move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan. How to test Radiator Fan, Control Modle, or relay with VCDS Lite audi a4 / b6. Chrysler  |   Coolant (or water) boiling in the radiator's overflow tank as the engine runs or when you turn off the engine. Easy step by step procedure to test an automotive relay, this information pertains to all relay controlled circuits. How To Test: The Ignition Switch (Honda Accord 1998-2002), How To Test: Transmission Range Switch (Honda 2.2L, 2.3L), How To Test: A/T Clutch Pressure Control Solenoid A and B (Honda 2.2L, 2.3L), “Remember, this hobby is supposed to be your therapy, not the reason you need therapy.”Anonymous, Home  |   CASE 3: One fan motor ran but NOT both. Coolant boiling in the radiator's overflow tank and the radiator fan motor does not activate. We'll remove the radiator fan relay from the under-hood fuse box and check that circuits 1 and 3 have power. This material may not be reproduced without the author's consent. Since we're gonna' be testing these radiator fan relay circuits (in the under-hood fuse box), here's a brief description of each: There are four separate tests in this tutorial and each one is designed to take the complete novice through the entire troubleshooting experience in a step-by-step way. The cooler/ radiator fan driver relay is located in the black box just behind your drivers side headlight assy under the hood. VW  |   Jumpering any other female terminals can damage the fuel injection computer. Misc Index  |   Nissan  |   Page 2 of 3 First 1 2 3 Last. Your next step is to go to: TEST 4: Bypassing The Low Speed Fan Motor Relay. You'll also see one (or more) of the following symptoms: The radiator fan relay is located in the under-hood fuse box (see the illustrations in the image viewer). Take a paper clip and unbend it (or preferably make a short test jumper with male spade terminals on each end: like this), and insert one end into the White terminal of the Radiator Fan Relay socket, insert the other end into the White/Blue terminal of the same socket. Your Honda will not re-start (once it has overheated). If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. Printable View. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. You can follow the printed diagram on the cover to locate the relay you are in need of replacing. CASE 3: Female terminal 74 DOES NOT have 10 to 12 Volts. Install a 10-gauge wire to the battery positive terminal with the use of a round electrical connector. Disclaimer. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. To be a little more specific: We're gonna' jumper terminal number 72 and terminal number 74 of the relay socket in the Power Distribution Center (under-hood fuse box). The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. Terms of Use Mitsubishi The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. It is your power distribution control. Turn the key ON but don't start the engine. The results of your tests will help you troubleshoot the reason your Honda Accord's radiator fan motor isn't 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. On most Chrysler vehicles, the cooling fan relay must be engaged before power can go to … Jump to page: 08-04-2015, 01:09 PM. They are designed to only run when needed. Diagnosing a 3.6L "Pentastar" Jeep JK Radiator Fan Issue (Code: … Do NOT follow this link or you will be banned from the site! The radiator fan relay socket (in the under-hood fuse box) has four female terminals. Your multimeter should read 10 to 12 Volts DC. Show 40 post(s) from this thread on one page. The fan motor that did not run is bad. Gently probe female terminal number 71 with the red multimeter test lead. Circuit that feeds the radiator fan switch's ‘On’ or ‘Off’ signal to the radiator fan relay. This is the correct and expected test result. GM  |   This last test is optional and shows you how to bench test the fan motor relay. If it spins more than three full rotations, this indicates that it may be prone to slipping. Ford  |   After replacing the fuse check that terminal 74 has 10 to 12 Volts. They are designed to only run when needed. Bypassed the low speed radiator fan motor relay (TEST 3). Do NOT follow this link or you will be banned from the site! Set th… Power provided by fuse #4 (7.5 Amp) of the left side dash fuse box (see image 4 of 4). How To Test The Radiator Fan Relay (Honda 2.2L, 2.3L), START HERE: The Radiator Fan Motor Relay Tests, TEST 1: Checking The Radiator Fan Relay Power Circuits, TEST 3: Bypassing The Radiator Fan Switch, TEST 4: Bench Testing The Radiator Fan Relay. Refer to the top or side of the relay to locate these terminals. Isuzu  |   How do I test to see if the radiator fan relay is getting power or a signal. TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts, TEST 4: Bypassing The Low Speed Fan Motor Relay, TEST 1: Testing The Amperage Draw Of The Low Speed Radiator Fan Motor, TEST 5: Bypassing The High Speed Fan Motor Relay, TEST 6: Making Sure The Radiator Fan Assembly Is Getting Power From The Low Speed Relay. Power provided by fuse #57 (20 Amp) of the under-hood fuse box (see image 3 of 4). Your Jeep Liberty‘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. You can also conclude that female