Theres a chip on my pos battery terminal ( not sure if thats relevant) and im getting an downstream o2 sensor CEL for voltage. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced. Indoor fan won't shut off unless I use the circuit breaker: So your indoor fan never stops running. I have an 2005 impala and I replaced the blower, switch, and still can get the fan to turn on. My AC fan will not stop blowing even when the engine is completely off, no key in the ignition and all the switches are turned off. A compressor that shakes or stutters when it’s turned on, otherwise known as hard starting. Checking them would require having a warmed-up engine and the AC turned … My Air Handler Fan Won't Cut Off Step 1. AC Unit Running All the Time & Won’t Turn Off Commercial businesses and residential homes throughout the Greater Las Vegas, Nevada area have a reliable source when it comes to their HVAC system installation , repair , and maintenance services with Air Supply Heating and Air Conditioning . is not set to ON, and that it still runs when switching it to AUTO or Thermostat – Your thermostats are one of the most important and powerful components of your AC system. Inspect the duct work. My husband tried to rotate fan with a stick today with unit off, and the fan made quite a few free rotations before it stopped. Everything was working until one week ago. What have you tried so … Ac fan won't turn off. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced. These problems are not easy DIY repairs and should be left to an HVAC professional. Step 2. If the unit continues to run, it may be the thermostat. Clicking this will make more experts see the question and we will remind you when it gets answered. good chance you’re due for a repair or replacement. I was standing beside the truck, it was not running, hadn't started it for 2 days, when all of a sudden the heater/Ac fan came on, only way to shut it off was to disconnect the battery. An air conditioner that has lost its cooling capabilities or is cooling inadequately (i.e. If the condenser coils are dirty, they won’t be able to dissipate the heat as effectively. If the furnace does not even try to run, that is if it never even starts, then follow these steps: Check the thermostat settings t o be sure that you are calling for heat (set-temperature is above room temperature). Hunker may earn compensation through affiliate links in this story. The fan in your AC system can run separately from the cooling component of your AC. Common solutions for: LG Air conditioner won't turn off. Double-check the thermostat and make sure the fan Owen Richason grew up working in his family's small contracting business. – A faulty thermostat can cause your AC fan to run constantly by not In some cases, even when your air conditioning system cools to the set temperature, the outdoor unit continues to run and just won’t shut off. Try turning the fan to the “Off” or “Auto” mode to see if it stops running now that it is not running. The only way I managed to turn it off was by removing the A/C fuse from the engine fuse box. knowing when the desired temperature has been reached. If everything is working correctly, the AC should turn off since it’s reached the desired temperature. In either case, the enormity of cooling a residential or commercial space causes the unit to draw a lot of power. Furnace blower won't turn on [ 8 Answers ] I have a Bryant 395C furnace. 2001 330Ci radiator suction fan won't turn off at all. Malfunctioning Thermostat 4. When pressing the "off" button, the "auto" and "a/c" lights turn off, but the fan seems to blow harder. It’s normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops, but your fan shouldn’t run for hours on its own. When i turned the ac on, he said that fan still didn't make any noises on the roof, but entire ac … In normal operation, when your thermostat is set to “auto,” it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. liability resulting from the provided information. My Blower motor for the AC won't turn off. How Your Fan Normally Works. The best way to check if your thermostat is responsible for the AC not turning off is to set it to room temperature or slightly above. room temperature is below what your thermostat is set for, there’s a Heater fan won’t stop running – GM products Heater fan won’t run, Heater fan won’t stop running – GM products, Ranier, Escalade, Avalanche, Silverado, Suburban, Tahoe, Sierra, Yukon, Envoy GM has issued a technical service bulletin (TSB) #06-01-39-002B to address problems with the front blower motor. The fan that cools mostly when the AC is operating won't run under normal operation but may turn on in hot weather (or when the engine is under heavier loads) even without the AC operating. If the fan continues to run, there could be a problem in the thermostat or the wiring. Mechanic's Assistant: Are you fixing your XC60 yourself? 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