Of course, not all radiator fans are electrically operated, and a large percentage of vehicles use radiator fans that are driven through viscous couplings. If it stops working, your engine could overheat and be damaged. The tip of the (ECT) sensor protrudes into one of the cooling system passages; and […], Antifreeze Coolant is a mixture of antifreeze agents and water; which goes into your vehicle’s cooling system to regulate the temperature. Hydrolocked Engine – What Is It – What Damage Can It Do, Engine Coolant Temperature (ECT) Sensor – Function – Failure And Testing, Engine oil mixed with coolant in the cooling system, Is very common after a blown or leaking head gasket. Be sure you have the right one. To check this, unplug the single wire connector and, using a jumper wire, ground it. Radiator fans not running 5 Answers. Why Clean the Battery Fan? Using scan tool, command cooling fan on. I took it to the car wash today it has been 28 degrees here in NJ. Consequently, if it does not spin it is blown. If the fan on your radiator is not working properly, it can't circulate air through the radiator to cool the fluid and subsequently cool off the motor. The fan clutch has a spring inside of it to help the fan spin faster. Park the car. Got it... Finding a garage is another 'penidng item' for me in Andheri (e) ever since I … If your radiator fan has a fan clutch, check the radiator fan while the motor is running. So, […], Valve guide wear refers to excessive clearance between valve stem and valve guide. (30th December 2008, 17:32 #5: weejai. Yes, you can power the fan from the battery momentarily to see if the fan works, however powering it continuously from the battery is a bad idea. In general; most vehicles on the road have two types of fuses. Step 3. But it's a contributing element. If so do you know if they come in different temperature turn-on specifications? You have to check the voltage of a few fuses in the under-dash fuse box (number 3, 15, and 20) and under-hood fuse box (number 47 and 50). Connect one end of the volt meter to a ground and the other end to the electrical connection on the fan. Posts: 88 Thanked: 3 Times View My Garage. As you're probably already aware, the radiator fan motor is one of the principal components that helps … Without it, air tends to flow around the radiator, failing to remove most of the heat from the coolant inside the radiator. 2000 Buick LeSabre Limited Sedan FWD-Maintenance & Repair. Some cars can look a bit ugly with a fan up front, and the fan can impede airflow at highway speed. All well and good in theory. Step 4: Test the fan motor. Connect one end of the 12-gauge jumper wire to the black ground wire of the fan. The recommended high-side and low-side … Adding a manual switch can essentially be a one-two punch, once you know what you're looking for. It is designed to transfer heat from the hot coolant that flows through it to the air blown through it by the fan. If you have had problems with your engine overheating, check your radiator fan and water pump. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. Look at the fan and make sure there is no obstruction in front of the radiator blocking airflow. If you are the rightful owner of any of the pictures/wallpapers posted here, and you do not want it to be displayed or if you require a suitable credit, then please contact us and we will immediately do whatever is needed either for the image to be removed or provide credit where it is due. The thermostat switch can be tested easily … Step 2: Inspect the inside of the radiator. A radiator fan requires an average of 15 amps to operate. To check for this condition the engine must be off, inspect the fan clutch for leakage at the front or rear of the unit (input shaft and temperature controlled expansion spring). > > The quickest way to begin trouble shooting this system is to use the > Coolant Fan Test Connector located in the triangular shaped > relay/fuse box just behind the car battery. This will be your install option to get your new wires through the firewall and behind dashboard. The fan selected was a … Source: AudiWorld. This is the terminal that actuates the relay. If the fuse is blown simply replace it and that should solve the issue for you. When the cooling fan fails, your engine overheats. Then test for incoming voltage at the terminal with your digital multimeter (DMM). If the fan doesn't work with direct battery power, examine the terminal that plugs to the radiator fan connector. Consequently, Some vehicles have as many as three; Consequently, with the engine running and the coolant temperature switch unplugged the fan should come on. The first step is checking for a blown fuse. When vehicle cooling system problems arise, each component should be tested to verify that it is operating correctly. Then