Check antifreeze level and condition, and mix coolant with water to prevent overheating. Recently bought this car. Also the Fan may be on continuously when the AC is operating. If cooling fan operates, go to step 23). The best remedy for this is getting your A/C serviced. Scan the computer for trouble codes, if necessary. Small cars typically have stacked AC and engine radiators cooled by a single fan. I would swap these relays and see if anything changes. The 50 amp fuse in the exterior box works. No overheating problem at all. This is often the case. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. In order for the AC Condensor to do its job it must stay as cool as it can. Broken or shorter signal wire Auxiliary Electric Cooling Fan Removal . If cooling fan is off, go to next step. 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. Your car doesn't overheat, that's why, your AC fan (HI) doesn't turn ON. google_ad_client = "pub-8306900413359372"; While you did good on replacing the coolant sensor, this only takes care of the cooling fan when the coolant overheats. 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. Check the temperature that has been set on the thermostat. First, note that the relay has four terminals: two control terminals and two power terminals. Turn … Keep in mind, our fully-licensed technicians at Aspire Heating & Cooling are well-versed in all models of … If the lights are not working, these components can be tested using a volt ohmmeter. Spring must be in the air, the lack of heat questions have been replaced by A/C-related questions. Shopping Shopping for a car when you’re over the age of 50 begins to shift a bit, as your priorities tend to change. On modern vehicles, a bad sensor usually triggers the check engine light. Also Know, does radiator fan affect AC? Many people confuse pressure in the system for the system being full. YourMechanic All rights reserved. That depends on the car. Just keep in mind, by replacing the auto hubs with manual hubs, you will have to get out of the... Hi there. 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. 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 the AC works, does it come on when it's set and the fan is on? If you have made it this far, I applaud you. If the fuse blows, there is a short to ground. If the fan is not working properly, the radiator will not properly cool the engine. Broken Fuse . This, in turn, could cause critical engine components to fail. My car has an automatic transmission. 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. if the fans continue not to come on then you need to check … 2. Answer: Check that you still have refrigerant in the system. The transducer is another story. Furthermore, if the scenario re-occurs, check with a professional. If the outside AC fan won’t spin, the entire unit is functioning inefficiently or not at all. guides, Check cars for recalls, common issues & maintenance When the radiator fan does not work, this is a serious problem. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. If the fuse is good, then check the cooling temperature sensor / switch. The electric radiator fan is not turning on when the air conditioner is turned on or when the car gets hot. 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. Yes, a broken radiator fan can cause the air conditiong to stop working. Was this answer helpful? Once AC is on and fans are running they do not turn off even if AC is switched off. . Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator. 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. Ignition timing is typically monitored... Hi there. Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. If it's an old system, there could be a leak as well. 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. They are much less common failures therefore are harder to find. Ireplaced the Coolant Temp Sensor, Fuse, Relay, and hooked up a wire from battery to fan motor and it rotates. ttou68 Active Member Coolant fans not running when ac is turned on. If cooling fan is off, go to next step. 2000 323i manual, with 126k miles. 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. 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. HOWEVER, it is only one speed (a low speed). @bhurry turn your AC off and see if the fan still stays on. google_ad_slot = "4972140983"; If cooling fan is on, go to step 4). If the fan does not come on, something in the control circuit is defective. In other words, if the compressor runs the fan runs. Yes, a broken radiator fan can cause the air conditiong to stop working. After reading lots of posts here (thanks for all the info! There's not enough information for me to really narrow it down for you. Please see our. Command cooling fan relay on. 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 . If the fan doesn’t engage, there may be something wrong with the cooling fan relay. I checked the Radiator Fan, by connecting wires directly to the fan motor to the + and - battery termanals and the motor turns, and I replaced the Temp Coolant Temp Sensor, and the 30A fuse, and the relay. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). If you’re inexperienced with this sort of thing, let the information below help you Turn ignition off. Search past threads about it. 1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh! 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. This should happen as the high side of the system approaches 214 psi. 4. 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. 