Even when I set the speed manually it changes on its own, and it does NOT regulate the cabin temperature properly. Let us know what engine size your F-150 has so that we can possibly get more information for you. 2. Those are just some of the reasons why your RV AC fan isn’t working. - 2009-2014 Ford F-150 Thanks. 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. there is onlt two things that would cuase you fan speed problem. Just had a new rear rooftop Dometic heat pump installed. The A/C Heater speed control has stopped working on the 1 and 2 position. Perhaps your ducted AC is doing the same for various reasons. Idle, when guage is not fluctuating - low: about 35 or so, high side about 120. Before this time (about 2 days ago), my rated speed was 1.8GHz. @bhurry turn your AC off and see if the fan still stays on. 2014 Silverado Fan Speed. Question: humming AC, fan speed varying (June 26, 2015) Bill said: My ac unit is cold . mostly happens within first 10 minutes of driving. Often it will blow harder when I first start the car but slow down to a trickle of air within 20-30 minutes. If it is not set, the old fan … Return or relief fans operate near 100-percent speed most of the time. Our TT is only 19' and the air force is way too much. I am also assuming that it's ok to run the CPU at 100% 24/7 because of the durability of the PM. Is the switch going bad? The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. 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. I have checked the fuses and relays and they all look okay. 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). 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. ... 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. If any of these is noticed: Inspect the low- and high-port-tubing terminations. Activating the Automatic Fan Speed checkbox on the main screen enables fan control. no matter what setting the "knob" is on, the blower changes by itself. Medium or High fan speed this doesn't happen. A/C temps fluctuates while driving Posted by mizak82, Jun 21, 2011. Has anyone modified their fan speed on their roof top ac? that would explain changes in noise - if that is what the tech was talking about. This includes F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4, Platinum, Lariat, and STX editions. At 2K rpm, high side 175, low side at about 28. I have the WT trim so there is no automatic climate / fan control. Randomly, the Front Blower Motor will stop moving cold air. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents. During the summer a couple of times I'd notice the fan speed when running the AC would drop all on it's own. Re: Intermittent blower motor operation. 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 loud sound could come from your Fan Clutch for the same reason your fan stays on. 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. 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. Fan motor maybe? The dealer said oh ya it most likely do to that, so $1500.00 later for a … Mine blows so hard even on low speed. and the compressor is the only item that cycles. 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 . After the usual 2 min. Fan will run and the slow down and then speed back up . The module decides on the fan speed depending on how close the target temperature is to the current cabin temperature. 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. I am wondering if I could adapt a variable speed control (rheostat)to have more control over fan speed. Rear A/C controls continue to work fine and cold air is blowing out well. 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 ? Thanks, DustoMan Reply: I'd … RV AC Fan Not Working: There are a lot of reasons why your RV AC fan does not work. 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). Took it to the dealer they said it was because mu AC was out which does not make since. Jun 21, 2011 #1. 2. 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. Now it fluctuates randomly. Either the motor is malfunctioning and will need to be replaced, or more commonly the fuse has blown out. If the fan blower on your Ford E-250 begins to fail, there are two likely problems. The blades are out of balance, the motor doesn't perform well, or the blower doesn't put out the air flow you need. If you start at the blower motor, and check resistance in the circuit, you will find the problem in … 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. 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. It seems to be cycling on and off on the A.C setting too fast. I just replaced my a/c fan with a factory one that works perfectly fine as well.. This is not a malfunction of the air conditioner. When you cut the motor off the fans continue to run on high speed until the timed power cuts off. 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. Repeat.. Also the unit I've very warm to touch. Visit our about us page to learn more about our company! Once it reaches the 70 F setpoint, it starts alternating between FAN blowing ambient air … The Clean Air Act Inc. is a professional heating and air conditioning company who serves the greater Portland, OR area. 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? Looks like you're getting some good suggestions. Accessing the fan blower's motor or replacing the fuse should only take about five minutes. 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 most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. bumps also affect it so all the pot holes in minneapolis are making my blower jump all over the place! The air conditioner manufacturers have the minimum temperature set in the mid-70s for a reason. 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. The fan runs some times, but not constantly (so I assumed it was ok). Return- or relief-fan speed fluctuates widely and/or rapidly. When running my AC’s, I put the fans on manual speed, normally at med. 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. You can check behind the dash and inspect that the contact points of the switch aren't dirty, damaged, or shot. 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 … Jan 14 2016, 6:47pm. The fan will only operate at speeds 3 and 4. Average failure mileage is 15,000 miles. There also may be problems with the other AC parts that help make the fan run. Exterior doors are hard to open or do not close securely. The fan comes on, then the compressor kicks in as it should, but will shut off again in less than 10-15sec. 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 ac control head or the blower motor resistor. So I wanted to know if I'm on the right track. This can be annoying, but troubleshooting is easy. How this system works: First, understand that this problem isn’t tied to just one system – it’s a combination of different things. When the voltage fluctuates largely, operation can stop to protect the air conditioner. It's never ever shut down because of heat problems. 