test the fan clutch by giving it a good push. I drove the car about ten miles today, and noticed that the engine was getting a bit hotter than normal. Once you connect the fan to battery power, your fan should start running. If the volt meter reads 12 volts, the problem is not the power and the fan needs to be replaced. The three factors that determine the efficiency of a cooling system are the water-flow rate around the system, the … If the volt meter … The fan will discharge the battery quickly if left running. There are several advantages to this type of radiator fan, not the least of which is that it eliminates all the potential problems that go with a complicated electrical system. Make sure the belt is in good condition and has tension. Determine whether your radiator fan is manual or electric. 10. That may be all you need to get back on the road. Picture of radiator showing side tank with cooler. If your car’s radiator fan is non-functional first check your car’s user manual and locates the fuse for the radiator fan. So, You opened your coolant reservoir or the radiator cap and see that the coolant and […], The (ECT) sensor, is an engine management system sensor; that is used to monitor the temperature of the engine’s coolant. Then test for incoming voltage at the terminal with your digital multimeter (DMM). As valve guides wear, the side to side movement can cause valves to seat improperly. It is normal for the fan to cut in only after the car has reached a certain preset temperature, but the fan should cut in within few seconds once you start the Aircon. – Why Do You Need It ? When you say "Thermostat for the switch", do you mean a Temperature Sensor Switch of some type or Cooling Fan Switch that mounts on the engine or radiator. This is the terminal that actuates the relay. Is there a better way to do … The best way to test it is to bypass the fan's normal circuit and straight wire the fan to the engine. Once the air coming into the radiator has greater mass than the fan can move, the fan can become a blockage for that airflow. The radiator fan should be running at more RPMs than the motor. I'd like to do as described here, but with the relay, and I would like to have my cooling fan turn on at 160, or 180 degrees in the summer and a higher temperature in the … I was wondering if it was possible to grab a car radiator fan (which has a 12V DC motor), face it into the wind, and turn the motor into a generator. Open the hood and locate the fuse relay box on the driver's fenderwell. Start the car and let the engine warm up. A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. First off you're gonna need a car. Most of these cooling fan resistors will be mounted onto the radiator cooling fan assembly so that they can be in an area that gets a large amount of air flow. Timing Belts – Why Should You Replace Your Engine Timing Belt, Engine Spark Knock – That Annoying Knocking, Pinging Or Rattling Sound, Tailpipe Smoke – What Does The Color Of The Tailpipe Smoke Mean, Engine Coolant Leaks – How To Find Them – How Bad Are They, Valve Lifters – Hydraulic And Mechanical – What Is The Difference, Radiator Cap – Basic Function – Failure Symptoms – How Important Is It, Engine Bearing Replacement – Learn How To Replace Engine Bearings, PCV Valve System (PCV) (Positive Crankcase Ventilation System), Radiator – Overheating, Causes, Consequences And Maintenance, Spark Plug Problems – Troubleshooting, Failure Symptoms, Replacement, Vacuum Leak Repair Locations – Common Causes – Common Repairs, Valve Guide Wear – Can Cause Other Major Damage, Besides Burning Oil, Defective temperature switch; coolant sensor or other sensor, Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan), A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc. Your engine cooling fan will not work if you have a blown fuse. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. Let's take a look at your specific test results below. The fan uses a relay in the fuse relay box under the hood. Or the silicon grease can start to leak causing the fan clutch not to lock up allowing the fan to "freewheel", failing to pull air through the radiator when needed. How does a car’s cooling fan work? Older cars have glass; cylinder-shaped fuses with stainless steel on the ends and glass in the middle. Use the volt meter to test if there is power to the wires. So, cooling fan motors are an important component to any engine cooling fan assembly; and play a key role in keeping the car at safe temperatures during idle and low speeds. BUT it seems that this just burns up the rad fan switch leading to the fan never coming on. Touch the black multimeter probe to the negative battery terminal (if you're testing under-hood fuses) or any metal ground point on the car (if you're testing under-dash fuses). You’ll