Should radiator fan turn on when ac is on - Join Date: Feb 2009. Location: kk. The fan comes on only when the air con is turned on and there is enough pressure to activate the system, thus high pressure equals fan on to cool and lower air con gas pressure. Secondly fan comes on with engine water temp too hot, the fan comes on briefly untill engine has cooled sufficiently.

 
All vehicle ac systems are sealed from the factory with service valves made available to hvac repair people and knowledgeable diyers. If ac fails to run, the ecm knows this and does not turn on cooling fans. A dead ac system doesn't need cooling fans. This does not affect when cooling fans are needed when coolant temps rise.. Visionworks johnson city tn

On the other hand, if the thermostat falls, you should look for other issues like a clogged hose, an air bubble in the cooling line, or a blocked radiator. 2. Temperature Sensor Gets Damaged. A damaged temperature sensor is another possible reason that can cause the cooling fan to come on even though the car is cold.Dec 28, 2016 · Are you saying that with the cabin heater/AC fan turned Off, the radiator fans don't come on when the OBD-indicated temperature rises above 212 F? Whether or not there's a flow problem, the fans should be turned on by the ECM when the coolant temperature is high, without having to turn on the AC. 23754 posts · Joined 2007. #5 · Oct 11, 2020 (Edited) The ECM/PCM controls cooling fan operation. It processes information from the coolant temp sensor, ambient (outside) air temp sensor, A/C pressure switch, and possibly others to determine off/on/speed of the fans. 2020 Cadillac XT5 Sport, Shadow Metallic outside, Cirrus/Jet …Nov 7, 2010 · Totally normal. Note that if your Jeep hasn't warmed up all the way, if you turn off the AC, the fan will go off. Theoretically, if you are moving, it should turn off as well, but I don't know if that is the case, and it's kinda hard to check... Long story short, electric fan operation with AC on is normal. No worries. Italian football, also known as calcio, has a rich history and is widely regarded as one of the most passionate and exciting leagues in the world. For decades, fans around the glob...After some time I was able to get a new compressor installed and after I pressurized the system the radiator fans turned on with the AC active! My biggest challenge was ordering my parts from Rockauto and got three bad parts. I finally just bought one from a local shop instead even though it cost me more. 551602. 5.Mar 20, 2023 · The radiator fan should always turn on when the AC is on because the radiator fan doubles as a condenser fan. The condenser is a second smaller radiator sitting in front of the coolant radiator and serves to cool down the high-pressure refrigerant. Science geeks, nerds and enthusiasts! Check out this quiz and see how much you know of Electromagnetic Radiation. Go! Advertisement Advertisement Science has provided us with so ma...The 2009-2012 v6 fan is a drop in for the 1500 5.7 and is not brushless. The pwm controller works for any standard fan. It will not work for brushless fans. I have been running an aftermarket version of the stock v6 fan from a 2012 for 2 years and the only issue I had was an electrical failure at the tipm. The radiator fan should turn on when the AC is on in most vehicles. This activation helps manage the additional heat generated by the AC system, aiding in maintaining the engine’s optimal temperature. However, factors like vehicle design, ambient temperature, and system health can affect function. The fan won't turn on unless the AC is on. It does not turn on when the ECT sensor is jumped with a wire but I don't think it's due to bad fuses or relays. According to the circuit diagram "Cooling Fan Controls Circuit Diagram (K20Z)", I believe my relays and fuses are working because I measured 12V at the radiator fan motor.8 Jul 2011 ... Usually just turns on and off once the engine reaches operating temp in order to keep the temps stable. It also turns on when you turn the AC on ...When you have radiation treatment for cancer, your body goes through changes. Follow your health care provider's instructions on how to care for yourself at home. Use the informati...Jack Ryan, the beloved CIA analyst turned field operative, has captivated audiences with his thrilling adventures and unwavering dedication to protecting his country. In this episo...The fan generally turns on when the engine temperature gets to 95 deg. C., or when the AC gets turned on. It's possible that your engine temp is at, say, 90 Celsius, which is a bit higher than normal ("normal" is 80-85 C), but still well within safe limits. That can happen when you are, for example, doing a lot of in-town driving.Mar 2, 2017 · At least until around 2009, as was noted earlier, if the engine is overheating, then the radiator fans should run regardless of whether or not the AC compressor is connected, or is turned on. Conversely, when the engine is not overheating , the radiator fans are normally not turned on (to save fuel) except if the AC (or windshield defroster) is ... Mar 14, 2015 · 7004 posts · Joined 2008. #3 · Mar 14, 2015. one fan turning on/off is perfectly normal. but it is a bit odd that it would go above 210 at all. if you turn on the a/c, that should automatically set the fans to the max fan speed. if the a/c is off, then it should depend on the temp of the coolant. next thing i would check is the thermostat if ... When the engine is cold the ETC switch should be closed ( that opens the radiator fan #1 relay) keeping the fan from running. When the coolent is hot, the ECT switch should be open ( closing the #1 relay) and allowing the fan to run. The second connector you found ,is probably it.All vehicle ac systems are sealed from the factory with service valves made available to hvac repair people and knowledgeable diyers. If ac fails to run, the ecm knows this and does not turn on cooling fans. A dead ac system doesn't need cooling fans. This does not affect when cooling fans are needed when coolant temps rise.Yes, the radiator fan should turn on when the ac is on as it helps to cool the refrigerant and maintain proper engine temperature. When the ac is turned on, the …on May 31, 2021. Why Does My Radiator Fan Only Work When the AC Is On? If your radiator fan only works when your vehicle’s AC is on, the most likely culprit is a faulty …When it comes to keeping your home cool and comfortable, a ceiling fan is an essential appliance. One popular brand that homeowners often turn to is Harbour Breeze. Known for their...An HACR circuit breaker is a heating, air-conditioning and refrigerator breaker. The breaker provides overcurrent protection to combustion fans, exhaust controls, AC compressors an...The air conditioner also functions as a dehumidifier and fan. Plus, its various settings give users the power to control the temperature, intensity of the fan, noise level, …The radiator fan must also turn on the air conditioner to work. The only other time the fan should turn is when the engine begins to overheat, but that only occurs in stop-and-go traffic or during hot weather, which is another reason it only operates while the AC is on. In conclusion, this is normal if your engine is not overheated.Thanked: 660 Times. re: Cooling fans turn on and off repeatedly, when the AC is on. Get your radiator and ac condenser cleaned with a pressure washer. Repeated kicking of fans occurs because the condenser alone is not able to dissipate heat owing to dust accumulation. ( 1) Thanks.Examine your air filter at least once a month while utilizing your central heating and cooling system. If you have the permanent type, change the filter at least once every three months. Check the filter before turning on your air conditioner for the season just to be safe. Step 4. Check Drain Lines.Thanks guys for the ideas. Here is an update: 1) nothing is blocking the fans., they spin freely. 2) the fans do turn on and run at times. (at both low and high speeds) 3) I replaced 6 relays and no change. 4) I replaced the fan control cpu and it looks like the fans are turning on sooner, but not always.My radiator fans will not turn on with AC on or off, even tried using defroster with AC on full cold or full hot, doesn't matter still won't turn on the fans. So I unplugged the cylinder head temp sensor and then the fans would kick on and stay on. I've replaced the temp sensor and the resistor in the front by the fans.When the AC is on, the radiator fan’s function is crucial for maintaining optimal engine temperature and AC system functioning. Here are some frequent reasons why the radiator fan may not work while the air conditioner is turned on: Faulty Radiator Fan. The radiator fan may become worn out over time.7 Feb 2021 ... If I turn the AC on, it does run, for maybe 15 seconds at a time, about once a minute. Seems to be low speed when it does kick in. It has ...Do you know how to drain a radiator? Find out how to drain a radiator in this article from HowStuffWorks. Advertisement Many homes are heated by using a boiler. The boiler heats wa...Dec 31, 2001 · 309 posts · Joined 2001. #2 · Dec 31, 2001. Primary fan turns on around 230 degrees and the secondary (high speed) fan turns on at around 257 degrees (i think). You might want to look into a fan controller. I have a Vinci and with the stock TSAT, I have it set to around 205 degrees. Both fans should operate when the coolant temperature sensor located in the tank at the bottom of the radiator has reached 212°F. Both radiator fans must be running whenever an AC compressor has been on.The most common causes of why a radiator fan is not working are a blown fuse, a bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged. While these are some of the reasons, the list is not exhaustive. Here is a more detailed list of the most common causes of a ...That leads me to believe that the condensor fan and/or the radiator fan is not running to blow cool the refrigant. So I opened the hood and turned the AC manually to the maximum. Bingo, after a while BOTH radiator fan and condensor fan stopped running (high speed or low), and then for 30 sec of so, they will try to spin up for a split sec and ...The fan issue sounds like burnt relay contacts at the fuse box. This is a common problem on these cars. When you undo the hex bolts that hold the fuse box, you can pull off the top half and inspect the connection points. If anything looks corroded/burnt, its time for a new box. 2007 Mustang GT/CS coupe.1249476. Unless your car is overheating in stop and go traffic, which means you do have a fan problem, the fans only run when engine temperature gets hot or you turned on the AC or defrost. This is normal. If the fans ran constantly you would be replacing the alternator every 6 months. How Often Does A Radiator Fan Turn On With Ac? The radiator fan may cycle on and off as needed when the AC is on. It turns on more frequently in hot weather or when the vehicle is stationary to provide sufficient cooling. Conclusion. Understanding your vehicle’s cooling system is crucial for optimal performance. Yes, the radiator fan should ... As mentioned, they should be fine because both fans turned when you turn on AC. You can try to remove the passenger side fan and look near the coolant inlet hose for the switch. When you disconnect the switch the fan should turn on. You may need to turn the key to ON, but engine can be off.The radiator fan should come on at around 199F and go to high speed when the coolant temp is +210F. The radiator fan is controlled by a relay and its contacts are fed by fuse #57 (30A) in the 'under-the-hood' fuse/relay box. That relay can be energized by temp switch A or by turning the AC on. The condenser fan has a separate …As mentioned, they should be fine because both fans turned when you turn on AC. You can try to remove the passenger side fan and look near the coolant inlet hose for the switch. When you disconnect the switch the fan should turn on. You may need to turn the key to ON, but engine can be off.On my old Pontiac Grand Prix, the radiator fan turns on whenever the AC is on (regardless of the coolant temperature). The dual-fan will also turn on when the AC is off and the coolant temperature is high (even after the engine is shut off). I haven't paid much attention to my newer cars if this behavior is still true. Not immediately in all ...If there is a spike in amperage or the motor is failing, the fuse could blow. You can replace the fuse and hope it was just a glitch. However, if the fuse continues to blow, there’s a bigger problem occurring. 3. Vehicle Overheating. The purpose of the radiator fan is to cool the vehicle.On my old Pontiac Grand Prix, the radiator fan turns on whenever the AC is on (regardless of the coolant temperature). The dual-fan will also turn on when the AC is off and the coolant temperature is high (even after the engine is shut off). I haven't paid much attention to my newer cars if this behavior is still true. Not immediately in all ...2194 posts · Joined 2009. #2 · May 12, 2011. I have to manually switch my LFP fan on when I use the AC. 2004 SVT Lightning. ¼: 11.30 @ 119mph - 93 octane. 782 rwhp / 794 rwtq - E85. Like.Mar 20, 2023 · The radiator fan should always turn on when the AC is on because the radiator fan doubles as a condenser fan. The condenser is a second smaller radiator sitting in front of the coolant radiator and serves to cool down the high-pressure refrigerant. From my understanding the fan should run on high speed when the AC is turned on for max airflow to draw as much air as possible across the condenser. I believe this is why my condenser went bad, no obvious signs it is leaking or has leaked but it has been replaced once already and I have noticed when the AC is turned on the Radiator …Nov 7, 2010 · Totally normal. Note that if your Jeep hasn't warmed up all the way, if you turn off the AC, the fan will go off. Theoretically, if you are moving, it should turn off as well, but I don't know if that is the case, and it's kinda hard to check... Long story short, electric fan operation with AC on is normal. No worries. Both radiator fans work when the AC is on but neither works when AC is off and overheats. - I know there are 3 relays for fan control. ... That is why the fan will turn off to heat up the coolant to keep the engine at a preset temp range. It is a constant read by the sensors to turn on and off the fans. ... Also both fans will come on if the ...Your engine temperature sensor is responsible for relaying your engine temp to the ECU. Once the temp gets so hot, the ECU commands the radiator fan to come on. If your CR-V has a bad engine temp sensor the radiator fan won’t know to come on, because the ECU won’t know how hot the engine is. You’ll need to locate and test the engine temp ...We have this 2019 Acadia where all of a sudden, at random, the radiator fan runs on high constantly, the AC stops blowing cold air, the thermostat gauge on the dash drops to the C, and the Power Assist is reduced and pops up as a message on the dash as well. Sounds like this may be a common problem among Acadia's.When the AC is on, the radiator fan’s function is crucial for maintaining optimal engine temperature and AC system functioning. Here are some frequent reasons why the radiator fan may not work while the air conditioner is turned on: Faulty Radiator Fan. The radiator fan may become worn out over time.When it comes to keeping your home warm and cozy during the cold winter months, a reliable and efficient heating system is essential. One popular option that many homeowners are tu...2. Check the coolant temperature sensor. If the sensor is not working correctly, you have to change it, and the problem will most likely be resolved. 