The cycling time is not right. If your outside condensing unit keeps losing power and tripping the circuit, … If your thermostat is not working correctly, the unit doesn’t know to turn off even when the temperature is reached. Turn the air conditioner completely off, and. Shorted thermosensor will make fans run, but engaged ac clutch?? Especially if you have older ductwork in your building, you may be losing cool air through leaks in the ducts. Low side pipe that should be icy cold would always stay very very slightly cold. IAQ and Mold in NYC Buildings: Are Kids at Risk? If the air conditioning was off when the belt seized, then the clutch would need replaced. A leak investigation could also reveal a larger issue with the system … Brought into shop installed a new aftermarket cycling switch no results, installed a Ford update:-= new switch and wiring harness. To learn more, download a copy of our helpful guide to Calculating the Hidden Costs of Poor HVAC Maintenance. Compressor, condenser, evaporator, expansion valve, dryer, triple pressure switch, relays, thermal control amp, control head and even swapped the ECU! For better air flow, use a filter with a lower MERV value. Mid-August and temperatures are in the 70’s? And I have no desire to figure it out either. Even when the pressure should have made it turn off. The car only has 22k miles, and I always run the A/C compressor, either with the DEF or A/C on, so it always gets used. Check your thermostat to see if the actual temperature in the space is below the set point. It has to drop below 20 to disengage the clutch. A defective compressor clutch can be replaced, but it is generally recommended to replace the entire compressor to save time and additional costs. A/C clutch engaged all the time. Jump to Latest Follow 1 - 5 of 5 Posts. It’s also using way too much electricity and running up your electric bill. At 35, the clutch will stay engaged. Cuts down on humidity in the car but the main reason it is setup that way is to keep the oil circulated through the system during the cooler seasons. The compressor runs constantly from the time the engine starts. Okay, spray some water on the condenser and see what happens. It appears I have a ground problem, that was the answer from the A/C shop. I will do you one better Ken. I noticed my A/C compressor stays engaged when I turn the A/C on. Been that way for years. Adjusting the fan speed can solve the problem. I have a spare stock Nissan one and I am going to try that next. Compressor Clutch Basics. Fault Explanation: :Compressor clutch: open circuit or short circuit to positive I plan on unplugging compressor and testing voltage going to it then applying 12v directly to compressor clutch. Have you recently renovated your space or rearranged the layout without changing your air conditioner? I have 2011 Mazda CX7. This is part of the programming that is built into the electronic system that takes all extra systems that might rob power from an engine under acceleration and redirects it to the engine itself. Without enough air flowing over the coils, the system can’t remove humidity and cool the air to the set temperature, so it keeps running when it shouldn’t. Lol. The compressor clutch doesn’t move; Odd noises when the AC is running; In order to figure out what the exact cause of your AC troubles is, it’s important to bring your car to an automotive specialist to perform a differential diagnosis. Leaky ducts. It’s possible that your unit is no longer adequate for the needs of your space. Pressure on low side ranges from 35-45 psi. Compressor clutch disengaged and both rad fans stopped running. Low refrigerant charge. A defective AC compressor clutch assembly can cause excessive noise or vibration when the air conditioning is on. Low refrigerant charge will cause the compressor to run all the time as it won't be able to cool the coil to the required temp (freeze out threshold). To utilize the AC on your car on demand, the clutch compressor is activated. Since the clutch engages, there is enough refrigerant in the system (pressure) for the clutch to engage. Faulty thermostat. If the compressor clutch is damaged, it keeps the air conditioning system on or off permanently. So it was then I bought a new pressure switch and that was when I discovered I could never shut the silly thing off. Blower motor and fan issues. at the ac compressor it will have a pulley on it with a clutch that engages when the air conditioning is on. Your A/C compressor clutch is one of the most important parts of a vehicle’s air conditioning system. The only thing to pay attention to is whether you hear hissing/swooshing sound when AC clutch cycles. From the looks of it, the climate control head is commanding the compressor on all the time. I will remove that signal wire from the ECU from the relay tomorrow and report back my findings. What Happens When You Don’t Change the AC Filter, HVAC System Maintenance: 6 Tips for Heating Season, Essential Equipment for Commercial Kitchens: HVAC Make Up Unit. The flow of air can be impeded by dirt and debris from the air, but also from accumulated leaves or even animal or insect nests. My Ford Crown Vic 2005 had low refrigerant and compressor would cut off even on normal acceleration (not wot). :-/. If the system were where it is supposed to be, the compressor would kick on/off constantly once the system has been run for a little while. He took to shop and they replaced thermosensor on compressor. It is a thirty degree old school mechanical switch stuffed onto the EVAP core, a relay and a master kill switch for winter use. If I disconnect the pressure switch on dryer clutch stops. My air is nice and cold, has the right amount of PAG and refrigerant, but when the car starts, I can hear the clutch engaging with the system turned off. Okay, So I took my vehicle to a couple of hack shops, The A/C shop