In older cars, you might have a fusible link – this is wire within an insulated block of rubber. Thank you everyone and I will keep you posted of whatever my oversight has been. Then both fans work. On many modern vehicles, if you want to confirm whether your cooling fan is in working order, you can start the engine and let it idle. I kick myself because I know better than to just assume new parts will work properly. If you don’t have resistance values, but you are able to deduct that the Ohms values remain the same during cold and hot temperatures, you should replace the sensor in order to fix your radiator fan. Your going to need to check for power at the fan, the fan can still be failed and spin just fine by hand, considering you dont have high or low I would lean towards a fan or fan connector concern. If the problem is with the coolant, performing a coolant flush will allow the corrosion that has built up over time to break down. However, if there is an issue with the number of volts of electricity, then that usually means the wire needs to be replaced. Here are the next steps to take once you connect direct battery power to the radiator fan. Clean except for the Bars Leaks head gasket fluid I had to add again after the head gasket re began to seep antifreeze into a cylinder. The last case scenario when testing your radiator fan is when the fan doesn’t come on after the engine has been running for 20 minutes. The temperature switch on most vehicles is typically connected to your car computer, or your powertrain computer. They were fine. After all like you said just to get a few more miles out of it. First, you need to unplug the wiring connector. 2. Thank you for putting into words how the relays work. Checked the relays, only found 3 of them, still not working. The job of the radiator is to keep the coolant at the right temperature so that when it travels back to the engine, it is able to take on more heat, and prevent the engine from getting too hot. This one I did not test earlier thinking it was not involved. Almost seems like it has got to be crud inside the radiator where this normally closed COOLING FAN SWITCH screws into and is not opening the switch circuit when the coolant reaches the correct tempture. I noticed my fan never came on even with the ac set on max. If your wire has worn out due to environmental factors, like heat, it will need a replacement. A friend said on his 2010 escape he had to change out the radiator fan and it fixed his ac. If the fan comes on when the air conditioning is operating at maximum volume, but doesn’t run properly when the engine is warm or hot, then you might need to check the temperature switch. Flushing is not good enough. I repaced the coooling sensor twice and both were no good, so I went to a diferent store to try another one. I was on vacation in January. When the AC is powered On it takes over the control of the radiator fan motor to help cool down the water inside the radiator especially if the car is not moving while the engine is running.. I replaced it twice because I thought the first one was defective. If the radiator fan is not working correctly, your car can get damaged, and if you let it go too long without a repair, the fix can be thousands of dollars out of your pocket. Then of course relay 2 & 3 in the relay box work the radiator fan & the condenser fan. When the switch is unplugged the ground will go away and the relay will close, (normally closed relay), (normally closed switch). Ensure that the wires are firmly attached and are not damaged. In cases like this, you might find that it’s not worth it to buy such an expensive new part for your car. Yes, a broken radiator fan can cause the air conditiong to stop working. All the relays and fuses have been tested, they seem ok. The engine contains a combustion chamber where explosions take place, causing the engine to heat up extremely quickly. If both wires are positive and negative at transmitting 12 volts of electricity, then they are in proper working order. I bought a new relay from an auto parts store, tested it, and the relay worked. Second, start the engine and start idling your vehicle. Unpluging the connector and then the fans run, is the same thing as opening the circuit! Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. 3. In newer cars, you need to first ensure that the radiator fan has actually stopped working before you determine what to do next. Fortunately for you, the average cost of a radiator fan is not very expensive. If the compressor doesn't run the fan doesn't run. Electric Fan(s) not working, Checking the fan(s), relay, fuse and engine temperature sensor's. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. If the fans aren't supposed to come on when the CTS is unplugged, maybe just the sensor that tells the fans to come on when AC is turned on is bad....whatever sensor that is. This switch is configured to work based upon the temperature of the engine. In the meantime I will continue to try to resolve the non working cooling fans using the AC until I do so. That one worked, like this Camry. Unable to locate the temp sensor located on the block, Set the … To prevent the engine from overheating and breaking, coolants are moving throughout the radiator and into the engine to keep the temperature at a workable level. Once the temp gets so hot, the ECU commands the radiator fan to come on. OR there is a circulation problem. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator. That piece was the first thing I replaced. You can clean the sensor by checking out some auto body videos online, or consulting your local mechanic, and then seeing if the radiator fan works again after the cleaning is done. Third, you need to connect the battery negative to the ground side of the fan connector. Overheating The possibilities are (from my research online): 1. 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. If the light doesn’t come on, then you have figured out that the switch is not working. Your Mazda Miata‘s radiator fan has one of the most important jobs on the vehicle.It is the last line of defense between you and an overheating engine. determine if the fan relay is causing your radiator fan to stop working, common reasons why your radiator fan is not turning on, problem might be with the radiator itself, Coolant In Oil – Can Cause Catastrophic Problems, Why a Car Stalls While Driving And What To Do When It Happens, Avoid These 10 Bad Driving Habits That Could Ruin Your Engine. Next thing to check is for power at the fan … Be sure to inspect all of the wiring leading in and out of the radiator fan. If you don’t replace your coolant level when it’s low, then this can cause the engine to become seized. Back Probe the connector terminals with the test light – hopefully, one of the connector terminals is able to turn on the test light. How to Sell Your Car Using Social Media? If the fan comes on when the air conditioning is operating at maximum volume, but doesn’t run properly when the engine is warm or hot, then you might need to check the temperature switch. Is it worth to buy a Toyota Camry 2010 with 152k miles for $5,000. 