It makes you wonder if the dog days of summer are behind us or if they’ll be back with a vengeance next week. Eighty degrees outside (Texas). Replacing the faulty clutch assembly does not necessitate replacement of the complete AC compressor or evacuation and recharging of the air conditioning system. I have 2011 Mazda CX7. To run this compressor, the car’s engine is directly connected to the pump rotor of the compressor with a belt. Talked to a friend who is a mechanic, he said there was air in the system. This mechanical item pressurizes the entire A/C system and pushes the refrigerated air through the system and ensure that everything works properly. I have a 2003 f250 6.0 Diesel. The AC lines are ice cold and it still cools really well but I don't dare use it till the clutch cycles correctly. The compressor is designed to cycle on and off. A/C clutch engaged all the time. I suggested some testing in my last response. I will remove that signal wire from the ECU from the relay tomorrow and report back my findings. 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. Blower motor and fan issues. Why Do I Have White Fog Coming From Air Vents Even When Air Is Off. Sure, he is not the one that has to reclaim, vacuum and recharge 134a. 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. Roy, before I get a command center let me say that the compressor clutch would stay engaged all the time. Who knows, maybe the new ones are not wired correctly? 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 . 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). at the ac compressor it will have a pulley on it with a clutch that engages when the air conditioning is on. 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. Get your wiring diagrams out and work from the compressor back. Compressor Clutch Basics. If the ac compressor is turning on when you have something on (floor, heat, vent) then this is normal. It's Like There Is A Blockage. I pulled the rear hvac fuse and the heat/ac fuse and the compressor stayed running. The electrical auto guy says it is a thermostatic meter. Please confirm this so we can continue. AC compressor will run in defrost whether the AC button is on or not. Turn the air conditioner completely off, and. It’s possible that your unit is no longer adequate for the needs of your space. 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. The a/c constantly cycles. Ken, I removed the signal wire running from the relay back to the ECU. I have replaced; compressor, dryer, expansion valve. Compressor clutch disengaged and both rad fans stopped running. More than likely you’ve got a problem with the unit. Low side pipe that should be icy cold would always stay very very slightly cold. The relay tells the magnetic clutch on the AC compressor to engage or disengage. When your system’s air filter is full of dirt and debris, the flow of air is restricted, … The PCM disables the compressor clutch if the A/C pressure is more than 2957 kPa (429 psi). Those cheap low-pressure testers that come with the charge kits only tell you part of the story. Okay, Let me start over, I have had my vehicle to shops. If there wasn't enough in the system, it wouldn't even do that. Okay, do you mean if you have less than 20 lbs of pressure on the low side, the compressor is still engaged? 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. I Don't Hink This Car Has A Cabin Filter. Pressure is not cycling 35 low 150 and up on high. When the AC is off, the wheel spins freely. If you do, then the system is likely low on refrigerant. A good cleaning using professional products and tools will take care of this problem. 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. A layer of grime on the fan blades can also slow it down, so again you may just need a good cleaning. It is a thirty degree old school mechanical switch stuffed onto the EVAP core, a relay and a master kill switch for winter use. That is the first good idea I have heard yet! If your unit is blowing warm air from the supply vents in addition to running constantly, it may have frozen up. He held one of the pipes while the compressor was running and said … So it was then I bought a new pressure switch and that was when I discovered I could never shut the silly thing off. 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. My car has 167000 miles. Leaks can be repaired through pipe replacement or by using clamps to cover the leaks. 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. If the sensor is acting normally then it’s time to start hunting down a short in the system. I even get both fans running too! The cycling time is not right. A belt drive attached to the engine spins constantly, providing energy for the AC compressor. Shorted thermosensor will make fans run, but engaged ac clutch?? It appears I have a ground problem, that was the answer from the A/C shop. The only way to stop it is to disconnect it at the top of the compressor with the little 2 wire plug. A defective AC compressor clutch assembly can cause excessive noise or vibration when the air conditioning is on. A defective compressor clutch can be replaced, but it is generally recommended to replace the entire compressor to save time and additional costs. If enough cool air escapes, the temperature in your space never reaches the set point and the system will keep running. Clogged air filter. Yes, trial and error we will find the problem. If you can name it, I have changed it. I will do you one better Ken. A system investigation can uncover leaks in the system. I have shot all wires in this system to the ECU and I have nothing grounding out. 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. Regardless if Idling or driving, The A/C Compressor clutch cycles on and off constantly. 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. Dirty or blocked condenser. Stand in front of the AC compressor at the front of the engine. The underdash multiplex unit in fusebox went bad and took the ac out, dome light, power door locks,etc. ? Lol. I Have Checked The Relay. If your air compressor is constantly running, you should consider having your system inspected by a professional. Low refrigerant charge. For better air flow, use a filter with a lower MERV value. What To Do When Your Air Compressor Runs Continually. And don’t forget about the wear and tear on your air conditioner from all that unnecessary work. S a good cleaning A/C on FROZEN HVAC system Regardless of the AC compressor will! 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