If the sensor is acting normally then it’s time to start hunting down a short in the system. If comfort is your goal, leave the fan running. The fan just seems to come on and off whenever it wants rather than running constantly when car is off. So why the heck is your AC running? When your fan is set to AUTO on your thermostat, it will only run when the cooling component of your AC is running (when your AC system has conditioned air to blow throughout your home). Which engine is in your car a Vulcan or Duratec? Haltamim issue of the fan is on the cooling part of the car not the air conditioning. I noticed the fan would come on for around 5 mins then off again for a few mins, turning off and on fairly randomly. But that action turned off only the blower fan and I could still hear the condenser fan running so I manually tripped the corresponding circuit breaker (dedicated to my heating and cooling system) and went back to bed. The problem I've just got is I have a constantly running radiator/condenser fan (with A/C on) but the gas pressure is OK and apparently the system is sort of 'OK'. Low speed after AC is turned off most likely comes from AC. Check the manual for your particular model. it is related to the air conditioning unit. 1,356 Posts #2 • May 13, 2017 (Edited) Hi Common problem on the 1.6 petrol, you don't mention your engine type. Blower motor and fan issues. Now these two things happened a few years back. If the actual room temperature is below what your thermostat is set for, there’s a good chance you’re due for a repair or replacement. Cause. If not then just replace the sensor, although I’ve never actually seen a pressure sensor malfunction and actually make the compressor constantly run. A failed sensor can cause the fan to run excessively or not run when cooling is needed. Low Outdoor Temperatures. I assume that's normal. In most cases like this, the run capacitor needs to be replaced. I also noticed the condenser fan is always running and there's a little ice forming on the vent on the ceiling where the cold air comes out of. helps dry out the air to defrost window quicker. In my case, the cooling fan comes on when the engine is cold, even with the HVAC off and it will remain running at full speed when the engine is running, again with the HVAC off. If the unit constantly running is the only problem you’re having, then it’s not actually a problem at all. The sensor shown in the diagram is for air conditioning. We’ll explain… A heat pump runs in the summer and the winter. Low refrigerant level It cost me Rs. If accessing fault codes, there are no relevant DTCs stored in the engine control module (ECM) or signal acquisition module (SAM). Every time I go to start the car after it has been sitting for an entire day and the engine is cold, when I turn the key to the “On” position, before the engine is even started, the cooling fan comes on. Heating AC InspectionThe most popular service booked by readers of this article is Heating AC Inspection. The AC has a feed line to command, depending on configuration, the fan on (condenser or cooling fan). This sensor switches the cooling fan off and on as needed. The good news is this doesn’t always spell trouble. i unplugged the air conditioning compressor and the fans quit running. That will keep the air in the house mixed up so you don't get hot spots and cold spots. 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. There is a switch in the high pressure (small) line of the AC system that turns the radiator fan on when open. 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. FYI air conditioner compressor also runs when heater selector is in defrost mode. my 2011 escape having same issue with engine fans running constantly. However, if your fan … Robert1958 on July 06, 2019: I have a 1995 Ford Taurus GL Wagon and the temperature use to run about middle of normal. The winter season in the Pacific Northwest can be fairly mild, but other times it’s particularly brutal. See, there’s both a high pressure side and a low pressure side in your system when the AC is running. 2. totally normal and the same for all cars (at least, same with volkswagens and mercs) Quote; Link to post Share on other sites. The "auto" setting means less energy usage, because it keeps the fan running the least amount of time at the slowest speed needed for heating and cooling. This stopped the radiator fan running all the time and also fixed the lack of cold air from the air-conditioning. Schedule . In simple terms, an AC compressor is a pump which creates the heat by putting the air conditioning refrigerant under extremely high pressure. its a 2005 2500 5.7L. you can also switch heater control to vent mode and it will stop fans from running. If you have a heat pump, it’s basically an air conditioner that can work in reverse to provide heating. What's your goal: comfort or efficiency? Fan running all the time cooling not air con Hi Again, Thanks for the last post but I think we are at cross purposes. Your mini-split is simply doing its job as it was intended to. Pros to Running Fan on Air Conditioner Continuously: Keeping the fan on creates a more even distribution of heating and cooling, circulating the air if you have cold or hot spots in your house, like a bedroom above a garage. I got the AC Blower Motor Assembly replaced on Friday at Local Electrician. However, the problem has come back with the radiator fan. On cooling, the fan will run only when the air conditioner is