First, note that the relay has four terminals: two control terminals and two power terminals. They were fine. 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. If the temperature sensor is broken, it won’t be able to transmit the signals at the proper time to the ECU – and the fan won’t turn on. Everything seems fine. Now the cooling fans work for my Camry. Plug the connector up to a new switch and heat it up with a small torch and fans SHOULD come on! 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. I bought a new relay from an auto parts store, tested it, and the relay worked. 3. If this is the case, you might need to use a voltmeter to test the temperature sensor. After getting the engine running I noticed the head gamer problem again. The fan clutch is in charge of holding the fan to the engine and rotating it. The car has 229,000 miles. Somethings not right - you can hear the compressor start to growl at idle, pull the idle down, then cycle off. There are a few common reasons why your radiator fan is not turning on. If the compressor doesn't run the fan doesn't run. 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. In order for the AC Condensor to do its job it must stay as cool as it can. Ensure that the wires are firmly attached and are not damaged. It worked for over two years before these problems began to appear. You might need to look at your repair manual to see what other parts are located within the circuit. If the fan doesn’t come on at all or runs at a very low speed, then you need to replace the fan motor as well. Radiator. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. Most fans will only kick on at about 220-230 to prevent overheating. No fans. If you can’t find a relay that you are sure is working properly, you can still test the relay using a different method. You may need to look at your vehicle repair manual to see if your vehicle has a 4-wire terminal or three terminals, with two for power and one for ground wires. But should not overheat. Fourth, after you connect your fan to the battery, your radiator fan should start running. 10 Smart Tips! If you don’t replace your coolant level when it’s low, then this can cause the engine to become seized. A radiator fan is imperative in keeping the temperature of the coolant low enough. Replacing the relay could fix your radiator fan from having stopped working. Had to rod the new radiator to keep it from over heating. All you have to do is follow the instructions that come with the tool. Overheating..it seems fans are not working radiator light..AC overheating it seems fans are not working radiator light on water level is good. ! This one I did not test earlier thinking it was not involved. When the switch is unplugged the ground will go away and the relay will close, (normally closed relay), (normally closed switch). That is until it maybe craps out. OR there is a circulation problem. The engine contains a combustion chamber where explosions take place, causing the engine to heat up extremely quickly. The radiator probably needs flushed, replaced, or relocate the switch somewhere in the cooing system where it can heat up allowing the switch to open and the fan come on. Electric Fan(s) not working, Checking the fan(s), relay, fuse and engine temperature sensor's. Unpluging the connector and then the fans run, is the same thing as opening 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. In newer cars, you need to first ensure that the radiator fan has actually stopped working before you determine what to do next. If your coolant level is low, then it might not feel as if your car is getting cool, even with the radiator fan turned on and working. 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. If the wire stretches, the wire link could be broken and you’ll need to replace it. The cooling fan operation is determined by the condition of the a/c compressor, not the other way around. Ford Transmission Repair Cost – Watch Out For The Transmission Slipping. 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. 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. Once you replace the relay, the radiator fan should start working again. 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. Wire them up direct to the ignition switch or whatever. Now you just need to wait for the engine to reach the correct temperature. I looked it up and tried to explain it to him in my reply. For this test, the only tool that you need is a test light. Auto Repairs Are EXPENSIVE Engine Replacement: $1300+ Transmission: $1000+ Air Conditioner: $750+. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. If you have tried the aforementioned fixes and nothing has worked, then a fan clutch or fan belt could be the culprit. Try to grab the end and stretch it. Overheating The possibilities are (from my research online): 1. Turning on the AC automatically turns on the radiator fans, hot or not hot. Once the temp gets so hot, the ECU commands the radiator fan to come on. Third, you need to connect the battery negative to the ground side of the fan connector. Regarding the $300-$400 range, for a quick fix and a long-term solution, that price seems pretty fair to us. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. 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 have no online auto repair service (Mitchell On Demand etc) to refer to, i know the other guys do so maybe they can help. If you waited too long to get your radiator fan fixed, then it can cause a whole host of problems with your car. If your Aveo has a bad engine temp sensor the radiator fan won’t know to come … 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. If either does not run, it's the motor. This has to be a normally closed, two pin switch since it screws into plastic and cannot ground anything. I replaced it twice because I thought the first one was defective. Had a brand new radiator in one and the machine shop didn't surface the heads right. 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. Verify that the fans work by unplugging them and run jumper wires to the fan(s) from the battery. 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. 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. Checked the relays, only found 3 of them, still not working. I think the water pump, one year old, and the head gasket failed again because I did not notice the engine temperature creeping up while idling. Fan has 2 sources of power, 1 which comes on by temperature and the other comes on automatically when … Check for any damage and clean the connector. There are a few steps you can take in order to determine if the fan relay is causing your radiator fan to stop working. 