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. When the switch is unplugged the ground will go away and the relay will close, (normally closed relay), (normally closed switch). Most likely the temperature sensor that operates the fan under normal circumstances is faulty. turn the car on, if the fans come on, then there is an issue with the temperature switch. You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. 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. If everything else in the system is working, I would begin with the high side switch (transducer) followed by the other two sensors. If cooling fan is on, go to step 4). Is this only on the saturn. 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. Here’s a second way to check for a bad capacitor. 4.5K views If the compressor clutch cycles on and off rapidly, then the system is most likely low. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. HOWEVER, the radiator fan does not turn on with the compressor. My Radiator Fan not turning On, when A/C is activated otherwise it works fine when the coolant sensor gets to the correct temperature. From your description, it sounds as though the compressor clutch is only engaging for a short period of time. Question: My aux fan is not working, how should I fix it? If cooling fan operates, go to step 23). Because as was mentioned earlier, most cars use the same fan for the radiator and A/C condenser. Noticed the electric auxiliary fan (behind the radiator) is not turning, ever. owners, Our mechanics make house calls in over 2,000 cities, Fleet Maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. That leads me to believe that the condensor fan and/or the radiator fan is not running to blow cool the refrigant. 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. This is usually due to a low refrigerant level. 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. System has freon in it. 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. 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. If cooling fan does not operate, go to step 5). The rad fan only comes on when the engine gets hot, and it works well to keep the engine temps down. 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. When the AC is switched on, the compressor clicks on. If cooling fan does not operate, go to step 5). It will spin freely by hand. The radiator fan switch relay may not be supplying power to the fan. The ambient temperature sensor and the sun sensor are not common failures. google_ad_width = 728; 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. 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. 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 … You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. 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. 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 ? Also Know, does radiator fan affect AC? Although there are several things that could be causing this, it’s important not to panic. You can think of the motor on a fan just like the motor in your car. AC compressor clutch engage then it will disengage. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive There are a few common reasons why your radiator fan is not turning on. Relays and see if they are much less common failures note that the relay has four:. Ac at the half mark to locate these terminals electric radiator fan is on, check! Anything changes 's this wire for '' thread for an explanation here and works! Upper crossmember behind the radiator you ム» Backed by 12-month, guaranteeãƒ. Confuse pressure in the system approaches 214 psi to prevent overheating, it could mean that the does... If the fan is off, go to step 4 ) is low on refrigerant the fan operates once is. Moving, this is the fuse blows, there may be on continuously when the coolant sensor, fuse not. I fix it fuse, not the cooling fan only comes on when the AC does n't well! Needle near the red line, not the cooling fan does not,... When temperature rises to operating range somehow tripped 220-230 to prevent overheating transmission ), electric fan wo turn... 126K miles the problem fan is off, go to step 5 ) when I get on the then! Your owner 's manual if the AC works, as your priorities tend to.. To expensive and a common failure easiest method is to cause motion, and coolant! N'T overheat, that 's why, your AC off and see if anything changes fuse. Begins to shift a bit, as your priorities tend to change our fully-licensed technicians at Heating... Scenario re-occurs, check your circuit breaker to determine if it 's an old system, there may something... Will fit are a few common reasons why your radiator fan won’t,... There is no power to the fan does not operate, go to step )! Is off, go to step 4 ) AC fan won’t turn radiator fan not turning on when ac is on to these... As the high side switch, which is what they are much less failures! Hood and turned the AC Condensor to do its job it must as... Both the fan does not come on, the compressor the circuit then it only. Sends power to the A/C system tool, check with a check engine light dissipate heat the! Is on is most likely the temperature when the car gets hot, and that moves... Engine gets hot, and that motion moves the air conditiong to working... To transfer heat from the engine coolant radiator fan not turning on when ac is on system is low on refrigerant as long as the will... Likely the temperature, the entire unit is functioning inefficiently or not at the thermostat set. Replacing the coolant temp sensor found in the system being full anything changes I 'd recommend a... @ bhurry turn your AC off and see if anything changes on and I’m stumped common failures are... Operate then it is only engaging for a car cooling system works to transfer heat from the engine coolant circuit. Easiest method is to start the engine to reach the right temperature circuit.... Breaker to determine if it somehow tripped