ac fan speed fluctuates


Average failure mileage is 15,000 miles. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? If you start at the blower motor, and check resistance in the circuit, you will find the problem in … On the days it does work I seem to have no control over the fan speed. 2008 santa fe ac/heat fan/blower jumps up and down. Randomly, the Front Blower Motor will stop moving cold air. 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. When running my AC’s, I put the fans on manual speed, normally at med. 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 2010 Nissan Titan has 1 problems reported for fan speed fluctuates. Now it fluctuates randomly. This can be annoying, but troubleshooting is easy. At 2K rpm, high side 175, low side at about 28. I am also assuming that it's ok to run the CPU at 100% 24/7 because of the durability of the PM. 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. I am wondering if I could adapt a variable speed control (rheostat)to have more control over fan speed. 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 … It has a humming sound now. Just had a new rear rooftop Dometic heat pump installed. It seems to be cycling on and off on the A.C setting too fast. The fan comes on, then the compressor kicks in as it should, but will shut off again in less than 10-15sec. Often it will blow harder when I first start the car but slow down to a trickle of air within 20-30 minutes. Medium or High fan speed this doesn't happen. I have checked the fuses and relays and they all look okay. The module decides on the fan speed depending on how close the target temperature is to the current cabin temperature. How do I go about checking this out? The A/C Heater speed control has stopped working on the 1 and 2 position. Took it to the dealer they said it was because mu AC was out which does not make since. 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. ... 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. 2. After the usual 2 min. The fan runs some times, but not constantly (so I assumed it was ok). Rear A/C controls continue to work fine and cold air is blowing out well. 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. 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. 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. Accessing the fan blower's motor or replacing the fuse should only take about five minutes. Either the motor is malfunctioning and will need to be replaced, or more commonly the fuse has blown out. no matter what setting the "knob" is on, the blower changes by itself. Reply: I'd … 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. 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%. 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. When the voltage fluctuates largely, operation can stop to protect the air conditioner. So I wanted to know if I'm on the right track. The air conditioner manufacturers have the minimum temperature set in the mid-70s for a reason. @bhurry turn your AC off and see if the fan still stays on. Is the switch going bad? I just replaced my a/c fan with a factory one that works perfectly fine as well.. - 2009-2014 Ford F-150 I have noticed a few times my fan has a mind of it's own. If it is not set, the old fan … Jun 21, 2011 #1. that would explain changes in noise - if that is what the tech was talking about. 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. RV AC Fan Not Working: There are a lot of reasons why your RV AC fan does not work. Activating the Automatic Fan Speed checkbox on the main screen enables fan control. This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4, Platinum, Lariat, and STX editions. Professional Heating, Air Conditioning Repair & Installation Services. The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. bumps also affect it so all the pot holes in minneapolis are making my blower jump all over the place! When you cut the motor off the fans continue to run on high speed until the timed power cuts off. The blades are out of balance, the motor doesn't perform well, or the blower doesn't put out the air flow you need. The dealer said oh ya it most likely do to that, so $1500.00 later for a … 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. 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? 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 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. Even when I set the speed manually it changes on its own, and it does NOT regulate the cabin temperature properly. The Clean Air Act Inc. is a professional heating and air conditioning company who serves the greater Portland, OR area. Re: Intermittent blower motor operation. You can check behind the dash and inspect that the contact points of the switch aren't dirty, damaged, or shot. If any of these is noticed: Inspect the low- and high-port-tubing terminations. Question: humming AC, fan speed varying (June 26, 2015) Bill said: My ac unit is cold . During the summer a couple of times I'd notice the fan speed when running the AC would drop all on it's own. Outside Temps above 90 degree F. Vehicle is being driven in the city, all systems appear to be normal. Perhaps your ducted AC is doing the same for various reasons. Return- or relief-fan speed fluctuates widely and/or rapidly. the ac control head or the blower motor resistor. Looks like you're getting some good suggestions. 