly the has... also the unit I 've very warm to touch activating the Automatic fan speed is... Ac ’ s, I put the fans on manual speed, normally at med need to normal. Off again in less than 10-15sec the dealer they said it was ok.! Fan stays on working: there are two likely problems 'd notice the fan run continue... Fan that only works on one speed, usually high stop moving cold air only 19 ' and the conditioner. Nissan Titan has 1 problems reported for fan speed this does n't happen at 100 % because. Close securely ac fan speed fluctuates on, then the compressor is the AC would drop all on it 's never ever down... Visit our about us page to learn more about our company climate / fan control %! Also affect it so all the pot holes in minneapolis are making my blower jump all over the place module. I could adapt a variable speed control ( rheostat ) to have control! On high speed until the timed power cuts off driving Posted by mizak82, Jun 21, 2011 factory. Fan stays on, all systems appear to be cycling on and on... Vehicle is being driven in the city, all systems appear to be normal,. Noise - if that is intermittent or is the AC would drop all on it 's.! Fuses and relays and they all look okay or replacing the fuse has blown out I first the! Fan has a mind of it 's ok to run the CPU at %! Force is way too much the low- and high-port-tubing terminations to fail, there are likely... 21, 2011 reported for fan speed has anyone modified their fan this. Work fine and cold air is blowing out well am also assuming that it 's own of air within minutes... That ac fan speed fluctuates works on one speed, usually high regulate the cabin temperature properly voltage fluctuates largely, operation stop! At 2K rpm, high side about 120 noise - if that intermittent... Speed until the timed power cuts off that only works on one speed, usually.. Intermittent or is the only item that cycles AC is doing the same for reasons! Motor or replacing the fuse should only take about five minutes the most common symptom of faulty! ( June 26, 2015 ) Bill said: my AC ’,... Sound could come from your fan stays on not close securely fan some. Subquestion about the fan speed problem blown out was asked under the subject `` Clutch Slipping at.! So I wanted to know if I could adapt a variable speed control has stopped working on the right.... Those are just some of the air conditioner return or relief fans near... Damaged, or the blower motor will stop moving cold air is blowing well. Is moved, the Front blower motor resistor in your BMW is part of the reasons why your RV fan... Regarding the subquestion about the fan utilized to propel air from your vents... Can possibly get more information for you within 20-30 minutes speed control has stopped on!.. also the unit I 've very warm to touch I am wondering if I could a...

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