My car has an automatic transmission. Should You Run an Air Conditioner & Ceiling Fan Together?. When the thermostat reaches your temperature setting, the system, including the blower fan, shuts off. Automotive Mechanic. The outside fan should run in ac and in heat. Using the "auto" option for the fan is a better choice. Other potential issues that could shut down the outside unit may include the coils freezing up, a malfunction of the fan in the condenser, an electrical issue, or a problem with the refrigerant line. If it’s 80 degrees outside, that means setting the AC to run at 78 or 75 instead of 70. Setting Your HVAC Fan to “ON” When you set your fan to “ON,” you’re telling it to keep running 24 hours a day, 7 days a week, regardless of the heating or cooling setting. By running the fan after the coil warms up, a lot of that water will evaporate and be put right back into your home. AUTO means the fan turns on “automatically” ONLY when your system is heating or cooling your air. 2 Answers . the fans are supposed to come on when the temperature guage is at around half and they come on to prevent it from rising furthur, not lowering the temperature. The primary fan comes on at about 225 to … If your coolant level is low there is a chance that you will get air in the system and the coolant temperature sensor will not read correctly. The good news is, as long as I shut off the AC and didn’t sit in one place too long, the engine stayed cool without the fan, and I was able to get home. With this in mind they decided that the fan should preempitively come on any time you use your AC. 0 0. helpful bob. The reasoning given is that ceiling fans push the hot air down thus increasing the load on the air conditioners. 2005 Chrysler PT Cruiser. System has freon in it. We noticed that our outside ac unit runs (the fan) even though the thermostat control is set to "off" inside the house. Which to a certain extent is not wrong but what people forget is that the ceiling fans can create a breeze that makes people in the room feel cooler and more comfortable. Running the fan without the AC can also increase the humidity in your home, since the AC won’t be drying out the fresh air being drawn inside. Thi There are two settings on your thermostat to control the fan … Has there been any leaking from the hoses? If this connection went bad on its own, the high temperature switch would still make the fan come on when it heated up. Nope, fan is in auto amd mode is heat , heat comes on and so does the outside unit.not a heat pump , also i am getting 22 v at C and Y …at C and W i am getting 24.7v … it should be a bad tstat..but when i jump off at board with tstat in off mode.Y to C , heat also comes on with out side unit. If my cars AC is off , so the fan of AC should be on or off?? In between cooling cycles, the fan shuts off. I have a 95 corvette, does the secondary fan only come on with the A/C running? Asked by day2 in Elkton, MD on . Coolant fans not running when ac is turned on. When I set temp, (ac - heat - 66 - 78) and the thermostat reaches temp, it runs the fan afterwards and the fan stays on until it needs to kick on the AC to adjust the temp again. I have replaced the radiator, thermostat, and temp switch. Mechanic's Assistant: Have you checked the coolant level? It sounds like the ac could be on. Don’t worry about clockwise or counterclockwise. Since your AC is responsible for doing two jobs, cooling and dehumidifying, moisture from the air condenses on the cold evaporator coil when it runs. Our 2011 Subaru Outback 3.6R, which we bought brand new back in Feb ’11 and only has 4k miles, seems to be having issues with the cooling fan. I noticed today that my cars temp gauge started climbing at every stop, and would drop back down at a fast idle or when I started moving. 1 reply Report. also they should come on when the AC is switched on. Insufficient Coolant. The internet knowledge of the 3.6L pentastar fan setup is woefully inadequate. We often hear the debate around whether or not to run your AC Fan continuously. 1995 Chevrolet Corvette Coupe RWD-Maintenance & Repair. Window-box units can cool or fan the air. Naturally I looked to see if the fans were working. For more info including a troubleshooting guide, check out the heat pump page at my source. It's the days where the AC is only needed once every few hours where the computer room starts to become uncomfortably hotter than the rest of the house. Every other problem I've read about seems to be an issue of the system not blowing cool air. Fewer stops and starts should reduce wear and tear on the system. Pros and Cons. Both work ok but they come on at the same time. You may not be seeing the light for it on the control panel, but I've heard reports of people having that same issue... in fact I talked to a few this summer on this forum. IF A/C is cooling ok and engine isn't overheating... No problem!! Two things, the air flow may be blocked and/or the engine fan may not be turning. Often, the AC condenser can go bad, which is directly noticeable when the air conditioner is turned on. Troubleshooting Tips. One thing that I don't like is that the fan schedule ignores away/eco. This is the most energy efficient option. The fan needs to turn in the right direction to actually cool you off. 262,535 Report; G A answered 2 months ago Guru947V5N. Homeowners should use the "on" switch for the fan of an air conditioning unit sparingly, running the fan for a few minutes after the cooling part of the unit has stopped, according to Energy Vanguard. For the AC, this means keeping the thermostat closer to the temperature outside. 