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