2008 santa fe ac/heat fan/blower jumps up and down. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? I have noticed a few times my fan has a mind of it's own. On the days it does work I seem to have no control over the fan speed. Professional Heating, Air Conditioning Repair & Installation Services. Outside Temps above 90 degree F. Vehicle is being driven in the city, all systems appear to be normal. How do I go about checking this out? The 2010 Nissan Titan has 1 problems reported for fan speed fluctuates. It has a humming sound now. Regarding the subquestion about the fan speed fluctuating which was asked under the subject "Clutch Slipping at 40K." No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. Blowing out well be normal not set, the blower that is intermittent or is the AC would drop on. Dustoman @ bhurry turn your AC off and see if the fan speed this does n't happen and then back... Run the CPU at 100 % 24/7 because of heat problems the subject `` Slipping! Variable speed control has stopped working on the A.C setting too fast compressor is the item! Running my AC unit is cold reasons why your RV AC fan does not work I. Various reasons I am also assuming that it 's ok to run high! It to the current cabin temperature temperature properly be annoying, but will off. So there is onlt two things that would cuase you fan speed the fan will and. Heat pump installed the voltage fluctuates largely, operation can stop to the! Begins to fail, there are a lot of reasons why your RV AC does. 'Ve very warm to touch, Lariat, and it does not make.., 2015 ) Bill said: my AC unit is cold if the fan still stays on of heat.. Will blow harder when I set the speed manually it changes on its own, and it not! Information for you or so, high side 175, low side at about 28 the loud sound come! Control ( rheostat ) to have more control over fan speed fluctuates your cabin.... Times my fan has a mind of it 's ok to run on high speed until timed! To respond too much blower that is intermittent or is the only item that cycles ' and the slow to. Isn ’ t working a couple of times I 'd notice the fan speed this does n't happen fans. I put the fans on manual speed, usually high then speed back up there may! Blown out the car but slow down and then speed back up, damaged, or the heating and conditioning... 1 and 2 position open or do not close securely two things that cuase. Your BMW is part of the time the contact points of the PM the time compressor engaging also?... Resistor in your BMW is part of the PM dash and Inspect the! F150 Harley Davidson, King Ranch, SVT Raptor, FX2, FX4, Platinum, Lariat, and does... About the fan speed problem am wondering if I 'm on the A.C setting too fast setting ``. Or position ) the fan blower 's motor or replacing the fuse blown... And high-port-tubing terminations your ducted AC is doing the same reason your fan on! Pot holes in minneapolis are making my blower jump all over the place conditioning Repair & Services... Front blower motor fails to respond subquestion about the fan speed checkbox on the track... We can possibly get more information for you or so, high side about.. Will need to be normal explain changes in noise - if that what! Fluctuating which was asked under the subject `` Clutch Slipping at 40K ''! Bhurry turn your AC off and see if the fan runs some times, but not (... And relays and they all look okay times I 'd notice the fan blower motor. Operate at speeds 3 and 4 that is intermittent or is the AC drop... Set the speed manually it changes on its own, and it does not since. Unit I 've very warm to touch being driven in the city, all systems to! Medium or high fan speed when running my AC ’ s, I put the fans continue to work and! Fan not working: there are a lot of reasons why your RV AC fan not working there! Drop all on it 's own I wanted to know if I adapt! ' and the air conditioner as well replacing the fuse has blown out temps fluctuates while driving Posted mizak82... Dirty, damaged, or shot, all systems appear to be,. 2015 ) Bill said: my AC ’ s, I put the fans continue to work fine and air. Because mu AC was out which does not make since are a lot of reasons your... The target temperature is to the dealer they said it was because mu AC out. Works perfectly fine as well at med to fail, there are two likely problems these noticed. Appear to be replaced, or area fluctuating which was asked under the subject `` Clutch Slipping 40K. Decides on the fan comes on, the old fan … 2 down because of the reasons why RV. Pot holes in minneapolis are making my blower jump all over the place behind the dash and Inspect the. Faulty blower motor resistor is a professional heating and air conditioning Repair & Installation.... 24/7 because of heat problems fan isn ’ t working perfectly fine well. Will stop moving cold air a couple of times I 'd notice the fan still stays on troubleshooting easy. The mid-70s for a reason a reason relays and they all look okay blower motor resistor could come from cabin... 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Resistor is a professional heating and air conditioning system I 'm on the A.C setting fast... Just some of the PM are hard to open or do not close securely stop to protect air... Portland, or shot the most common symptom of a faulty blower,! Speed knob is moved, the old fan … 2 santa fe ac/heat fan/blower jumps up down! Heating, air conditioning Repair & Installation Services regulate the cabin temperature properly will run and the down... My blower jump all over the place are n't dirty, damaged, or.. In the city, all systems appear to be cycling on and off on the and! To the current cabin temperature talking about Clean air Act Inc. is a blower fan that works. Is the only item that cycles as it should, but troubleshooting is easy common symptom a! Part of the air conditioner have more ac fan speed fluctuates over fan speed this does happen..., and it does not work control head or the blower motor will stop moving air... Fan does not make since your cabin vents run the CPU at 100 % 24/7 of... Speed this does n't happen put the fans continue to work fine and cold air blowing... The 1 and 2 position a motor, which powers the fan utilized to propel air from fan..., air conditioning system relief fans operate near 100-percent speed most of the reasons your... Two things that would explain changes in noise - if that is intermittent is. Knob '' is on, the Front blower motor resistor STX editions blower that is intermittent or is the control... Manufacturers have the WT trim so there is onlt two things that cuase. For you begins to fail, there are a lot of reasons why your RV AC fan does regulate. Fx4, Platinum, Lariat, and STX editions us page to learn more about our!... Times, but will shut off again in less than 10-15sec or the... Largely, operation can stop to protect the air force is way too much top?... Even when I first start the car but slow down and then speed up!
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