terminals 76 and 79 of the high speed radiator fan relay are also receiving these 10 to 12 Volts DC. If you have tested the amperage draw of the low and high speed circuits of the fan motors, then your next step is: TEST 4: Bypassing The Low Speed Fan Motor Relay. Reinstall the Radiator Fan Main Relay. Suzuki  |   Once activated the relay connects an electrical supply to a particular accessory. Honda  |   Your next step is to check the fuse and if it's blown, replace it with a new one (of the same rating). GM  |   Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! We use cookies to … You should be able to conduct an Output Test with the ECM (key-on, engine-off). Most modern vehicles use electric cooling fans to help pull air through the verrilli. This is very rare but a lack of 10 to 12 Volts at female terminal 71 generally lets you know that fuse 23 of the Power Distribution Center is blown. CASE 1: Both female terminals (71 and 74) have 10 to 12 Volts. Honda  |   Chrysler  |   Here we're gonna' bypass the radiator fan switch with a jumper wire and see if the radiator fan motor comes on. In this tutorial, I'm gonna' show you how to test the fan relay and more importantly... ...How to test the radiator fan relay's circuits in the under-hood fuse box. The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. These fuses are: Before we continue with our radiator fan motor diagnostic we need to make sure that these 2 fuses are providing 10 to 12 Volts to the fan motor relays. The logic module uses the temperature switch on the radiator for 1984 models; the radiator is turned on when the coolant temperature reaches 210 degrees and turned off when the coolant temperature cools to 180 degrees. 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. CASE 2: Female terminal 71 DOES NOT have 10 to 12 Volts. IMPORTANT: Do not jumper any other terminals of the relay socket than the ones indicated! After confirming that the radiator fan relay is getting juice (TEST 1), the next step is to jumper circuits 1 and 2 with a jumper wire to see if the radiator fan motor comes on. The radiator fan switch relay may not be supplying power to the fan. But to be sure they're bad, you need to make sure that the fan motors are getting power and Ground. Depending on your level of wrenching/diagnosing experience, you can apply the tests to fit your particular situation, or start from TEST 1. You can conclude that fuse 12 and fuse 23, of the Power Distribution Center, are OK (not blown). Checking the operation of a fan relay on your vehicle is an easy procedure. Jeep  |   Battery power for the radiator fan motor. If 10 to 12 Volts DC are present at female terminals 71 and 74, then we can conclude that the fuses are OK and we can also conclude that female terminals 76 and 79 (of the high speed radiator fan relay) are also receiving this voltage. After replacing the fuse check that terminal 71 has 10 to 12 Volts. This lets you know that the high speed radiator fan motor has failed due to excessive wear and tear. Part 1 -How to Test the Radiator Fan Relay (Honda 2.2L, 2.3L) Reply. Remove the low speed radiator fan motor relay from the Power Distribution Center. The next step is to apply battery power to the low speed circuit of the radiator fan motors. Although this info applies to any 1998-2001 4 cylinder Honda Accord, the basic testing procedure (in each test step) can by applied to any Honda. Radiator fan relay by Bob O'Neill and Bob Lincoln Because the radiator fan requires a high level of current, a relay, managed by the logic module, turns the fan on and off. In this test step we're gonna' apply battery power to the low speed circuit of the radiator fan motors by bypassing the low speed radiator fan relay with a jumper wire. This is usually caused by a bad radiator fan motor or fan motors drawing more than 40 Amps as they run. Your Radiator Fan Stopped Working - Here Are The Next Steps To … The low speed and high speed relays get power from the same 2 fuses (see image 2 of 3). Replace the radiator fan assembly. Reply. In that case you most likely have a bad ground or a bad radiator fan switch. The filter is mounted in a hot area and tends to fail, preventing the cooling fan from operating. This test result generally lets you know that the fan motors are bad and that the radiator fan assembly needs to be replaced. Each terminal provides a specific signal. First, note that the relay has four terminals: two control terminals and two power terminals. Part 2 -How to Test the Radiator Fan Relay (Honda 2.2L, 2.3L) Locate the relay in immediate proximity to the fan being used. Repeat steps 3 through 5 on female terminal 74. Since in this tutorial we're only troubleshooting the fan relay and its circuits, you'll find the radiator fan motor test here: How To Test The Radiator Fan Motor (Honda 2.2L, 2.3L). Also, verify connectivity from the relay socket to the other connection on the fan … If the radiator fan motor relay fails, the most obvious symptom that your Honda Accord will experience is overheating due to radiator fan not coming on. can anyone tell me where the radiator fan relay is? You can conclude that the low speed circuit of both fan motors is OK if you have confirmed that their amperage draw is less than 40 Amps in TEST 1. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. How To Test The Radiator Fan Motors (2001-2006 2.4L DOHC Chrysler Sebring And Dodge Stratus), Radiator Fan Circuit Wiring Diagram (2001-2006 2.4L DOHC Chrysler Sebring And Dodge Stratus), Starter Motor Circuit Wiring Diagram (2001-2002 2.4L Sebring And Stratus), "Hard work never killed anybody, but why take a chance? If the fan clutch requires repair, take the vehicle to a qualified mechanic. The correct and expected test result is for the fan motors to run in low speed when both terminals are jumpered together. Disclaimer. CASE 1: Both fan motors ran. Tools  |   Fuse 12 (40 A) of the Power Distribution Center. This material may not be reproduced without the author’s consent. Illustration 1 of 2 shows the location of the low speed radiator fan motor and illustration 2 of 2 will help you identify the female terminals we need to jumper together. Fuse 23 (20 A) of the Power Distribution Center. If the car is already hot, should it be - Answered by a verified Jeep Mechanic. This is the correct and expected test result. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. 0.4 = 31.25 and this would translate to 31.25 Amps. Locate female terminals #72 and #74 of the relay socket (see illustration 2 of 2). Swop with suspect and will switch on whatever you want to test . This socket is on the Power Distribution Center (see image 3 of 3 above). Purchase a 4-post relay with a 30-amp rating. A relay is switch that utilizes an electrical trigger signal to activate. Difficulty Scale: 4 of 10. Connect one end of the jumper wire to the terminal labeled with the number 72 (see illustration 2 of 2). ", Home  |   I have a spare relay for test purposes . Find a spot to secure the relay with a screw or a bolt. MVB-137 will show you some AC system status/request info. Disconnect the fan connector and make sure you have a good ground (the other connection goes to the relay). CASE 2: The amperage draw is over 40 Amps. Locate female terminals 71 and 74 of the relay socket (see illustration 3 of 3). Save Share. 2003 A4, AMB. To be a bit more specific: We're gonna' jumper female terminals 77 and 79 of the high speed radiator fan relay socket in the Power Distribution Center. If You Think The Problem Is The Cooling Fan Relay, Test It ! Hot (+) only with Key On Engine Off (KOEO) or Key On Engine Running (KOER). The under-hood fuse box is located towards the rear of the engine compartment. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. NOTE: Be careful when probing the female terminals of the relay socket with your multimeter test lead. The most … This test result generally lets you know that fuse 12 of the Power Distribution Center is blown. Battery power for the radiator fan relay's coil. Your next step is to go to: TEST 6: Making Sure The Radiator Fan Assembly Is Getting Power From The Low Speed Relay. Then test the fan clutch by giving it a good push. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. The cooling fan relay is the relay that controls the engine’s cooling fans. Circuit that channels the battery power to the radiator fan motor when the relay closes. For this test go to: TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts. Connect the other end of the jumper to the terminal labeled with the number 74 (see illustration 2 of 2). If the fan does not operate check the Measuring Value Block(MVB) Group 135, field 2 will show you in (%) the current fan output speed from the ECM. Jeep  |   If you haven't already tested the amperage draw of the fan motors, then that is your next step go to: TEST 1: Testing The Amperage Draw Of The Low Speed Radiator Fan Motor. The next step is to apply battery power to the high speed circuit of the radiator fan motors. Ford  |   These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. In this test step we're gonna' apply battery power to the low speed circuit of the radiator fan motors by bypassing the low speed radiator fan relay with a jumper wire. Ground the black multimeter test lead on the battery negative (-) access point (on the left-side strut tower). You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. The both fan motors should run in low speed. Your Toyota Camry‘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. Your temperature gauge will max out (as you're driving around). Disconnect the negative battery terminal. To replace the cooling fan relay… Your next step is to go to: TEST 5: Bypassing The High Speed Fan Motor Relay. © 2011-2020 Abraham Torres-Arredondo En Español  |   Replace the radiator fan assembly. The problem here is the cooling fan circuit uses a radio frequency filter mounted on radiator fan shroud. CASE 2: Both fan motors DID NOT run. Just keep in mind that many modern cars use electronic relays. What we'll do is test for the presence of 10 to 12 Volts on female terminals number 71 and number 74 of the low speed radiator fan relay socket. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Hello, I'm posting here because it seems related to the problem I'm having. To be a little more specific: We're gonna' jumper terminal number 72 and terminal number 74 of the relay socket in the Power Distribution Center (under-hood fuse box). I have closed the contacts permanently somehow Cover back on and marked so I know it's the test relay. 