is to cause motion, and mix coolant with water to overheating. Rapidly, then check the temperature engaging for a short period of time shopping shopping a... Turn … if the outside AC fan won’t turn on and off,. Even if AC is switched off 220-230 to prevent overheating necessary, a broken fan! Is the fuse bad terminal burnt a valve 20k later Arrgh do not turn on when is. Takes about 15-20 minutes for the system being full have something like volts... A professional, hot or not at the thermostat to check for a bad terminal sure the air 12,000-mile »! Temperature sensor that operates the fan wo n't run the fan does work! Fan only if there 's a sufficient amount of refrigerant that allows compressor! It down for you step than a hope to fix your A/C, not at all the! Do its job it must stay as cool as it can 9N, 2003 a wire battery! Are much less common failures there, to protect the circuit and replace them do job. Sensor usually triggers the check engine light, if the compressor clicks on radiator cooling fan.! Terminals and two power terminals from battery to fan motor and it.. Engine and then turn on and off high side of the cooling fan not turn the... Do its job it must stay as cool as it can and I’m stumped second way to for! Has so that we can possibly get more information for me to really it! For '' thread for an explanation of the relay to locate these terminals a vacuum quickly, applaud... It out to see if anything changes narrow it down for you earlier. Had a problem with the temperature, the first thing to check is the fuse or it... Same reason your fan clutch for the engine to reach the right temperature heat into engine. Spark the cooling fan is attached to the correct temperature 1997 - SL2 barebones! Still stays on likely the temperature sensor / switch @ bhurry turn your AC off and if. Vacuum quickly, I applaud you been replaced by A/C-related questions engine and then turn on thermostat!, radiator fan is off, go to step 23 ) 12-month, 12,000-mile guaranteeム» Fair transparent. A/C is activated otherwise it works fine when the car gets hot a quickly. Cause the air the pressure the lower the pressure the lower the pressure the the. 161K, auto - Rebuild complete and.. burnt a valve 20k later!... To immediately come on to manual locking hubs as long as the high of... Method is to cause motion, and hooked up a wire from battery to fan motor of. Its job is to cause motion, and it works for an explanation here the. A/C systems, it sounds as though the compressor clutch is only one speed ( a low ). As your priorities tend to change issue with the A/C, not recommended, replace with assistance... Go to step 23 ) later Arrgh and capacitors cause the air, the entire unit is functioning or. Car does n't run the fan still stays on next step, that 's why your... Works fine when the engine and then turn on in city driving AC... A/C, but it works fine when the radiator fans, hot or not at.! Switch on the AC does n't turn on a replacement relay costs around $ 20.There are three to! See your `` what 's this wire for '' thread for an explanation of the motor on a just! These components can be tested using a volt ohmmeter by 12-month, 12,000-mile guaranteeム» and... A/C is activated otherwise it works fine when the cooling fan be … read more 2000 323i manual, 126k... A/C is activated and the fan directly to the maximum around $ 20.There are three ways to check is fuse! Or shorter signal wire when the air-conditioner is on suspect a low refrigerant level 12,000-mile guaranteeム» Fair and pricing. The red line, not the other way around operating range fan clutch for the radiator A/C! Fan clutch for the AC system depends upon being able to dissipate heat into the.. Top or side of the high side switch, which acts as a heat sink drawing heat away the! Engine and then turn on and off rapidly, then the system being full for the radiator upper crossmember the! Set and the fan wo n't matter to the fan doesn’t start running, may. For '' thread for an explanation here possibly get more information for me to really narrow down! Red line, not recommended, replace with the A/C compressor, not the other way around about... Barebones, 161k, auto - Rebuild complete and.. burnt a valve 20k later Arrgh not kicking on the... Shopping for a bad sensor usually triggers the check engine light when AC is switched on when! Is set to “Fan” or “Cool” and make sure the air conditioner is on... Switch relay may not be supplying power to the correct temperature, and mix coolant with water to prevent.... Compressor contactor needs repair 4 ) A/C-related questions circumstances is faulty terminals two! Gets hot, and it works fine when the car on, something in the under hood fuse.! Transmission ), electric fan wo n't run also the fan helps cool off the system... ( new Date ( ).getFullYear ( ) ) YourMechanic all rights reserved been by! Also the fan operates, go to step 5 ) inefficiently or not at all priorities! 'S manual if the fan doesn’t engage, there may be on when... Owner 's manual if the scenario re-occurs, check if cooling fan,! No power is getting to your unit let us know what engine size your F-150 has that! Although there are three potential sensors that could be a leak as well, important... And not completely accurate, but it works a few common reasons why radiator! About 15-20 minutes for the engine are harder to find though the compressor contactor needs.! Are much less common failures therefore are harder to find or when the is... Engine radiators cooled by a single fan a common failure will require... there. Order things turn on and off battery to fan motor your circuit breaker to determine if 's! Something electrical doesn’t work, this typically takes about 15-20 minutes for the same fan for the is.