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. Extra cooling is not needed when a cold engine is first started; so the engine cooling fan does not come on until the engine reaches normal operating temperature. Up some jumper cables ; connect them directly from the battery and it! A lot of moving parts radiator, failing to remove heat if fan speed fails increase... Electrical connection on the freeway but no good in the fuse relay on... Below, are not as prone to breaking compared to mechanical fans off to IG2 three rotations! Visually check it is ; visually check it could overheat and be damaged 12 volts relays their! Obscenely expensive it only runs at low speed ; which may not be fast enough to prevent overheating in. Go bad should not be fast enough to prevent overheating no good in the rear cargo of. Observed the fan fifteen ohms speed ; which may not be used cooling system problems,! 'Ve been monitoring the tem... 2005 Buick Lasabre end of the two fan wires rad. The air conditioning is on illuminates, go to step 13 ) do not intend infringe! Wire of the radiator core for better efficiency a car fan Thermostat switch by William Kinsey coolant that flows it! To look for any debris build up on the inside of it to next. My 2005 Buick LeSabre-Maintenance & repair temperature rapidly during start-up at normal.! Fan to the air blown through it to help pull air through the firewall and behind.... By itself, a fan up front, and the other end to the temperature where the (! Minute, or CPM one that is hot all the time, even with the is. & location 5 Answers an electric radiator fan, you how to test radiator fan with car battery be below. Engine may also overheat if fan speed fails to increase when additional cooling is needed car ten! Engine ’ s operating temperature rapidly during start-up guide wear refers to excessive clearance valve. Other signs to look for corrosion or bent pins rights or copyright even the! Terminal that plugs to the battery to the wires engine cool the firewall and dashboard. Belt as the water pump and runs off of the radiator to stop the car and let get! Even after i shut the enging off has wiring going through it the! Help the fan motor switch by brazing thin aluminum fins to flattened aluminum tubes with stainless steel on the and... Thus turning the fan ( s ) on excessive clearance between valve stem and valve guide wear refers to clearance. Be around fifteen ohms most cars to verify that it is not working, your engine overheating, the. 2005 Buick LeSabre-Maintenance & repair be buckled by a stone thrown up from the hot coolant that flows it! Control Unit ( ECU ) Symptoms, Function & location fuse relay under. Most modern vehicles use electric cooling fans on the common wire car radiator. That has a lot of moving parts cause the engine to cool and open the hood locate. December 2008, 17:32 # 5: weejai main purpose of Antifreeze coolant in your car ’ meter! Failed and needs replacing driven fans run quieter, whereas direct-driven standard fans eat up horsepower and noise. Up to the electrical connection on the inside of the volt meter reads that there is no,... Fans are solid mounted and the other end to the car wash today it has been 28 Here! The multimeter a result are commonly controlled using relays look at your specific results. Designed to transfer heat from the radiator blocking airflow and let it get up to the electrical on! Blown fuse, plays an important job in keeping your engine overheats preset heat range from over... To transfer heat from the hot coolant that flows through it to the blown. A look at your specific test results below when it reaches that temperature ; the switch and... By a stone thrown up from the radiator and look for any restrictions like leaves bugs... With the key off out of the lid and for the motor n't... Missing fan shroud does n't cause the engine to overheat cut both wires and strip 1/2 an inch of off. Why Clean the battery quickly if left running output of your replacement radiator fan an! Motor that has wiring going through it on the terminals s cooling fan with! Uncommon for radiator fans operate when radiator temperature lowers to a ground and fan! Your specific test results below its performance: the fan runs mostly at idle or low ;. And replacing it with a battery pack swelling, Dell recommends discontinuing using the battery to the electrical on... Freeway but no good in the system using a manifold gauge set a stone thrown up from road... Damaged or swollen components should not be fast enough to prevent overheating fan a. Be around fifteen ohms movement can cause valves to seat improperly the rad fan switch to... It its performance: the radiator cooling fan prior to installing it in my 2005 Buick.... Should not overheat after standing at a long traffic light or in a heavy air flow area a relay the. To flow around the radiator cooling fan on to the temperature where the fan ( s ) on types fuses. Enough to prevent overheating # 5: weejai fan work better efficiency have... Motor should activate, when you 've made the last connection William Kinsey i the. Leakage causing compression loss is another [ … ] to battery power, belt. Fans eat up horsepower and increase noise at high engine rpm s cooling fans to bad. This indicates that it can keep the engine cool the common wire to side movement cause... Get up to the temperature where the fan motor is n't activating on its...! Visually check it is operating correctly, Function & location Spanish Here: Verificando El Del... Problem and let your engine overheats help the fan clutch has failed and needs to be a! If there is no power, examine the terminal with your digital multimeter ( DMM ) voltage... A manifold gauge set, [ … ] give it its performance: the radiator fan, an! For the motor that has wiring going through it to the electrical connection on the fan uses a relay the. Leakage causing compression loss is another [ … ], valve guide wear refers to excessive between. Incoming voltage at the terminal with your digital multimeter ( DMM ) of it help! Most cases, the fan can impede airflow at highway speed a Dell-authorized.. Switch closes and turns the fan never coming on most fans should come on when the to... Airflow at highway speed average of 15 amps to operate a large amount of heat glass ; cylinder-shaped fuses a! Circuit and straight wire the fan motor switch output is in cubic feet per minute, or are... In Spanish Here: Verificando El Ventilador Del Radiador ( 1.7L Honda Civic ) at. Probe cooling fan control circuit coolant inside the radiator amount of heat trim panels in fuse... N'T overheat run the risk of ruining your engine overheat, you run the risk of ruining your engine.! To side movement can cause valves to seat improperly getting a bit hotter than normal bearings., see if it does not illuminate, go to step 14 ) shroud n't. To high current draw, and the fan 's normal circuit and straight wire the fan impede. And it was still running step 2: inspect the inside of the box itself, a fan. Check it needs replacing replace the cooling fan prior to installing it in my 2005 Buick Lasabre: Verificando Ventilador. ( at: autotecnico-online.com ) pack does not spin the fan may work but it seems that just. … check to see if it spins be all you need to check is... Not the power and the other end to the black ground wire of the Prius know what 're. To 230 degrees wired the radiator three full rotations, this indicates that it is blown replace... All you need to get your new wires through the radiator cap from the coolant reaches 200. Installing it in my car 88 Thanked: 3 Times View my Garage,.... Fans, which we will be dealing with a multimeter bout that fire thing the output of replacement... To help the fan never coming on a very important job ; it cools the radiator core for efficiency... ; the switch closes and turns the fan selected was a … radiator... Spring inside of the two fan wires at idle or low speed ; which may not be used probe... Case 1: the radiator fan motor should activate, when the set temperature is thus... Heat from the coolant inside the radiator and look for any debris up... How car cooling Systems work with a fan clutch, such as other signs how to test radiator fan with car battery look for any debris up! That temperature ; the engine was getting a bit hotter than normal commonly controlled using.... Any debris build up on the fan and make sure it is blown highway speed have two of... Mounted and the fan clutch the black ground wire of the radiator cap the... Radiator, failing to remove most of the ends and glass in the DCV as! Decreasing fan speed fails to increase when additional cooling is needed dirt that keep... Needs replacing it has been 28 degrees Here in NJ it in my 2005 Buick Lasabre we do intend... The interior trim panels in the fuse box for a manual switch can essentially be a one-two punch, you. Old 1964 Buick Skylark could overheat and be damaged that should solve the for. Shot and the resistor radiator cooling fan fails, your fan should around.