running. In the words of many repairmen, an AC compressor is the heart of an AC system. Yes. If it stops working, your engine could overheat and be damaged. Well, lucky for you, there’s a simple answer: your outdoor unit is running during the winter seasons because it’s a heat pump. If your car has a vent mode see if the compressor runs in vent mode, if not you can run the heat in vent mode without the A/C ever running. AC compressor is an important part in the car’s air conditioning system. If you hear the AC hissing after you turn your car off, that’s actually just your car’s way of equalizing pressure. The customer complaint is that the cooling fan runs constantly and that the air-conditioning is not as cold as usual. The customer complaint is that the cooling fan runs constantly and that the air-conditioning is not as cold as usual. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. History: Problem occurred a few months back and the mechanic replaced the high pressure A/C sensor. After that I noticed strange behaviour of Radiator Fan. You should hear a slight hum from the compressor and the air coming off the unit should be warmer than the ambient air entering it. Get your wiring diagrams out and work from the compressor back. Changed the relay, anyone know what turns the fan relay on and off. When the AC is switched ON (Compressor), the Radiator Fan also switches ON (even though the Engine Temperature is at C) along with Condenser Fan. Diagnosis. The AC compressor usually cycle on and off and is run by a belt. Assuming its a Vulcan flushing the heater core is a simple matter of. Next Step. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. I would be willing to bet when the compressor was removed, someone jumpered out the cooling fan relay(s) so both fans run constantly. The refrigerant used in your air con system is extremely cold and has the added benefit of cooling down the air con compressor. But when I switch off the engine, I hear a fan running constantly, even though the … A capacitor that is malfunctioning or failing can cause the fan’s motor to slow down and/or overheat. What surprised me is there's not much air blowing out of it, ever. If necessary, they will be able to replace your AC condenser fan so that your car’s AC system can be repaired. Less frequent starts and stops of the fan can reduce the stress from startup, and potentially help extend it’s lifespan. If it's a multiple stage unit it will increase fan speeds to compensate for the compressor kicking into higher speeds. Air conditioning even has its uses on cold winter days. These two parts work together to cool your home, but don’t always turn on and off at the same time. 4500/- + Labour Rs. Ways to Help Maintain Your Air Conditioner’s Fans. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. This problem is often caused by a faulty pressure sensor located on the air-conditioning condenser. Hi, I have a problem with the radiator fan running continuously. The fan only runs when the furnace tells it to. I think you used to be able to see more air coming out. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. The fan mode for central air conditioning systems is entirely different from the fan mode for window-box air conditioning … I sat out in the drive for a while earlier when the car was off and fan was still running. 600/-. Diagnosis. How does a car’s cooling fan work? My condenser fan is always on when the truck is running. Relay. Adjusting the fan speed can solve the problem. the radiator fan also ventilates the air conditioning condenser matrix which is in front of the radiator. My fault is with air conditioning and an EC light. It may seem logical to think that a fan for an air conditioner is the same as a fan that you use in a room, thought this is not the case. This problem is often caused by a faulty pressure sensor located on the air-conditioning condenser. Now it's just a little frozen mist like you see a bit when you exhale on a cold day. Sometimes it would come on for a few seconds then off again for a few minutes . the wire you bridge it with doesn't have to be very thick because it's just for a relay. The fan in your AC system can run separately from the cooling component of your AC. AC compressor stays on all the time – Common causes Auto-climate control. The fan mode and switches are one such example. The cooling fan in a Toyota has a relay to regulate when power is provided to the fan. Properly draining the coolant into a container. 2) fan constantly run - a unspecified corroded switch - cleaned and problem fixed. Next morning, I switched on the circuit breaker again and hearing nothing, turned on my AC from the thermostat. Without refrigerant, or if it were to run too low, the compressor would get dangerously hot and fail. if it didn't draw enough air through the condenser, the refrigerant wouldn't be able to lose the heat from the cabin. Cause. Hi, I've a 1996 Honda Accord LX.When I start the Air conditioner, it works fine. Run capacitors create the rotating magnetic field in your system’s condenser fan. Pros. Malfunctioning Thermostat – A faulty thermostat can cause your AC fan to run constantly by not knowing when the desired temperature has been reached. The cooling fan relay is the relay that controls the engine’s cooling fans. So look for a Blue plug with green wires going to it near where the AC lines go into the firewall and bridge that connector. 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