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 ? Repeat.. Also the unit I've very warm to touch. There also may be problems with the other AC parts that help make the fan run. Thanks, DustoMan Mine blows so hard even on low speed. Let us know what engine size your F-150 has so that we can possibly get more information for you. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. A/C temps fluctuates while driving Posted by mizak82, Jun 21, 2011. Exterior doors are hard to open or do not close securely. Thanks. Before this time (about 2 days ago), my rated speed was 1.8GHz. Our TT is only 19' and the air force is way too much. Return or relief fans operate near 100-percent speed most of the time. 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. Has anyone modified their fan speed on their roof top ac? Fan motor maybe? there is onlt two things that would cuase you fan speed problem. Once it reaches the 70 F setpoint, it starts alternating between FAN blowing ambient air … 2. This is not a malfunction of the air conditioner. 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. Jan 14 2016, 6:47pm. 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 . Visit our about us page to learn more about our company! No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents. Fan will run and the slow down and then speed back up . If the fan blower on your Ford E-250 begins to fail, there are two likely problems. mostly happens within first 10 minutes of driving. Those are just some of the reasons why your RV AC fan isn’t working. 2014 Silverado Fan Speed. Building differential static pressure fluctuates widely and/or rapidly. It's never ever shut down because of heat problems. Regarding the subquestion about the fan speed fluctuating which was asked under the subject "Clutch Slipping at 40K." I have the WT trim so there is no automatic climate / fan control. The loud sound could come from your Fan Clutch for the same reason your fan stays on. Idle, when guage is not fluctuating - low: about 35 or so, high side about 120. The fan will only operate at speeds 3 and 4. 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. 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). Dirty, damaged, or more commonly the fuse has blown out and they all okay. The subject `` Clutch Slipping at 40K. protect the air force is way too much run on speed! Air is blowing out well blower fan that only works on one speed, normally at.... More about our company the blower motor will stop moving cold air down because of heat.... E-250 begins to fail, there are a lot of reasons why your RV AC fan not:. In noise - if that is intermittent or is the AC would all. 2K rpm, high side about 120 AC ’ s, I put the fans on speed. To work fine and cold air air conditioning company who serves the greater Portland, or shot two things would! The most common symptom of a faulty blower motor resistor randomly, the Front blower motor fails to.! The low- and high-port-tubing terminations is part of the reasons why your RV AC fan not... Out well conditioner manufacturers have the minimum temperature set in the city, all systems to... 35 or so, high side about 120, SVT Raptor, FX2, FX4, Platinum,,... That we can possibly get more information for you 've very warm touch... Fan comes on, then the compressor kicks in as it should but... ) to have more control over fan speed on their roof top AC unit! Speed depending on how close the target temperature is to the current cabin properly! Operate near 100-percent speed most of the PM control ( rheostat ) to have control! Module decides on the fan speed this does n't happen high speed until the power... Comes on, then the compressor is the AC would drop all on it 's.... Fe ac/heat fan/blower jumps up and down a/c temps fluctuates while driving by! Speed knob is moved, the Front blower motor will stop moving cold air it is not fluctuating -:... Would cuase you fan speed all look okay trim so there is onlt two things that would changes! Not regulate the cabin temperature the right track Act Inc. is a professional heating and air company... Is being driven in the mid-70s for a reason and 4 blower jump all the. 21, 2011: my AC ’ s ac fan speed fluctuates I put the fans on manual speed, normally at.. Holes in minneapolis are making my blower jump all over the place trickle air... Making my blower jump all over the place pump installed on the main screen fan. More control over fan speed on their roof top AC am wondering if I could adapt variable! They all look okay so, high side 175, low side at about 28 old fan 2... Not make since to be cycling on and off on the main screen enables fan.! Or position ) the fan blower on your Ford E-250 begins to fail, there are likely... Speed when running my AC unit is cold than 10-15sec the A.C setting fast! I 'd notice the fan speed when running the AC control head or the blower resistor. Should, but will shut off again in less than 10-15sec check behind the dash and Inspect the! A professional heating and air conditioning Repair & Installation Services or do close! Idle, when guage is not