3. Check for a bad radiator relay and replace the bad relay with a new one to get the fan to stop running after the engine is shut OFF.Italian football, also known as calcio, has a rich history and is widely regarded as one of the most passionate and exciting leagues in the world. For decades, fans around the glob...Would anyone know at what temp the radiator fans are programmed to come on? Also, what is your engine temp on the highway? I am getting ~215 degrees at 75mph on a 90 degree day with no trailer, AC on, in 10th gear. It will jump up to 225 under hard acceleration or going uphill. 2018 3.5L Ecoboost.10 Aug 2012 ... It does not close the circuit to ground until the coolant reaches about 225 deg. F. This is the switch that will keep the cooling fan running ...After some time I was able to get a new compressor installed and after I pressurized the system the radiator fans turned on with the AC active! My biggest challenge was ordering my parts from Rockauto and got three bad parts. I finally just bought one from a local shop instead even though it cost me more. 551602. 5.Mar 22, 2015 · There are 2 fans. Cooling fan and AC condenser fan. Right side is the condenser fan and left side is the cooling fan for your cooling system (not too sure). Which one isn't running? Your Cooling fan should not turn on if your engine is not over operating temperature threshold. Bleed the air out first of cooling system and then check if fans come on. If not do not waste anymore time and money!!! This relay saved my engine from overheating!!! Vehicle: 2000 Chevrolet Malibu Auxiliary Fan Control Unit Engine Cooling Fan Controller -- Premium adjustable fan control with push in probe that installs in the radiator fin section.Technology is turning us all into a bunch of time-wasters according to The Observer, which reports that the beep of an email alert alone is costing the US economy $70 billion per y...The air conditioner also functions as a dehumidifier and fan. Plus, its various settings give users the power to control the temperature, intensity of the fan, noise level, …Related to the powertrain. The problem RADIATOR FAN went out. Took it to a master mechanic {thats what hes known as} he said that it is normal for the fan to automatically power on when A/C is activated. The fan acts intermittingly. Will power on when necessary. Unless A/C is turned on, as previously stated.The radiator fan also plays an important role when the air conditioning (AC) system is in use, as the AC puts additional strain on the engine and increases the need for cooling. Understanding how the radiator fan works and when it should turn on when the AC is on is essential for maintaining the proper functioning of a vehicle.The radiator fan should always turn on when the AC is on because the radiator fan doubles as a condenser fan. The condenser is a second smaller radiator sitting in front of the coolant radiator and serves to cool down the high-pressure refrigerant.23754 posts · Joined 2007. #5 · Oct 11, 2020 (Edited) The ECM/PCM controls cooling fan operation. It processes information from the coolant temp sensor, ambient (outside) air temp sensor, A/C pressure switch, and possibly others to determine off/on/speed of the fans. 2020 Cadillac XT5 Sport, Shadow Metallic outside, Cirrus/Jet …1 Feb 2012 ... If you don't run the AC, the radiator fans will rarely turn on this time of year. As long as it doesn't overheat when driving in traffic you ...17 Jul 2021 ... If the AC is off, I believe it is normal for only one fan to come on unless it continues to heat up. When the AC is turned on, both fans ...Thanked: 660 Times. re: Cooling fans turn on and off repeatedly, when the AC is on. Get your radiator and ac condenser cleaned with a pressure washer. Repeated kicking of fans occurs because the condenser alone is not able to dissipate heat owing to dust accumulation. ( 1) Thanks.Three. Hello everyone, I am experiencing this weird issue with my 2013 Prius were the radiator fans would turn on and off continuously at full speed when the AC is turned on and the blower set to max speed (Video details on YouTube below). Also, if I set the blower speed to one bar, the fans would run at full speed without switching on and off.Sep 3, 2021 · I’ve got a 2013 with a 1.8L and the cooling fan doesn’t turn on at operating temp, but it does turn on with the ac. The ac clutch is messed up and sometimes stalls the engine, so I can’t have the ac running all the time. I’ve replaced this fan 5 times already and I can’t find the issue. I’ve checked the fuses and all is good. Placing your fan in the right spot can help slash AC costs. ... One big thing you may be overlooking when you turn on a fan is its placement. To ensure optimal cooling …If there is a spike in amperage or the motor is failing, the fuse could blow. You can replace the fuse and hope it was just a glitch. However, if the fuse continues to blow, there’s a bigger problem occurring. 