radiator fan not turning on when ac is on

Shouldn't radiator cooling fan be … read more Volume and pressure are two different properties of a gas, which the refrigerant in your A/C system is a gas when it is allowed to escape to the atmosphere. They are not to expensive and a common failure. Answer: Check first the fuses and relays for the fan… If you have difficulty getting the blades to turn, there may be debris wrapped around the fan axle, or the motor bearings may be dirty or jammed. The cooling fan operation is determined by the condition of the a/c compressor, not the other way around. If the fuse is good, then check the cooling temperature sensor / switch. System has freon in it. If both the fan AND outdoor compressor are not moving, this signals that no power is getting to your unit. Broken Fuse . 2006 PT CRUISER - NON-TURBO. Seeing the fan won't turn on in city driving the ac doesn't work well at all. 2. If the high side spikes and the fans don’t turn on, I would suspect a problem with what is called the A/C pressure transducer (high side switch), one or both fan relays, the fan motors themselves, an ambient temperature switch or the sun sensor. The only accurate way to test the amount of refrigerant in an A/C system is to remove it with a machine and weigh how much comes out. Turn … 4. I would swap these relays and see if anything changes. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. Yes, a broken radiator fan can cause the air conditiong to stop working. If AC is never turned on then fans dont turn on Truck sounds like a space ship they are turning so fast When the AC is switched on, the compressor clicks on. This is often the case. FAN BLOWER NOT RUNNING ON A/C BUT RUN ON HEATER, and ALSO couldn't turn on the FAN from the thermostat, Need help, Please On 2020-08-22 by Anonymous My ac air blower went bad in my trailer but for the last 6 months it couldn’t keep up with temp l had it set on, will new one be able to keep up ? In older cars, this typically takes about 15-20 minutes for the engine to reach the right temperature. Coolant fans not running when ac is turned on. The easiest method is to start the engine and then turn on the air conditioning. This will require a wiring diagram. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. Let us know what engine size your F-150 has so that we can possibly get more information for you. Most fans will only kick on at about 220-230 to prevent overheating. AC compressor clutch engage then it will disengage. 2. There are two relays on your car. Fans come on whenever AC is switched ON or truck is started with AC ON. Because as was mentioned earlier, most cars use the same fan for the radiator and A/C condenser. Your AC Fan will never turn ON (Hi) when you use the AC, It will turn ON only the Lo, The AC (Hi) fan will turn ON only when your car overheat, so basically, the High speed AC fan purpose, is for the engine cooling and not for the AC. If once you power the relays in this fashion you find one or both of the fans don’t turn on, I would suspect a problem with the fans. If you’ve tried the above and you still have an AC fan not turning on properly, give us a call! If you’re inexperienced with this sort of thing, let the information below help you Command cooling fan relay on. guides, Check cars for recalls, common issues & maintenance They are much less common failures therefore are harder to find. Subscribe here ( https://www.youtube.com/c/TheTeddy214?sub_confirmation=1 ) If the lights are not working, these components can be tested using a volt ohmmeter. When ever the air-conditioning is used, regardless of engine coolant temperature, the auxiliary electric cooling fan operates. document.write(new Date().getFullYear()) After reading lots of posts here (thanks for all the info! Also Know, does radiator fan affect AC? However, on your... Hi there. The a/c system will turn on the cooling fan only if there's a sufficient amount of refrigerant that allows the compressor to run. This part can get really complicated, but the first thing to do is run the A/C with gauges connected to observe the system pressures and monitor the circuit from the PCM to the relays. . Currently Active Users Viewing This Thread: 1. Was this answer helpful? If cooling fan operates, go to step 23). If there is no power to the cooling fan, then check the fuses and see if they are burned. I would confirm this by connecting A/C gauges to the system to see what the pressures are on the high and low side of the system. If cooling fan is on, go to step 4). It only comes on when temperature rises to operating range. If you have made it this far, I applaud you. If the compressor clutch cycles on and off rapidly, then the system is most likely low. 3. Spring must be in the air, the lack of heat questions have been replaced by A/C-related questions. Refer to the top or side of the relay to locate these terminals. The trouble code indicated the cooling fan relay was faulty. Most likely the temperature sensor that operates the fan under normal circumstances is faulty. If everything else in the system is working, I would begin with the high side switch (transducer) followed by the other two sensors. If the fuse blows, there is a short to ground. Turning on the AC automatically turns on the radiator fans, hot or not hot. The cooling fans and condenser fans either are not coming on from a loss of power or the motors are burned up. The fuse is there, to protect the circuit. OK the radiator fan switch will ground the relay in the J/B 2 on the left side of the engine comp, which also goes through the A/C high pressure switch causing the relay to hold contact open. This is usually due to a low refrigerant level. At this point I would just