hear people talk about how their car is fine on the freeway but no good in the suburbs. ). I went outside a while after and it was still running. Step 1. Check #6 – Faulty radiator cooling fan. I really would rather have it manuel because the guy I got the car from has some horrible wiring and the rad fan fuses might be blown. Replace it and you are back on the road. The first components that should be tested are the cooling fan, the cooling fan relay and the thermostat switch, which turns the fan on and off depending on the temperature of the engine. Connect the other end of that wire to the engine block or any metal … If test light does not illuminate, go to step 21). But most if not all modern radiator motors lack permanent magnets so that when you spin the fan, nothing is generated except a light sweat. Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. So, If you find a blown fuse replace it. Kick off the engine or switch the ignition key off to IG2. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. The output of your replacement radiator fan will vary depending on how many cylinders are in your car’s engine. If you ignore the problem and let your engine overheat, you run the risk of ruining your engine completely. As not to run my battery down, I open the fuse and … The main purpose of Antifreeze Coolant in your engine is to remove heat. Most of the images displayed are of unknown origin. It should be roughly 12 volts. Connect test light battery voltage and probe cooling fan control circuit. The first components that should be tested are the cooling fan, the cooling fan relay and the thermostat switch, which turns the fan on and off depending on the temperature of the engine. Since the fan motor isn't activating on its own... the next step is to check the radiator fan motor switch. Some manual radiator fans have a fan clutch. How to Test a Car Fan Thermostat Switch by William Kinsey . Some radiator fans are solid mounted, with no fan clutch. Make sure that the four bolts holding the radiator fan are tight. > For instance, there are three radiator fans, three water pumps, four > thermostatic switches and seven relays for the engine cooling > system. To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on. The fan may work but it only runs at low speed; which may not be fast enough to prevent overheating. Testing and Repairing the Radiator Fan. Radiator fans not working 9 Answers. Remove the lid. Look on the inside of the lid and for the mapping of the fuses and relays with their location. BHPian . Pull the cooling fan relay out of the box. Valve leakage causing compression loss is another […]. Decide on best location to install switch and drill hole to accommodate the installation. For a manual radiator fan, conduct a visual inspection first. This test result tells you that the radiator fan motor is good. Erin has a Bachelor of Arts degree in English with an editing minor from Brigham Young University in Provo, Utah. A radiator fan requires an average of 15 amps to operate. The relay has four terminals--one that is hot all the time, even with the key off. Connect test light to battery voltage and probe cooling fan control circuit. Location: Bangalore/Mumbai. CASE 1: The radiator fan motor came on. Since power to the cooling fan is sometimes routed through the cooling fan resistor, when it fails or has any problems , it can cause issues with the regular operation of the fans, which can lead to overheating. Here’s how to test the radiator fan fuses with a multimeter. The volt meter will then give you a voltage reading. If the fans were not spinning normally, the issue is either the electric motor that turns the fan, or the relay that triggers the fan to come on. When it reaches that temperature; the switch closes and turns the fan(s) on. 2. Pull the connector apart and look for corrosion or bent pins. You will now place the red probe on the common wire. CASE 1: The radiator fan motor came on. If The Fuse Is OK Move On To The Next Step. 11. Yours could be blown so you will need to check it. Using a multimeter is another good way. Check the fuses one by one. When the radiator temperature lowers to a preset level, the electric fan turns off. When the correct parameters are met, a temperature switch or the computer will activate … Here’s how to test the radiator fan fuses with a multimeter. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. With most older cars, you will need to remove the radiator to check that the fan bolts are secure as usually there is not enough room to slip in a spanner or a small socket with the radiator in place. Radiator fans not running 5 Answers. Materials Needed. Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. While a swollen pack does not represent a safety concern, damaged or swollen components should not be used. It is designed to be in a heavy air flow area. Engine Antifreeze Coolant – What Does It Do ? To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on. Test the third set of wires: With the negative black multimeter test lead still on the brown wire, take the red test lead and take it off of the white wire. Connect one end of the volt meter to a ground and the other end to the electrical connection on the fan. If test light illuminates, go to step 13). Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. I guess the idea is that a blown fuse or faulty wiring would never lead to the fan not working and thus the car overheating. I wired my radiator fan directly to my battery on a suggestion from a reputable VW aircooled and diesel mechanic my dad takes his cars to. If the fan clutch requires repair, take the vehicle to a qualified mechanic. In general there are six things that may prevent an electric cooling fan from coming on; On most systems; there is a coolant temperature switch that turns the fans on and off. The … A problem with any of these three components can cause a problem with the fan, so it is best to test their integrity before making any repairs or replacements. So today we are working on my old 1964 Buick Skylark. Below we will cover the process necessary to complete the change of the cooling/radiator fan motor, for most cars. Check the fuses one by one. Let's take a look at your specific test results below. Cars or trucks with 8 cylinders require much fans with much higher CPMs than 6 or … The Radiator Fan Relay. If It Is Working; Move On To The Next Step. Fan shroud missing: Many car owners frequently miss this one. The Next Thing To Test Is The Coolant Switch Or Sensor, Oil Mixed With Coolant In The Cooling System – Cleaning Tips, (ECT) Engine Coolant Temperature Sensor – What Can Go Wrong, Antifreeze Coolant – What Are The Basics You Really Need To Know. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Kick off the engine or switch the ignition key off to IG2. The cooling fan resistor is an electrical resistor that limits power to the fan in steps, so that the fan can operate at different speeds according to the cooling system’s demands. Electric radiator fans operate when radiator temperature rises to preset heat range. Connect one end of the volt meter to a ground and the other end to the electrical connection on the fan. Consequently, if it does not spin it is blown. This is the best test of any system. You have to check the voltage of a few fuses in the under-dash fuse box (number 3, 15, and 20) and under-hood fuse box (number 47 and 50). Radiator fan output is in cubic feet per minute, or CPM. Locate the coolant temperature switch and unplug it. Good-luck. At this point the fan should come on. I wired my radiator fan directly to my battery on a suggestion from a reputable VW aircooled and diesel mechanic my dad takes his cars to. Part 1 of 5: Remove the cooling/radiator fan assembly. If the car begins to overheat and the fans never kicked on, the issue is either the cooling fan motor itself, or the relay that controls it. Normal voltage for a radiator fan is around 12 volts. The relay has four terminals--one that is hot all the time, even with the key off. Unplug the Fan Connector closest to the fan. If you have problems with the radiator fan, you need to take care of them immediately or you could cause serious damage to your car. Most newer cars have a different style of fuse that uses a plastic housing; with the fusible link encased in the housing. The … So, The fan runs mostly at idle or low speed when the engine is at normal temperature. To check a radiator fan, you will be dealing with a part of the motor that has a lot of moving parts. Step 1. Why are radiator fans not … It is uncommon for radiator fans to go bad. Remember that a blown fuse can mean that your fan is turning roughly and it might need to get replaced if the fuse gets blown again. In addition, a fan clutch reduces wear by decreasing fan speed and raising the engine’s operating temperature rapidly during start-up. Look for a rubber grommet in back wall (firewall) of engine compartment that has wiring going through it. In conclusion. Check the electrical connection at the fan. Fan shroud missing: Many car owners frequently miss this one. A fan blade spinning at 3,000rpm could inflict a lot of damage if it flew off so make sure it is firmly located. It worked fine. Since power to the cooling fan is sometimes routed through the cooling fan resistor, when it fails or has any problems , it can cause issues with the regular operation of the fans, which can lead to overheating. Use the volt meter to test if there is power to the wires. By itself, a missing fan shroud doesn't cause the engine to overheat. 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