10 Smart Tips! I must be missing something, or a wire is disconnected. Thank you. I remembered my first or second car had a similar situation. you may need ECM. If you detect zero, then your relay’s power pins have stopped working and you need to replace the relay. Fan has 2 sources of power, 1 which comes on by temperature and the other comes on automatically when … If this is the case, you could be dealing with a stuck-open thermostat – this means that there will be a continuous flow of coolant, causing a lower operating temperature. I checked the relays and they both click showing operation. If the radiator fan is not working, it’s a serious problem.. Just because the radiator fan is not on does not mean that it is not working. Circuit Breaker is Tripped. It clogged the brand new radiator. There are typically a few spots where the problem is originating from, such as the fan motor, thermo switch, wire, or relay. I should have remembered that because a part that is new does not mean that it will work. Set your air conditioning to the MAX setting and turn it on. Insufficient Coolant. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. The main fan is still working today. The condenser fan is working now, but the Radiator fan is still not working (car will eventually start to overheat while idle after 10 minutes or so of driving) The AC compressor will also turn off at idle at this point too. If you prefer to do some of the work yourself, you can actually troubleshoot a cooling fan to see where the problem lies and how to fix it. The ECU’s job is to start the radiator fan once the engine reaches a certain temperature. I bought a Ford Racing fan (GT500, 7 blades instead of 6, louvered holes for additional cooling) - was a great mod and car runs cooler. After getting the engine running I noticed the head gamer problem again. to check this make sure the is hot enough for the fans to be commanded on by computer and check to see if you have voltage at relay and it has ground from computer . Depending on if and when the radiator fan comes on will affect what you should do next, and if the radiator fan has stopped working. Good luck with it! I tried out each relay with a new one, immediately returning them when they did not work. Was tired and put bars leak in it until I could tear it back down. I failed a smog test the first mechanic said it was an O2 sensor and EGR valve. If you don’t want to buy a relay tester, you can purchase a digital multimeter that you can find in any electronics or hardware store. The cooling fan should come on immediately or within the next couple of minutes. However, if your car has coolant in it, but still overheating, then the problem might be with the radiator itself. Ford Transmission Repair Cost – Watch Out For The Transmission Slipping. Don't use bars leak it will stop up the radiator faster then eggs. I guess I will limp the car along for a while and try to solve the issue. For this test, the only tool that you need is a test light. Using the digital multimeter, you should first ensure that the relay you’re texting doesn't have any visibly damaged wires or terminals. The ECU gains information from the sensor, which signals to the ECU to turn on the fan at the correct time. Checked the fuses, nothing. If either does not run, it's the motor. I am patient and will continue to keep working on the situation. The radiator is about two years old and the cooling system is clean. Once you switch your ac on, the fans must work immediately, if they do not then it could be your fuses or fan motors. A radiator fan is imperative in keeping the temperature of the coolant low enough. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. This article pertains to all vehicles. Your engine temperature sensor is responsible for relaying your engine temp to the ECU. I want to know where the shut off switch is located at on my car. You can use a relay tester – this will help you troubleshoot almost all vehicles’ relays. I had to turn the heat on high to keep it cool until I figured out that with the AC on the fans would run. After you have undergone all of the troubleshooting tips to decipher what part is causing your radiator fan to stop working, you need to figure out the correct diagnosis in order to figure out the part that needs replacing, or the part that needs repairing. Refer to the top or side of the relay to locate these terminals. Even if the wires appear to be in great working condition, you should still inspect the relay – the job of the relay is to supply electricity to the wires. the relays control circuit is grounded by ECM (computer) . No fans. 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. I changed out the fan for a new one, when changing it out i had to disconnect a coolant hose and introduced air in the system. I flushed the system again before adding sealant once more. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. If you’re in the car and you feel as if the radiator fan isn’t working, even though it’s on, then the problem might lie within the coolant liquid. No success, I tried switching each of the three of them separately. This has to be a normally closed, two pin switch since it screws into plastic and cannot ground anything. The radiator fan switch relay may not be supplying power to the fan. Your radiator fan has stopped working, and although it’s not an end-all-be-all, it will be a lot more comfortable cruising in your car with a working fan. After you’ve identified the correct terminals, set your multimeter to ‘continuity’. The fan kicked on high at 212 F, just as it should, but didn't run at all below 212. Radiator. The first step you should take is to replace your relay with another one that you are certain is working properly. The tempreture sending unit is close to the thermostat housing top radiator hose,and yes the fan not working and not cooling the radiator and the ac condenser,this will make it not run from being hot. The problem began after I changed my timing belt and water pump for a third time. Check for any damage and clean the connector. No AC (but full with no leaks) 2. The mechanic might charge you an extra $100-$200 for the labor involved. If they run, your problem lies elsewhere. If you have tried the aforementioned fixes and nothing has worked, then a fan clutch or fan belt could be the culprit. If you mean the water temperature sensor on the bottom right of the radiator. The fan belt is responsible for deriving power from the engine to transmit to the radiator fan. © 2020 Cash Cars Buyer. A manual fan is connected to the engine drive pulleys and is controlled by a thermo fan clutch which senses radiator heat and engages when the engine is running at higher temperatures. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. After this, connect the positive battery to the other wire. Had to rod the new radiator to keep it from over heating. Yeah just get the fans to run anyway you can if it dosen't overheat that way and dont worry with the fan system! Plug the connector up to a new switch and heat it up with a small torch and fans SHOULD come on! Thankfully, my stereo has an OBDII diagnostic link, so I was able to immediately get the code, which as mentioned above was a P0480, which means the radiator cooling fan isn’t working right. Overheating..it seems fans are not working radiator light..AC overheating it seems fans are not working radiator light on water level is good. Second, look at the wires and identify which ones are power wires and which ones are ground wires to avoid any confusion. Had a brand new radiator in one and the machine shop didn't surface the heads right. 3 people found this helpful. Fourth, after you connect your fan to the battery, your radiator fan should start running. If the newer relay begins working, then you know the older replay is causing some problems. This small structure can wear out after prolonged use. What a mistake. This switch is what is in charge of sending the signal to the computer to operate the fan. You can bring your vehicle to CashCarsBuyer so we can scrap it – and pay you in the process! If you can’t figure it out, take your car to a mechanic right away so he can determine the issue. Now the cooling fans work for my Camry. Does the engine get HOT without the ac on? If you waited too long to get your radiator fan fixed, then it can cause a whole host of problems with your car. You need to make sure that your coolant liquid is reaching the desired temperature, which is typically around 104 degrees Fahrenheit. If I unplug the sensor the fans run. That is just to help you figure out how I THINK it works. If you are satisfied that the thermostat settings are correct, check your … Also, some of the causes of a broken radiator fan require immediate repair, since they can cause additional problems if left untreated. OR there is a circulation problem. troubleshoot a cooling fan to see where the problem lies and how to fix it. It worked for over two years before these problems began to appear. If this happened to you, you might want to get some quick cash in order to start saving for your next vehicle. 1. I have always worried about the clogging issue and would never recommend using the gunk. circle with 3 dashes on. With the AC on, it ran on high all the time, so the engine temp was actually below 200 with the AC on. If you can’t find a relay that you are sure is working properly, you can still test the relay using a different method. Head gasket (Kwik Fit checked for this, no sign of it, so highly doubtful) 4. I also replaced the thermostat before I realized the fans weren't running. No, only comes on when the coolant is too hot. Head gasket could be the problem all together! 3. By using this site, you agree to these terms: where is the sight shield exactly located? I just had another look at my Camry. I really appreciate your help and will let you know if I figure something out. The first thing I did after the temperature sensor did not work was go to Pep Boys and sequentially go through the relays. If the wire stretches, the wire link could be broken and you’ll need to replace it. Almost seems like it has got to be crud inside the radiator where this normally closed COOLING FAN SWITCH screws into and is not opening the switch circuit when the coolant reaches the correct tempture. Verify that the fans work by unplugging them and run jumper wires to the fan(s) from the battery. With so many miles and not wanting to deal with the head, I figured, What the hell, I would give it a try. If this is the case, you might need to use a voltmeter to test the temperature sensor. I had no more time so I either drove with the heat or the AC on to keep it cool. The car has 229,000 miles. First, you need to connect your test light to the battery ground. Fans, fan motors, fan clutch? All you have to do is follow the instructions that come with the tool. ! You might need to look at your repair manual to see what other parts are located within the circuit. I replaced the radiator and the radiator fan switch. good luck . One solution to this problem is by locating the sensor in the thermostat cove and replacing it with a new one, or cleaning it, and trying the process again. No the AC will turn the radiator fan on to pull air across the condensor. There are a few steps you can take in order to determine if the fan relay is causing your radiator fan to stop working. Unpluging the connector and then the fans run, is the same thing as opening the circuit!! The AC system depends upon being able to dissipate heat into the engine coolant. In order for the AC Condensor to do its job it must stay as cool as it can. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. If the belt/viscous clutch fan is moving enough air (assuming your car has auto transmission), electric fan won't run. Your engine can seize up, which causes the need for an entirely new engine, costing you thousands of dollars. Thank you for taking time out for this. I understand quite a bit of cars and have worked on and built several. Regarding the $300-$400 range, for a quick fix and a long-term solution, that price seems pretty fair to us. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. The fan clutch is in charge of holding the fan to the engine and rotating it. Setting and turn it on if there ’ s temperature, which causes the need for explanation... For over two years old and the machine shop did n't surface the heads right and have on. About 15-20 minutes for the Transmission Slipping, is the same thing as the... Can use a relay tester – this is the same thing as opening circuit... 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