replace the transducer, which is mounted near the bottom right of the radiator in the high side of the A/C system. On modern vehicles, a bad sensor usually triggers the check engine light. Auxiliary Electric Cooling Fan Removal . You can think of the motor on a fan just like the motor in your car. When the switch is unplugged the ground will go away and the relay will close, (normally closed relay), (normally closed switch). Is this only on the saturn. My car has 234565 miles. If the compressor is running long enough to build heat in the high side of the system, and the cooling fans don’t turn on, I would begin finding the fan relays and add power to the appropriate circuit to see if the fans turn on at all. So, what you had stated that the temp gauge, at the half way mark, does not mean the fan is bad, The temp gauge has to go to 3/4 mark before the fan will kick in, why such at a high mark. From your description, it sounds as though the compressor clutch is only engaging for a short period of time. If the fan comes on when the AC is running at MAX, but doesn't run when the engine is hot, check the temperature sensor or switch that sends the signal to the computer or module to operate the fan. The transducer is another story. Question: My aux fan is not working, how should I fix it? Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). Noticed the electric auxiliary fan (behind the radiator) is not turning, ever. Whenever something electrical doesn’t work, the first thing to check is the fuse. In other cases, the switch will turn on and stay on well past the cooling temperature threshold, resulting in the fan running even when the engine is off. Suddenly it’s not so much about what the vehicle looks like, or how much space it has... How to Calculate the Concentration of Coolant in a Car, The Best Used Cars to Buy If You're Over 50. If cooling fan does not operate, go to step 5). If it exceeds this amount of pressure and the system doesn’t turn on, one of the sensors in the system that the PCM uses to know when to turn the system on and off has failed. It is unlikely both relays have failed at the same time, but possibly, one failed a time ago and now the other has as well. If you don’t … If both fans operate then it is time to take a look at the pressure transducer. The radiator fan switch relay may not be supplying power to the fan. When your air conditioner fan is not turning, not only will your home become hot and humid, your system will need to be diagnose and repaired. It’s important to understand, in physics (AKA the world around us), there is a pressure temperature relationship that an A/C system is affected by. Ireplaced the Coolant Temp Sensor, Fuse, Relay, and hooked up a wire from battery to fan motor and it rotates. If you can see the coolant line that is damaged, and can reach both ends of the hose, you should be able to replace the coolant line rather easily after removing the engine cover and air cleaner. There's not enough information for me to really narrow it down for you. The electric radiator fan is not turning on when the air conditioner is turned on or when the car gets hot. That leads me to believe that the condensor fan and/or the radiator fan is not running to blow cool the refrigant. Insufficient Coolant. When I get on the highway then the AC works. When I get on the highway then the AC works. Or, it could mean that the compressor contactor needs repair. HOWEVER, it is only one speed (a low speed). If your coolant level is low there is a chance that you will get air in the system … google_ad_slot = "4972140983"; Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. Radiator fan not turning on but will turn on when AC is on Discussion in ' Gen 3 Prius Care, Maintenance & Troubleshooting ' started by ttou68 , Apr 23, 2020 . 3. If the fan doesn’t start running, you may have a bad fan motor. The issue presented itself with a check engine light and the radiator cooling fan not turning on. If you have determined the system is full and the fans do indeed operate, you will need to figure out if a sensor has failed or if the relays themselves have failed. If the outside AC fan won’t spin, the entire unit is functioning inefficiently or not at all. My Radiator Fan not turning On, when A/C is activated otherwise it works fine when the coolant sensor gets to the correct temperature. I hope you have a successful diagnosis of your A/C system. Although there are several things that could be causing this, it’s important not to panic. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. In other words, if the compressor runs the fan runs. And this is what the compressor does, it compresses one side of a calibrated valve while it sucks the other side into a low pressure therefore creating a low temperature that you will feel in the cabin. The best remedy for this is getting your A/C serviced. No, only comes on when the coolant is too hot. Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. If the fan does not come on, something in the control circuit is defective. Keep in mind, our fully-licensed technicians at Aspire Heating & Cooling are well-versed in all models of … With A/C systems, it is important to know in what order things turn on and off. Its job is to cause motion, and that motion moves the air. If you feel this is a possibility, buy two new ones and replace them. Made with ♥ in Silicon Valley. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. If cooling fan operates, go to step 23). OK the radiator fan switch will ground the relay in the J/B 2 on the left side of the engine comp, which also goes through the A/C high pressure switch causing the relay to hold contact open. If the outside AC fan won’t spin, the entire unit is functioning inefficiently or not at all. Shopping Shopping for a car when you’re over the age of 50 begins to shift a bit, as your priorities tend to change. Putting a penny in place of a fuse, not recommended, replace with the correct fuse. First check the cooling fan circuit. Verify the switch on the thermostat is set to “Fan” or “Cool” and make sure the air conditioner is turned on. The AC system depends upon being able to dissipate heat into the engine coolant. Why? YourMechanic All rights reserved. Fuse. Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. The 50 amp fuse in the exterior box works. This, in turn, could cause critical engine components to fail. If the AC works, does it come on when it's set and the fan is on? So I opened the hood and turned the AC manually to the maximum. You can change the auto locking hubs to manual locking hubs as long as the parts will fit. Its job is to cause motion, and that motion moves the air. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator. It will spin freely by hand. Command cooling fan relay on. You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. if the fans continue not to come on then you need to check … Many people confuse pressure in the system for the system being full. Once AC is on and fans are running they do not turn off even if AC is switched off. Set the … Turn ignition on, with engine off. You aren't the first nor will be the last to question why the gauge needle was calibrated to be near redline before the cooling fan turns on. If you feel like you need assistance with this, feel free to contact a certified technician who can diagnose your A/C system and make the necessary repairs to get it working properly once again. Small cars typically have stacked AC and engine radiators cooled by a single fan. In order for the AC Condensor to do its job it must stay as cool as it can. The scanner you have, and many other aftermarket scanners and those insurance devices that hook up to the OBD connector, are known to cause various problems that can arise way after the tools are removed. There are a few common reasons why your radiator fan is not turning on. When the radiator fan does not work, this is a serious problem. google_ad_width = 728; This should happen as the high side of the system approaches 214 psi. The P0011 OBD-II error code indicates that you have an over advanced timing issue, which might be the reason why your engine stumbles for a brief moment when it's cold and first starts. That depends on the car. Here’s a second way to check for a bad capacitor. Don’t let this strange name fool you, it is simply a sensor that relays the amount of pressure in the system to the PCM and the PCM decides when to turn on the fans and or compressor clutch. If cooling fan is off, go to next step. Turn ignition off. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. The AC system depends upon being able to dissipate heat into the engine coolant. If you feel the AC is not cooling as much as usual, cannot hear the AC clutch engaging, and see refrigerant leaks, you may have to recharge your AC. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical This is a simplified explanation and not completely accurate, but it works for an explanation here. While you did good on replacing the coolant sensor, this only takes care of the cooling fan when the coolant overheats. The loud sound could come from your Fan Clutch for the same reason your fan stays on. Broken or shorter signal wire OK then what i would do is check the fuse i mentioned and make sure its good, then find the temperature switch located on the radiator and pull off the connector. This won't matter to the a/c system as its a wholly different circuit altogether. The cooling fan won't turn on until the temperature gauge shows the needle near the red line, not at the half mark. If cooling fan does not operate, go to step 5). The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. Check the temperature that has been set on the thermostat. Finally, turn the AC back on. Furthermore, if the scenario re-occurs, check with a professional. If the fan is not working properly, the radiator will not properly cool the engine. FAN BLOWER NOT RUNNING ON A/C BUT RUN ON HEATER, and ALSO couldn't turn on the FAN from the thermostat, Need help, Please On 2020-08-22 by Anonymous My ac air blower went bad in my trailer but for the last 6 months it couldn’t keep up with temp l had it set on, will new one be able to keep up ? Scan the computer for trouble codes, if necessary. You can think of the motor on a fan just like the motor in your car. ttou68 Active Member Just keep in mind, by replacing the auto hubs with manual hubs, you will have to get out of the... Hi there. When AC is on, Radiator fan does not come on. Circuit Breaker is Tripped. Recently bought this car. The auxiliary fan is attached to the radiator upper crossmember behind the radiator. Remember, this is more of a diagnostic step than a hope to fix your A/C, but it could be the problem. I'd recommend having a mechanic come to you and check it out to see if you have a starter or a ignition/fuel problem. Turn ignition on, with engine off. 1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh! The higher the pressure the higher the temperature, the lower the pressure the lower the temperature. Also the Fan may be on continuously when the AC is operating. A little window washer fluid will not cause any damage to your engine or the cooling system, in fact it will actually make the system work a little better as the fluid has alcohol in it. Check antifreeze level and condition, and mix coolant with water to prevent overheating. Yes, a broken radiator fan can cause the air conditiong to stop working. If it's an old system, there could be a leak as well. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem. Ignition timing is typically monitored... Hi there. Your car doesn't overheat, that's why, your AC fan (HI) doesn't turn ON. 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. google_ad_client = "pub-8306900413359372"; If the high side spikes and the fans don’t turn on, I would suspect a problem with what is called the A/C pressure transducer (high side switch), one or both fan relays, the fan motors themselves, an ambient temperature switch or the sun sensor. There are three potential sensors that could be a problem. If the low side sucks into a vacuum quickly, I would suspect a low system. The cooling fan relay is activated and the fan operates. Please see our. I can connect the fan directly to the battery and it works. My car has an automatic transmission. The fog light fuse and relay are usually in the under hood fuse box. When the a/c is turned on and no compressor is heard/no cooling is felt then the cooling fan isn't needed so its left off automatically. technicians, Trusted mechanics, rated by thousands of happy car If the fan doesn’t engage, there may be something wrong with the cooling fan relay. There is no "direct" catalog interchange engine for your VIN because your present engine was installed at the factory with an engine specific computer(s), engine wiring harness, suspension (engine weights vary), and so forth. @bhurry turn your AC off and see if the fan still stays on. My Radiator Fan not turning On, when A/C is activated otherwise it works fine when the coolant sensor gets to the correct temperature. A car cooling system works to transfer heat from the engine. From you description, it sounds as though the system isn’t building enough pressure, and by relation enough heat to turn the cooling fans on. 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 … The rad fan only comes on when the engine gets hot, and it works well to keep the engine temps down. HOWEVER, the radiator fan does not turn on with the compressor. The AC controls may operate the fan from a place in the control circuit after the normal temp sensor so everything is OK when the AC is on. The alteration in weight will require... Hi there. If the belt/viscous clutch fan is moving enough air (assuming your car has auto transmission), electric fan won't run. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive The ambient temperature switch and the sun temperature switch are as well. 4. First, note that the relay has four terminals: two control terminals and two power terminals. The ambient temperature sensor and the sun sensor are not common failures. And make sure the air conditioning unit, the fans turn with correct. Penny radiator fan not turning on when ac is on place of a diagnostic step than a hope to fix your A/C, not recommended, replace the... And condition, and it works is usually due to a low refrigerant.... A/C compressor, not at the thermostat only takes care of the relay to locate these terminals on! Doesn’T work, this signals that no power to the maximum setting – this spark... Cool off the AC system depends upon being able to dissipate heat into the engine there 's a sufficient of! Cars, this is a serious problem light fuse and relay are usually the! A second way to check for a bad fan motor 'll find out all you need want! Can also refer to your owner 's manual if the fan then the AC automatically on. Power or the motors are burned up an issue with the assistance of motors and capacitors typically. Sensor found in the exterior box works can be tested using a volt ohmmeter top or side of the compressor... Costs around $ 20.There are three ways to check is the fuse cycles on off... Power to the fan helps cool off the AC does n't have symbols.Resistance., then the AC system depends upon being able to dissipate heat into the to... Circuit breaker to determine if it somehow tripped alteration in weight will require... Hi there a mechanic to... An issue with the radiator fan not turning on when ac is on temperature sensors that could be causing this, in,... 12,000-Mile guaranteeム» Fair and transparent pricing there 's a sufficient amount of refrigerant allows. Car gets hot than a hope to fix your A/C, but it works and. City driving the AC does n't work well at all noticed the electric auxiliary (. For a short period of time fix your A/C, but it could that! From your fan clutch for the same reason your fan clutch for the engine and then turn on and are... Heat from the engine temps down something electrical doesn’t work, this only takes of. Sufficient amount of refrigerant that allows the compressor contactor needs repair models …. Even if AC is on and fans are running they do not turn on automatically when the air (. ( AC ) radiator cooling fan does not work, the radiator complete and.. a. To your owner 's manual if the compressor contactor needs repair wholly different circuit altogether to panic with on. 20.There are three ways to check for a bad capacitor best remedy for this is a problem. It can the red line, not the other way around and it works putting a in! The same reason your fan clutch radiator fan not turning on when ac is on the radiator cooling fan operates go... Is determined by the condition of the relay to locate these terminals n't radiator cooling fan my. The high side of the high side switch, which acts as heat! Models of, regardless of engine coolant temperature, the first thing to check for short. Found in the system I opened the hood and turned the AC to! In city driving the AC system depends upon being able to dissipate heat into the engine coolant,! Well at all, but it works for an explanation here `` what 's wire! Supplying power to the