told me I had a ground problem so he sent me to a auto electric shop. Replacing the faulty clutch assembly does not necessitate replacement of the complete AC compressor or evacuation and recharging of the air conditioning system. Fixed all the problems. I drive the car or let it idle for 1/2 hour twice a week. What To Do When Your Air Compressor Runs Continually. I have spent hours and hours pouring over wiring diagrams trying to find out where this thing is getting a ground to close the AC relay. There are several causes for concern. That is the first good idea I have heard yet! Those cheap low-pressure testers that come with the charge kits only tell you part of the story. Stand in front of the AC compressor at the front of the engine. The relay tells the magnetic clutch on the AC compressor to engage or disengage. However, since it consistently is cycling on and off, it starts to wear and break. Let me just reiterate, I did find a wire crossed at pressure switch to make the compressor run 100% of the time (fixed) The compressor, pressure switch, expansion valve, dryer have all been replaced, system has been evacuated, flushed, but the pressure is running to high on the high side. To run this compressor, the car’s engine is directly connected to the pump rotor of the compressor with a belt. I have replaced expansion valve, dryer, Freon. Just like the evaporator coils on the inside, the condenser coils on your outdoor unit also need to be cleaned, possibly even more so since they are exposed to the elements. When your system’s air filter is full of dirt and debris, the flow of air is restricted, … I have shot all wires in this system to the ECU and I have nothing grounding out. Most of the time the clutch fails and locks to the compressor housing causing the compressor to not turn. Dirty or blocked condenser. If you can name it, I have changed it. The clutch does not disengage while running, both on Normal or Max, and sweats a lot, but is ice cold. The only way to stop it is to disconnect it at the top of the compressor with the little 2 wire plug. I have a work around in mind. After a while it starts to engage for few seconds and than back off for about 10-15. So at 10 degrees outside temperature the pressure of the refrigerant is lower then the pressure needed to engage the pressure switch that allows the compressor to run. I will get one tomorrow and let you know the results. Frozen evaporator coil. The clutch will engage regardless of the AC being on if the vent is set to defrost. Pressure is not cycling 35 low 150 and up on high. I was talking with the guy at O'reillys. The clutch will be enabled after the pressure decreases to less than 1578 kPa (229 psi). That is why it disconnects when you remove the wires from the low pressure switch. When I first turn the car on I can see the A/C clutch being engaged, but after the car runs for bit, then clutch disengages. If you don’t have enough refrigerant in the system, probably due to a leak in the coils, your unit can’t cool the space. Sure, he is not the one that has to reclaim, vacuum and recharge 134a. GLYN, if you get any further along, please post it here. Eighty degrees outside (Texas). If you have auto-climate control on, the AC compressor will run continuously, summer and winter, if the auto-climate control is on any setting other than off. Good luck. If it is, there’s a good chance that the thermostat may need replacing. Did'nt fix it. AC compressor will run in defrost whether the AC button is on or not. 116 people reported this problem Video footage on how to get your car or truck AC compressor to stop turning on and off. If the sensor is acting normally then it’s time to start hunting down a short in the system. The AC compressor usually cycle on and off and is run by a belt. Seems to me right after I rebuilt the entire AC system, I had rapid clutch cycling. The a/c constantly cycles. AC compressor stays on all the time – Common causes Auto-climate control. ? The rate of how fast it will cycle is determined by the outside temperature. While A/C clutch is engaged, pressure gauge shows it to be on bottom side of green. The joints may not be sealed, or the insulation may be gone. AC compressor won't turn on. The AC lines are ice cold and it still cools really well but I don't dare use it till the clutch cycles correctly. Even if your air filter is new, you may be using one that’s too restrictive for your system (such as one designed to remove pollen and allergens). A layer of grime on the fan blades can also slow it down, so again you may just need a good cleaning. Pink wire grounding th relay. It's Like There Is A Blockage. This is unlikely because the refrigerant pressure is relevant to temperature. Low refrigerant level If your blower motor is not producing enough air for your system, or the fan is running at a low speed, that can cause the system to lose enough efficiency to make it run too much. How Does Workplace Ventilation Impact Employee Productivity? If the cold air does not stop, then I'd say the clutch is stuck. If the air conditioning was running when the belt was seized, then the compressor and the clutch would need replaced along with a new belt. On off A/C switch in passenger compartment does not light up. The guy at the electric shop tried to convince me to run a ground from the relay so the compressor would stay on (all the time), not knowing I knew better. Is There... My A/c Has Been Acting Up Like This For Almost A Year Already. … I even get both fans running too! Is your AC running all the time without shutting off, or cycling on and off continuously? When this happens, the unit will keep running as it works harder. I hope that helps. You can always test the clutch by disconnecting it and seeing if the cool air stops. The underdash multiplex unit in fusebox went bad and took the ac out, dome light, power door locks,etc. Can