Good luck. If you’re inexperienced with this sort of thing, let the information below help you The AC system depends upon being able to dissipate heat into the engine coolant. 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. Noticed the electric auxiliary fan (behind the radiator) is not turning, ever. This is usually due to a low refrigerant level. The cooling fans and condenser fans either are not coming on from a loss of power or the motors are burned up. 1997 - SL2, barebones, 161k, Auto - Rebuild complete and.. burnt a valve 20k later Arrgh! YourMechanic All rights reserved. Basically, if the high side pressure gets too high in the high side of the system, the fans should turn on, if the pressure gets to low in the low side of the system, the compressor clutch should turn off. Verify the switch on the thermostat is set to “Fan” or “Cool” and make sure the air conditioner is turned on. 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. 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. The transducer is another story. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … ttou68 Active Member I have a 2006 Lincoln Town Car. This is a simplified explanation and not completely accurate, but it works for an explanation here. If the lights are not working, these components can be tested using a volt ohmmeter. If cooling fan is on, go to step 4). The electric radiator fan is not turning on when the air conditioner is turned on or when the car gets hot. If cooling fan operates, go to step 23). In other words, the system is low on refrigerant. Currently Active Users Viewing This Thread: 1. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. Ignition timing is typically monitored... Hi there. If the fuse blows, there is a short to ground. 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. document.write(new Date().getFullYear()) Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. Refer to the top or side of the relay to locate these terminals. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. 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. Remember, this is more of a diagnostic step than a hope to fix your A/C, but it could be the problem. Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. Subscribe here ( https://www.youtube.com/c/TheTeddy214?sub_confirmation=1 ) If both the fan AND outdoor compressor are not moving, this signals that no power is getting to your unit. 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. The radiator fan switch relay may not be supplying power to the fan. Broken Fuse . guides, Check cars for recalls, common issues & maintenance HOWEVER, the radiator fan does not turn on with the compressor. If cooling fan is off, go to next step. A high speed and a low speed. 4.5K views The loud sound could come from your Fan Clutch for the same reason your fan stays on. If cooling fan is off, go to next step. 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. 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. If the fan doesn’t engage, there may be something wrong with the cooling fan relay. If cooling fan does not operate, go to step 5). google_ad_height = 90; The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. 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. 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. The trouble code indicated the cooling fan relay was faulty. 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 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. Please see our. Turning on the AC automatically turns on the radiator fans, hot or not hot. Circuit Breaker is Tripped. Answer: Check first the fuses and relays for the fan… 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 ? Search past threads about it. Turn … The ambient temperature switch and the sun temperature switch are as well. Scan the computer for trouble codes, if necessary. Check antifreeze level and condition, and mix coolant with water to prevent overheating. I would swap these relays and see if anything changes. There are two relays on your car. Its job is to cause motion, and that motion moves the air. When the AC is switched on, the compressor clicks on. The fuse is there, to protect the circuit. Command cooling fan relay on. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come 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. 3. However, on your... Hi there. Why? It only comes on when temperature rises to operating range. Finally, turn the AC back on. Whenever something electrical doesn’t work, the first thing to check is the fuse. The easiest method is to start the engine and then turn on the air conditioning. If you’ve tried the above and you still have an AC fan not turning on properly, give us a call! 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. Fuse. Most fans will only kick on at about 220-230 to prevent overheating. If the fan does not come on, something in the control circuit is defective. The higher the pressure the higher the temperature, the lower the pressure the lower the temperature. If both fans operate then it is time to take a look at the pressure transducer. 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. There are a few common reasons why your radiator fan is not turning on. In older cars, this typically takes about 15-20 minutes for the engine to reach the right temperature. The best remedy for this is getting your A/C serviced. 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. You can change the auto locking hubs to manual locking hubs as long as the parts will fit. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. Answer: Check that you still have refrigerant in the system. 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. 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. 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. Because as was mentioned earlier, most cars use the same fan for the radiator and A/C condenser. 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 auxiliary fan is attached to the radiator upper crossmember behind the radiator. 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. 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. The AC system depends upon being able to dissipate heat into the engine coolant. 2006 PT CRUISER - NON-TURBO. //-->. With A/C systems, it is important to know in what order things turn on and off. 2000 323i manual, with 126k miles. When the radiator fan does not work, this is a serious problem. Question: My aux fan is not working, how should I fix it? That leads me to believe that the condensor fan and/or the radiator fan is not running to blow cool the refrigant. Seeing the fan won't turn on in city driving the ac doesn't work well at all. The ambient temperature sensor and the sun sensor are not common failures. This won't matter to the a/c system as its a wholly different circuit altogether. 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. No overheating problem at all. If cooling fan does not operate, go to step 5). Turn ignition on, with engine off. The cooling fan won't turn on until the temperature gauge shows the needle near the red line, not at the half mark. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). Is this only on the saturn. Made with ♥ in Silicon Valley. Check the temperature that has been set on the thermostat. There are three potential sensors that could be a problem. 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. 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. google_ad_width = 728; That depends on the car. A car cooling system works to transfer heat from the engine. If the AC works, does it come on when it's set and the fan is on? Shouldn't radiator cooling fan be … read more 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. 4. I have something like 12.4 volts coming in and going out of the module connected to the fan. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). Coolant fans not running when ac is turned on. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. From your description, it sounds as though the compressor clutch is only engaging for a short period of time. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator. Your car doesn't overheat, that's why, your AC fan (HI) doesn't turn ON. They are much less common failures therefore are harder to find. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. The 50 amp fuse in the exterior box works. Also Know, does radiator fan affect AC? If there is no power to the cooling fan, then check the fuses and see if they are burned. 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. Aspire Solves and Prevents Problems. It will spin freely by hand. Command cooling fan relay on. And welcome to Saturnfans where you'll find out all you need and want to know about your Saturn from members here. Ireplaced the Coolant Temp Sensor, Fuse, Relay, and hooked up a wire from battery to fan motor and it rotates. Here’s a second way to check for a bad capacitor. Initially, check your circuit breaker to determine if it somehow tripped. If you feel this is a possibility, buy two new ones and replace them. Inside your air conditioning unit, the fans turn with the assistance of motors and capacitors. After reading lots of posts here (thanks for all the info! Fans come on whenever AC is switched ON or truck is started with AC ON. Recently bought this car. It was working find but now nothin7. My radiator fan won’t turn on and I’m stumped! This should happen as the high side of the system approaches 214 psi.