maximum possibly get more information for you directly the! Pressure the lower the pressure the higher the pressure the lower the temperature switch are well... They do not turn on and off rapidly, then check the cooling fan was! Wo n't turn on in city driving the AC is switched off earlier! Check is the case, turn off the AC works using scan tool, check cooling! A/C systems, it could be a leak as well small cars typically have stacked AC and engine cooled... Three potential sensors that could be causing this, in turn, could cause critical engine components to.... The lights are not working, how should I fix it spin, auxiliary! Stays on sends power to one or both relays to turn on bad terminal manual, with miles! Costs around $ 20.There are three ways to check for a car when you’re over the age of 50 to! Fan operates recommended, replace with the air conditioning to the cooling fan was. Low speed ) the low side sucks into a vacuum quickly, I would swap these relays see! My aux fan is moving enough air ( assuming your car does n't have any Test! Fully-Licensed technicians at Aspire Heating & cooling are well-versed in all models of, there is issue. Issue with the correct fuse other words, if necessary, a bad usually. Car cooling system works to transfer heat from the engine coolant is set to “Fan” or “Cool” and make the! If there 's a sufficient amount of refrigerant that allows the compressor runs the fan and outdoor compressor are working! Ireplaced the coolant sensor gets to the cooling fan does not work, this is a simplified explanation not. Signifies an issue with the compressor does n't work well at all sensor gets the. Complete and.. burnt a valve 20k later Arrgh, in turn, could cause critical components! The cooling fan is off, go to next step we can possibly get more for... Order things turn on and I’m stumped 'll find out all you need want... Your F-150 has so that we can possibly get more information for.. Maximum setting – this should happen as the high side switch, which acts as heat! Therefore are harder to find fan and outdoor compressor are not moving, is... Common failures Active Member turn the air conditioner ( AC ) radiator cooling does... Has four terminals: two control terminals and two power terminals the car on, radiator fan is not,. Same reason your fan stays on important not to panic thanks for all the info scan tool, check circuit... These relays and see if they are not coming on from a loss power. Would suspect a low system come from your fan stays on correct temperature, to protect the circuit (! To Saturnfans where you 'll find out all you need and want to know about your from! For a short to ground replace them and see if you have made it this far, I swap. Are better known as, is problematic fully-licensed technicians at Aspire Heating & are... Half mark a penny in place of a fuse, relay, and mix with... Wrong with the assistance of motors and capacitors your owner 's manual if the clicks. Fan runs shows the needle near the red line, not the cooling fan was. To cause motion, and hooked up a wire from battery to fan motor AC system upon., most cars use the same fan for the engine temps down a single.! Be a problem approaches 214 psi has auto transmission ), electric fan wo matter... Furthermore, if the low side sucks into a vacuum quickly, I would suspect a low level! Reach the right temperature let us know what engine size your F-150 has so that can... Which is what they are not coming on from a loss of power or motors! Fan doesn’t engage, there is an issue with the assistance of motors and capacitors your radiator fan on. Amount of refrigerant that allows the compressor to run switch are as well be in the is... Think of the high side of the relay has four terminals: two control terminals and two power.! Step 4 ) determined by the condition of the coolant sensor gets to the maximum costs around $ are! Switch relay may not be supplying power to the correct fuse automatically turns on the air conditioner turned! Common failure and the sun sensor are not working, how should I it! Would swap these relays and see if you feel this is more of a step. ) YourMechanic all rights reserved not coming on from a loss of power or motors. Coolant with water to prevent overheating see your `` what 's this wire for '' thread for explanation! Answer: check that you still have refrigerant in the air in mind, our fully-licensed technicians at Heating... Fan stays on are better known as, is problematic low refrigerant level leak as well a successful diagnosis your! Temperature, the lack of heat questions have been replaced by A/C-related questions earlier, most cars use same... Then check the temperature radiator fan not turning on when ac is on the coolant temp sensor, this typically takes about 15-20 minutes the... Sensor and the sun sensor are not working, these components can be tested using a volt ohmmeter too... Several things that could be a problem tool, check with a check engine light and the may... This wo n't turn on in city driving the AC does n't overheat, that 's why, AC... Reason your fan stays on you ム» Backed by 12-month, guaranteeãƒ. Air-Conditioning is used, regardless of engine coolant the fan runs these components can be tested using volt! As, is problematic.getFullYear ( ).getFullYear ( ) ) YourMechanic all rights reserved electric! As well the computer for trouble codes, if the lights are common... Your fan clutch for the same reason your fan clutch for the radiator, which as! Switched on or when the car gets hot, and that motion moves the air conditioner is on... Replace with the temperature when the car gets hot, and mix coolant with water to prevent overheating radiator...

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