9 years ago. July 04, 2015. It may seem counterproductive to run your fan and your air conditioning at the same time, since both use energy to operate. The motor could be going bad or its run capacitor. One of them is, and one of them is not. Popular Answer . It was working find but now nothin7. First off, it’s helpful to know the two settings for your AC fan and the difference between them: AUTO—This setting runs your fan only when your AC is blowing cold air. Mark helpful. Here are the pros and cons of the ON vs Auto setting on your thermostat. As you suspect the fans should NOT be doing that. We currently have the system shut off at the breaker to prevent it from running. You should make it your daily habit to check the coolant levels in your radiator. Unfortunately, I quickly hit a dead-end. My car has 234565 miles. Running the AC Fan By Cheryl Munson Hunker may earn compensation through affiliate links in this story. The trigger is the thermostat in the radiator of your vehicle. The fan setting controls your AC’s blower; A fan inside your system that helps distribute air throughout your home. Here are some symptoms that you should look for to determine if your AC condenser needs to be repaired or replaced. It used to completely shut off. “Should I set my HVAC fan to auto or on” is a question we commonly receive from Homesense customers — along with “does running the fan on my air conditioner use a lot of electricity?” It’s a debated topic throughout the industry, so we’re going to give you the pros, the cons, and our recommendation. pushrod on . Should I repair replace or reprogram my engine computer to make the cooling fans run when the AC is off otherwise the car overheats. It’s a common belief that ceiling fans should not be used along with Air Conditioners. When AC is off, the air hitting the rad is outside air temp, when the AC is on, the air hitting the rad has been warmed by the condenser and is now much hotter than the outside air. Lv 7. Onto my point. Fan Selection: Depending on vehicle design, the fans may operate singly or in tandem. Your cooling fan comes on when the car reaches a particular temperature. The fan mode and switches are one such example. Jansen Heating and Cooling will be happy to send out trained technicians to look at your broken cooling system, diagnose what’s wrong, and recommend a prompt fix at a fair price. Could this be the thermostat? An oversized AC will shut off after a short run time and leave a lot of water sitting on the coil. Your air conditioning creates extra work, and heat, for yur engine. “Ceiling fans use no more electricity than light bulbs,” she said. Most air conditioner units have buttons labeled "fan" or "auto." If you can’t feel the breeze, turn off the fan and flip the switch that changes the direction of the blades. If so, I changed the low speed rad fan relay and it still won't run with a/c until the engine thermostat turns it on. When ac is on the fan doesn't turn off when it reaches the set temp. Fan + AC: A Cool and Breezy Dream Team. ON—This setting runs your fan constantly, even when your AC isn’t actively producing cool air. AC compressor clutch engage then it will disengage. Ceiling fans were the high-tech household comfort appliance of the early 20th century. As for whether it’s helpful or harmful to your HVAC system to run the fan continuously, there’s no clear answer. The fan should be pushing air down. Other problem is when heat is turned on the ac comes on also. In most cases, you should only turn ceiling fans on when people are using the room. You should be able to feel a breeze when standing directly under it. The fan setting on your thermostat controls your HVAC’s system blower. Multiple relays and resistor packs may be used to control fan activation. The cooling fan will come on when the engine is cold and it will stay on the entire time the engine is running. This is not usually a problem, if you have good air flow. Recommended Services. AC Recharge: $224.56 - $241.84: Get a Quote: AC is not working Inspection: $96.46 - $106.46: Get a Quote: Robert Kulp. On some vehicles, for example, only the condenser fan operates with the air conditioner, while only the radiator fan operates based on engine temperature. It's easy to understand what an air conditioner is supposed to do, but sometimes knowing what each function does can get complicated. If the fan continues to run for more than 30 minutes, disconnect the battery cable's negative side to prevent the battery from being drained. Is this a problem with the unit, or the thermostat inside the house? On very hot days, the AC runs so often that the fan is going regularly anyway. To prevent overheating, AC condensers are equipped with a fan that turns on when the temperature becomes high enough. Replace the relay and your fan should start working perfectly again. It may sound like a funny question, but some of the cars I have use one fan for when the water gets hot, and another fan for when AC is on. Should both fans come on when AC is turned on, cause only one comes on know. The second time the fan comes on is with your AC. Test fan relay; swap the bad fan relay with a good relay with the same pin design. The trick is to use them wisely, and on lower settings. Setting your fan to AUTO instead of ON better dehumidifies your home. Should the radiator cooling fan always run when the a/c is on? Why? It is what sends the signal for the fan. Answer. July 04, 2015. Continuously Running Your AC Fan. What should I do if the engine fan never turns off? Should I Set my HVAC System’s Fan Setting to Auto or On? 4. The blower helps circulate hot or cold air throughout your home until the temperature on the thermostat is reached.