you test the AC switch to make sure the signal is being cut when the switch is off? Ken, I removed the signal wire running from the relay back to the ECU. It makes you wonder if the dog days of summer are behind us or if they’ll be back with a vengeance next week. I pulled the rear hvac fuse and the heat/ac fuse and the compressor stayed running. He was questioning the brand new triple pressure switch I installed and wanted to get me another one. Don’t “Let it Go!”, Commercial Refrigeration Service & Repair, AC Troubleshooting: 10 Common Causes of a Constantly Running System, Calculating the Hidden Costs of Poor HVAC Maintenance, COVID-19 & Your HVAC System: Your Questions Answered. if it engages and disengages it can be the clutch itself has gone bad, the ac clutch will also disengage if there is not enough freon in the ac system, will also engage and disengage if … I have a 2003 f250 6.0 Diesel. And now this. I Don't Hink This Car Has A Cabin Filter. It sends a signal to the ECM to turn on and when you turn off the A/C, the signal is still being sent. And don’t forget about the wear and tear on your air conditioner from all that unnecessary work. Since the cool weather has ruled out the obvious, that it’s so hot outside that the unit NEEDS to run constantly to reach the set temperature, then you need to call in a professional to get to the bottom of it. Something on my car is telling something the A/C should be running. A system investigation can uncover leaks in the system. Very weird! The belt turns a rotor, which has a friction plate attached to it. Leaks can be repaired through pipe replacement or by using clamps to cover the leaks. If this shuts off the compressor, then we at least know which direction to look. It’s a relief to have some cooler weather, but one thing that may put a damper on your comfort level is the sound of your air conditioner running constantly when you know it shouldn’t be. Here are some of the most common causes of this problem to help you do a little AC troubleshooting: Many of these issues can be taken care of, and even prevented entirely, with regular maintenance of your equipment. Talked to a friend who is a mechanic, he said there was air in the system. Again, this is normal operation.If you do find that your car’s air conditioner compressor i… Get your wiring diagrams out and work from the compressor back. This mechanical item pressurizes the entire A/C system and pushes the refrigerated air through the system and ensure that everything works properly. Regardless if Idling or driving, The A/C Compressor clutch cycles on and off constantly. Clogged air filter. I Had No Intentions Of Fixing But The 104 Degree Weather In Tx Is Starting To... Do I Need To Flush A/c System Before I Add Oil To It? If the switch is stuck on this will cause the problem. The Wiring Is Showing A Current And My Compressor's Clutch Clicks And Turns When... Each Fan Speed Blows Out Much Less Air Than It Use To. I swapped out the complete control head with another today and same deal. Incorrectly sized unit. More than likely you’ve got a problem with the unit. If there wasn't enough in the system, it wouldn't even do that. What’s more, neglecting this task can be costing you in many ways that you haven’t considered. My AC is always spending even if the AC is off does the AC always going to be running because I never had a clutch engage is this supposed to work that way with the AC compressor always running can you please give me a little bit inside on what's really going on because that the air is not circulating would be cold . Bring in a certified HVAC professional to do a load calculation, taking into account the design, size and needs of your building as well as windows and sun exposure, insulation and more. I am really starting to give the new pressure switch the stink eye. Not a whole lot was resolved. Thank you. With the engine running and the a/c on, use a multimeter to see if the sensor is sending a constant “on” signal to the control module. In this case, you need an experienced HVAC service professional to find and repair the leak and. When the AC is off, the wheel spins freely. You will also notice air conditioner compressor cycling when your car is under hard acceleration, like when you are pulling onto a major freeway. I have replaced; compressor, dryer, expansion valve. Roy, before I get a command center let me say that the compressor clutch would stay engaged all the time. I suggested some testing in my last response. I have this exact issue haunting me right now. Near the rotor is an electromagnet--a coil of wire which produces a magnetic field when current is run through it. If your unit is blowing warm air from the supply vents in addition to running constantly, it may have frozen up. Okay, Let me start over, I have had my vehicle to shops. The PCM disables the compressor clutch if the A/C pressure is more than 2957 kPa (429 psi). The electrical auto guy says it is a thermostatic meter. Restrictive filters. Yes, trial and error we will find the problem. Compressor runs for 4 second then off for 6 seconds then over & over. O'Reillys said I probably got a faulty switch from them. Low 35 are so, high going up to 250. When your system’s air filter is full of dirt and debris, the flow of air is restricted, which can impede the functioning of your air conditioner. A good cleaning using professional products and tools will take care of this problem. The compressor has a magnetic clutch. Even my … When AC gauges are attached we watched the clutch come off & on. A belt drive attached to the engine spins constantly, providing energy for the AC compressor. Start the engine and let it warm up. Improved parts are available. If your air compressor is constantly running, you should consider having your system inspected by a professional.

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