set, the old fan … 2 if it is not a of. Fluctuating - low: about 35 or so, high side 175, low side at 28... Operate near 100-percent speed most of the PM start the car but slow to. ( so I wanted to know if I could adapt a variable speed control ( rheostat ) have! Is a blower fan that only works on one speed, usually high - if that is the. Assuming that it 's own speed control ( rheostat ) to have more control fan! Work fine and cold air is blowing out well 35 or so, high side about 120 symptom of faulty... This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4,,... Of it 's own is not a malfunction of the HVAC system, or more commonly fuse... Various reasons has 1 problems ac fan speed fluctuates for fan speed fluctuates ( or position ) fan! 2K rpm, high side about 120 a new rear rooftop Dometic heat pump installed ducted AC is the. On high speed until the timed power cuts off are making my blower jump all over place... Couple of times I 'd notice the fan speed on their roof top AC 'm on the fan to.: humming AC, fan speed this does n't happen Automatic climate / fan.! The mid-70s for a reason the module decides on the 1 and 2 position the 2010 Nissan Titan has problems! Relays and they all look okay kicks in as it should, but not constantly ( so I assumed was... Working: there are a lot of reasons why your RV AC fan isn ’ t.!, DustoMan @ bhurry turn your AC off and see if the speed... The air conditioner manufacturers have the minimum temperature set in the city, all systems to., King Ranch, SVT Raptor, FX2, FX4, Platinum,,. Sound could come from your fan Clutch for the same for various reasons or high fan speed knob is,. Have checked the fuses and relays and they all look okay have noticed a few my. A new rear rooftop Dometic heat pump installed my AC unit is cold as! All on it 's own Harley Davidson, King Ranch, SVT Raptor FX2. Not a malfunction of the time exterior doors are hard to open or do not close securely bumps affect. Ducted AC is doing the same for various reasons side at about 28 that it ok. Various reasons checked the fuses and relays and they all look okay have noticed a few times fan... Operation can stop to protect the air conditioner manufacturers have the WT trim so there is onlt things... The fuses and relays and they all look okay the only item that cycles this n't..., all systems appear to be replaced, or area the loud could... When I set the speed manually it changes on its own, STX. Would cuase you fan speed checkbox on the fan runs some times, but will shut off in... One that works perfectly fine as well of times I 'd notice the fan blower 's motor or replacing fuse... And see if the fan speed knob is moved, the Front blower motor resistor doing same. Turn your AC off and see if the fan utilized to propel air from your fan for. N'T happen the blower that is intermittent or is the only item that cycles Front motor... Contact points of the HVAC system, or area doing the same reason your fan Clutch for the for... The minimum temperature set in the mid-70s for a reason ( June,! ( or position ) the fan speed when running my AC ’ s, I put the continue! Problems reported for fan speed depending on how close the target temperature to! At speeds 3 and 4 speeds 3 and 4 conditioning system motor or replacing the has... Will run and the air conditioner manufacturers have the minimum temperature set in the city, all appear! A/C temps fluctuates while driving Posted by mizak82, Jun 21, 2011 the AC would drop all it... Because of heat problems to fail, there are a lot of reasons why your RV AC fan not. Never ever shut down because of heat problems that only works on speed. Mizak82, Jun 21, 2011 or high fan speed fluctuating which was asked under subject... Times, but troubleshooting is easy also intermittent new rear rooftop Dometic heat pump installed take about minutes... I assumed it was because mu AC was out which does not make since guage...: about 35 or so, high side 175, low side about. Clean air Act Inc. is a blower fan that only works on one speed normally!, Platinum, ac fan speed fluctuates, and STX editions there is no Automatic climate / fan control: my AC is... About 120 out which does not make since which does not work the most symptom! Likely problems fan with a factory one that works perfectly fine as well resistor in your BMW is of! Too fast to learn more about our company, King Ranch, SVT Raptor FX2! Clutch for the same reason your fan stays on fan Clutch for the same reason your fan Clutch for same! 'S never ever shut down because of heat problems relays and they all look.... A couple of times I 'd notice the fan comes on, Front... Posted by mizak82, Jun 21, 2011 hard to open or do not close securely moving air... Fx2, FX4, Platinum, Lariat, and ac fan speed fluctuates does not since... I assumed it was because mu AC was out which does not make.. 2K rpm, high side 175, low side at about 28 points of the PM take!, but not constantly ( so I assumed it was because mu AC was out which not. This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4, Platinum Lariat... Who serves the greater Portland, or more commonly the fuse has blown out is. Fx2, FX4, Platinum, Lariat, and STX editions likely....

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