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. If they run, your problem lies elsewhere. This being said it works on the principal as # 1 said, The coolant has to warm to a point that the switch can open to be able to allow the fan to come on. 1. If the fan doesn’t come on, you need to look for a blown fuse or breaker. I must be missing something, or a wire is disconnected. 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. If the test shows that there is indeed incoming power, then you have narrowed down the problem to the fan motor. This small structure can wear out after prolonged use. This switch is what is in charge of sending the signal to the computer to operate the fan. A blown fuse can happen when there are electrical surges going towards a piece of electronic equipment, forcing the fuse to cut the electrical supply in order to save the equipment from an overload. Was tired and put bars leak in it until I could tear it back down. 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. A friend said on his 2010 escape he had to change out the radiator fan and it fixed his ac. I lived with it for a year and now it's not coming in at all. Thank you for putting into words how the relays work. 3 people found this helpful. I replaced the radiator and the radiator fan switch. the relays control circuit is grounded by ECM (computer) . If you mean the water temperature sensor on the bottom right of the radiator. Later, I tested the cooling relays one and two. 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. In the meantime I will continue to try to resolve the non working cooling fans using the AC until I do so. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. By using this site, you agree to these terms: where is the sight shield exactly located? With the AC on, it ran on high all the time, so the engine temp was actually below 200 with the AC on. 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. The cooling fan should come on immediately or within the next couple of minutes. Is it worth to buy a Toyota Camry 2010 with 152k miles for $5,000. 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. Second, look at the wires and identify which ones are power wires and which ones are ground wires to avoid any confusion. The cooling fans on Chrysler cars are not particularly well-made, but that doesn't mean you can assume that they are broken the second the cooling system stops working. As soon as you feel like your radiator fan has stopped working, or your car isn’t getting cool, you need to take some troubleshooting steps in order to determine what the problem is. There are typically a few spots where the problem is originating from, such as the fan motor, thermo switch, wire, or relay. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. I just had another look at my Camry. If the light doesn’t come on, then you have figured out that the switch is not working. Connect one lead to the power circuit and one lead to the power terminal. OR there is a circulation problem. No, only comes on when the coolant is too hot. Here are the next steps to take once you connect direct battery power to the radiator fan. © 2020 Cash Cars Buyer. A coolant fan switch is a small and very simple switch comprised of typically two wires. 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. Fans, fan motors, fan clutch? price can range from $300-$1,200 for a fix. 3. Reason i ask is sometimes the car can run for 30 min or more before the fans come on from engine heat. 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.. Circuit Breaker is Tripped. I want to thank everyone for their inputs, they all were valid. Yeah just get the fans to run anyway you can if it dosen't overheat that way and dont worry with the fan system! 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. 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. The problem began after I changed my timing belt and water pump for a third time. If you are satisfied that the thermostat settings are correct, check your … That one worked, like this Camry. I kick myself because I know better than to just assume new parts will work properly. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. However, in some cases, if you wait too long, the price can range from $300-$1,200 for a fix. Also, some of the causes of a broken radiator fan require immediate repair, since they can cause additional problems if left untreated. I should have remembered that because a part that is new does not mean that it will work. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. 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 . 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. 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. Also check the water temp switch on the right hand side of the radiator. The radiator fan switch relay may not be supplying power to the fan. After you’ve identified the correct terminals, set your multimeter to ‘continuity’. All fuses are good, and I swapped the sub fan and AC relays, since they're the same, but this had no effect. If the problem is with the coolant, performing a coolant flush will allow the corrosion that has built up over time to break down. I see in the service manual that this does happen, but it does not tell me how to diagnose. If there’s a problem with the engine’s temperature, then this can damage the radiator. I was on vacation in January. Second, start the engine and start idling your vehicle. Despite a blown fuse not being a big issue, it is important to find and fix. I understand quite a bit of cars and have worked on and built several. 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. First, you need to connect your test light to the battery ground. A seized engine can be caused by insufficient coolant, cursing the gasket to blow up, and the engine to leak oil. 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. Head gasket (Kwik Fit checked for this, no sign of it, so highly doubtful) 4. Does the engine get HOT without the ac on? The mechanic might charge you an extra $100-$200 for the labor involved. All the relays and fuses have been tested, they seem ok. you may need ECM. The fan belt is responsible for deriving power from the engine to transmit to the radiator fan. 2. I really appreciate your help and will let you know if I figure something out. If your fan has still failed to turn on, you can check the fan by connecting a different power source to it. 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Order for the Transmission Slipping to come on, then you have figured out the! Desired temperature, which causes the need for an entirely new engine costing. Fan ( s ) from the battery ground ): 1 ) 2 shop did n't the! Mean that it will work the need for an explanation of the wiring diagram will, the! To replace it not come on immediately or within the circuit! $ 300- $ 1,200 for a.!