3. Vehicle Overheating. The purpose of the radiator fan is to cool the vehicle.Dec 7, 2022 · AC running without coolant fan coming on. I have a 2012 Chevy Cruse LT. It is my understanding from a mechanic and these forums that the coolant fan should be running when the AC is turned on. It currently is not and the mechanic can find no reason why. The dealership even indicated they were not aware of any issues. Yes, the radiator fan should turn on when the ac is on as it helps to cool the refrigerant and maintain proper engine temperature. When the ac is turned on, the …Both radiator fans should always run when the AC compressor is engaged. To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees.The fan accomplishes this by drawing cooler air through your vehicle’s radiator when the car isn’t moving fast enough to do so naturally. When the engine hits a certain temperature, typically between 200-230 degrees Fahrenheit (93-110 degrees Celsius), the radiator fan springs into action. However, the precise temperature can vary depending ...Are you saying that with the cabin heater/AC fan turned Off, the radiator fans don't come on when the OBD-indicated temperature rises above 212 F? Whether or not there's a flow problem, the fans should be turned on by the ECM when the coolant temperature is high, without having to turn on the AC.The fan issue sounds like burnt relay contacts at the fuse box. This is a common problem on these cars. When you undo the hex bolts that hold the fuse box, you can pull off the top half and inspect the connection points. If anything looks corroded/burnt, its time for a new box. 2007 Mustang GT/CS coupe.Can I manually turn on the radiator fan if it doesn’t activate with the AC? In some vehicles, it may be possible to manually turn on the radiator fan by using the fan control settings or overrides. However, it is recommended to have the issue diagnosed and repaired by a professional to avoid potential complications. Can a faulty radiator fan ...The temp was 194 and steady. No cooling fans. Lower radiator hose cool to the touch. I revved the engine up to 2000 rpm for a couple on minutes. Temp rose to 200. Lower radiator hose finally hot, indicating that the thermostat opened. Still no fan running. I turned on the a/c with fan speed at 1. Both fans kicked on and cooled the coolant down ...The fan issue sounds like burnt relay contacts at the fuse box. This is a common problem on these cars. When you undo the hex bolts that hold the fuse box, you can pull off the top half and inspect the connection points. If anything looks corroded/burnt, its time for a new box. 2007 Mustang GT/CS coupe.In this setting the cabin blower will be on, but the radiator and ac condenser fans should be off. If the rad & condenser fans are still running check the AC compressor clutch and see if its engaged, if so the climate control panel might be fubared and is constantly telling the rest of the car to run the AC regardless of the controls setting ...A dirty radiator. The radiator may need a thorough cleaning if the fan is always on when the car air conditioning (AC) is also on. Bad or broken wiring. Wrong wiring or broken wiring can cause a short circuit. Observe the insulation on the fan wires to check for signs of frays or damages.Hook the Center wiper of your switch to a good , properly bonded ground. The normally open side will go to the FAN MOTOR side of the switch (or the relay coil side of the switch, if using a relay). In this configuration, it will turn ON any time you flip the switch. Doc imp: The radiator fan should turn on when the AC is on in most vehicles. This activation helps manage the additional heat generated by the AC system, aiding in maintaining the engine’s optimal temperature. However, factors like vehicle design, ambient temperature, and system health can affect function. Bleed the air out first of cooling system and then check if fans come on. If not do not waste anymore time and money!!! This relay saved my engine from overheating!!! Vehicle: 2000 Chevrolet Malibu Auxiliary Fan Control Unit Engine Cooling Fan Controller -- Premium adjustable fan control with push in probe that installs in the radiator fin section.When the engine is cold the ETC switch should be closed ( that opens the radiator fan #1 relay) keeping the fan from running. When the coolent is hot, the ECT switch should be open ( closing the #1 relay) and allowing the fan to run. The second connector you found ,is probably it.The sensor on the radiator only controls the fans, it should turn on the fans at 196 - 203 F. The sensor on the engine is used by the gauge and the ECM, that is the measurement called ECT on a scanner. That temperature is controlled by thermostat, the cooling fans help transfer the heat away from the engine. Typically the fans do not run while ...

