@bhurry turn your AC off and see if the fan still stays on. Professional Heating, Air Conditioning Repair & Installation Services. Often it will blow harder when I first start the car but slow down to a trickle of air within 20-30 minutes. Idle, when guage is not fluctuating - low: about 35 or so, high side about 120. Has anyone modified their fan speed on their roof top ac? bumps also affect it so all the pot holes in minneapolis are making my blower jump all over the place! Either the motor is malfunctioning and will need to be replaced, or more commonly the fuse has blown out. Average failure mileage is 15,000 miles. 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. 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. Those are just some of the reasons why your RV AC fan isn’t working. ... 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. So I wanted to know if I'm on the right track. It seems to be cycling on and off on the A.C setting too fast. When the voltage fluctuates largely, operation can stop to protect the air conditioner. I am also assuming that it's ok to run the CPU at 100% 24/7 because of the durability of the PM. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents. Re: Intermittent blower motor operation. 2014 Silverado Fan Speed. Return or relief fans operate near 100-percent speed most of the time. 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). Mine blows so hard even on low speed. 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 ? there is onlt two things that would cuase you fan speed problem. I just replaced my a/c fan with a factory one that works perfectly fine as well.. Is the switch going bad? It's never ever shut down because of heat problems. The fan will only operate at speeds 3 and 4. 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. 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. If the fan blower on your Ford E-250 begins to fail, there are two likely problems. Activating the Automatic Fan Speed checkbox on the main screen enables fan control. that would explain changes in noise - if that is what the tech was talking about. 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 . the ac control head or the blower motor resistor. 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. 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). 2. A/C temps fluctuates while driving Posted by mizak82, Jun 21, 2011. I have noticed a few times my fan has a mind of it's own. The 2010 Nissan Titan has 1 problems reported for fan speed fluctuates. 2008 santa fe ac/heat fan/blower jumps up and down. The A/C Heater speed control has stopped working on the 1 and 2 position. After the usual 2 min. Building differential static pressure fluctuates widely and/or rapidly. Return- or relief-fan speed fluctuates widely and/or rapidly. Before this time (about 2 days ago), my rated speed was 1.8GHz. 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%. Once it reaches the 70 F setpoint, it starts alternating between FAN blowing ambient air … When running my AC’s, I put the fans on manual speed, normally at med. The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. Accessing the fan blower's motor or replacing the fuse should only take about five minutes. The Clean Air Act Inc. is a professional heating and air conditioning company who serves the greater Portland, OR area. The module decides on the fan speed depending on how close the target temperature is to the current cabin temperature. Now it fluctuates randomly. Medium or High fan speed this doesn't happen. This is not a malfunction of the air conditioner. Thanks. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? You can check behind the dash and inspect that the contact points of the switch aren't dirty, damaged, or shot. - 2009-2014 Ford F-150 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. 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 … Regarding the subquestion about the fan speed fluctuating which was asked under the subject "Clutch Slipping at 40K." 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. 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. Outside Temps above 90 degree F. Vehicle is being driven in the city, all systems appear to be normal. The air conditioner manufacturers have the minimum temperature set in the mid-70s for a reason. 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. No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. Randomly, the Front Blower Motor will stop moving cold air. Exterior doors are hard to open or do not close securely. Perhaps your ducted AC is doing the same for various reasons. 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? 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