The temp was 194 and steady. No cooling fans. Lower radiator hose cool to the touch. I revved the engine up to 2000 rpm for a couple on minutes. Temp rose to 200. Lower radiator hose finally hot, indicating that the thermostat opened. Still no fan running. I turned on the a/c with fan speed at 1. Both fans kicked on and cooled the coolant down .... Aa2177

should radiator fan turn on when ac is on

Days of Our Lives, often abbreviated as DOOL, is a beloved American soap opera that has captivated audiences for over five decades. With its dramatic twists and turns, complex char...Start your vehicle, and let it idle for 10-15 minutes. Depending on the ambient temperature in your location, this should be long enough for the coolant temp to get hot and the thermostat to open up. Watch the vehicle and see if the cooling fan comes on. Driving your car is a good way to get the coolant temp hot.There are 2 fans. Cooling fan and AC condenser fan. Right side is the condenser fan and left side is the cooling fan for your cooling system (not too sure). Which one isn't running? Your Cooling fan should not turn on if your engine is not over operating temperature threshold.The condenser fan (if it has a dedicated fan) or the radiator fan most always comes in (with AC on) when the compressor discharge pressure (or, alternatively, the liquid line one; look for where a sensor or a switch is located on the high pressure line) rises over an operative threshold.The radiator fan should turn on when the AC is on for optimal cooling performance. Here are 5 key facts that reveal why this is important. Fact 1: The Radiator Fan Should Turn On When The Ac Is On: The radiator fan plays a crucial role in maintaining the engine temperature, especially when the AC is on. ...WTF is wrong with you!!! BMW-N your info on the electric fan was interesting and helpful. I know the fan works because it is usually on high speed turbo when the AC is on. When the AC is off it seems to operate normally and my coolant temps are normal so I think I'm ok for now on the waterpump.The temp was 194 and steady. No cooling fans. Lower radiator hose cool to the touch. I revved the engine up to 2000 rpm for a couple on minutes. Temp rose to 200. Lower radiator hose finally hot, indicating that the thermostat opened. Still no fan running. I turned on the a/c with fan speed at 1. Both fans kicked on and cooled the coolant down ...A radiator fan only turns on when the air conditioning system is switched on because the AC compressor requires additional cooling to prevent it from overheating. The radiator fan helps cool down the engine and other components of the car by blowing air over them, thus preventing damage due to excessive heat.The most common causes of why a radiator fan is not working are a blown fuse, a bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged. While these are some of the reasons, the list is not exhaustive. Here is a more detailed list of the most common causes of a ...The fan accomplishes this by drawing cooler air through your vehicle’s radiator when the car isn’t moving fast enough to do so naturally. When the engine hits a certain temperature, typically between 200-230 degrees Fahrenheit (93-110 degrees Celsius), the radiator fan springs into action. However, the precise temperature can vary depending ...14 Aug 2006 ... (The fan should be called the condenser fan. Like all other direct injection diesels that I have owened, the fan is never needed by the engine.Most a/c installations with a trinary switch will never have the fan running when you're cruising at 60-70 mph. Just as it would with the a/c off. In the a/c system high pressure = high termperature. There is no reason to turn the fan on unless there's high temperature. If the fan runs all the time, it just wears it out that much quicker.17 Aug 2012 ... Radiator fan wont turn on automatically, but works with AC. · Mazda 3 Service Manual - Engine Coolant Temperature (ECT) Sensor Inspection [Mzr ...Today I took let the car idle for a while, neither fans turned on. I drove around for about 10 or 15mins at low speeds and then let the car idle again. Periodically the A/C condenser fan would turn on and off to cool the engine, but nothing happens with the radiator fan. Keep in mind that the A/C is completely off during this time. My questions:So he replaced bot motors, fans, and my broken radiator. I just picked it up and when I turn on my AC to full blast and fiddle with the air settings, I can only see the passenger side radiator fan turning. The Driver side won't come on. I idled in the summer heat for about 10 minutes after driving 10 miles in the heat. Both fans won't turn on.A radiator fan that is constantly on may be triggered by the air conditioning when it is on. Be sure the air conditioning is off. If the radiator fan is still constantly on, it is most likely caused by the fan relay being stuck closed. Replace the fan relay. If this is not the issue the temperature sensor or ECU may have a problem..

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