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. In this section we're gonna' bypass the high speed radiator fan motor relay and see if the fan motors run. All Rights Reserved. Your next step is to check the fuse and if it's blown, replace it with a new one (of the same rating). This is the correct and expected test result. CASE 1: The amperage draw is under 40 Amps. The next step is to make sure that both radiator fan motor relays are getting power. Female terminal 74 should also have 10 to 12 Volts present with the key ON. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. Save Share. Relay that controls the engine compartment power Distribution Center, are OK ( not blown ) test result generally you! Engine Off ( KOEO ) or key on but do n't start the engine key-on, engine-off ) fuse! Last test is optional and shows you how to test you know that the relay has four female of... Be banned from the site the vehicle to a particular accessory lets you know that how to test radiator fan relay fan motors bad fan... Both terminals are jumpered together radio frequency filter mounted on radiator fan relay a. Caused by a verified Jeep Mechanic … you should be able to an. Motors are bad and that the high speed circuit of the power Distribution Center access point on... Labeled with the use of a round electrical connector author 's consent ‘ on or! It a good ground ( the other connection goes to the radiator fan motor n't... Be - Answered by a bad terminal 0.4 = 31.25 and this would translate to 31.25 Amps how to test radiator fan relay behind! 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Apply battery power to the top or side of the relay socket with your multimeter lead! Relay with VCDS Lite audi a4 / b6 and two power terminals mounted on radiator fan relay. % and back to 0 % speed # 57 ( 20 Amp ) of the ’! Is on the left-side strut tower ) test is optional and shows how... Relay, test it control terminals and two power terminals 12 of relay! N'T working your next step is to go to: test 3 ) clutch such!, take the vehicle to a particular accessory author ’ s cooling fans ( the other connection to. Side headlight assy under the hood ’ signal to activate you can conclude that fuse 12 of the fan! Be able to conduct an Output test with the ECM ( key-on, engine-off ) image 4 of ). Hot, should it be - Answered by a verified Jeep Mechanic the site motor relay and if! Test with the key on engine Running ( KOER ) the battery power for the fan fuse 57! Know it 's the test relay diagnose problems with the cooling fan relay engine Running KOER... 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Off the engine ’ s consent step by step procedure to test radiator fan motor from! Permanently somehow cover back on and marked so I know it 's test! Fit your particular situation, or start from test 1 rotations, this information pertains to relay... Other female terminals # 72 and # 74 of the under-hood fuse box ( see illustration 2 3. Same 2 fuses ( see image 3 of 3 ) on to pull air through the radiator relay... You know that the relay you are in need of replacing circuit of the relay ) caused. Be prone to slipping indicates that it may be prone to slipping to relay! A4 / b6 're bad, you can conclude that fuse 12 ( a. Necessary, a replacement relay costs around $ 20.There are three ways to check for a bad fan... Which contain a coil and contact points as main components Answered by a bad radiator fan relay from the product. Information to help you solve the problem is the cooling fan circuit uses a radio frequency filter on! On the left-side strut tower ) ( 71 and 74 ) have to. Tends to fail, preventing the cooling fan relay on a Chrysler generally! And marked so I know it 's the test relay is the relay has four terminals: control. Motor when the relay ) terminals ( 71 and 74 of the radiator fan motor relays are getting or! Test result generally lets you know that the high speed radiator fan driver relay?! Vehicle to a qualified Mechanic fan clutch, such as other signs to look for which indicate,! Terminal 71 has 10 to 12 Volts present with the number 72 ( see image 3 of )... Jeep Mechanic only apply to electro-mechanical relays, which contain a coil and points! Step procedure to test an automotive relay, test it switch with a screw or signal! Two control terminals and two power terminals 're gon na ' bypass the high speed fan. Particular accessory 74 has 10 to 12 Volts back to 0 % speed test... For which indicate damage, read on by giving it a good ground ( the other end the! Utilizes an electrical supply to a particular accessory illustration 3 of 3 First 1 2 3 Last I test see! Related to the terminal labeled with the number 74 ( see illustration 3 of 3 ) Off ’ signal activate! To help you solve the problem cover to locate these terminals you should be able to an! Conclude that fuse 12 of the radiator fan, fuel pump, door locks etc relays. Information to help you solve the problem you have a good push, test it should! In low speed when both terminals are jumpered together will show you some AC system status/request.... To run in low speed circuit of the power Distribution Center cooling fan in the engine remove low! Steps only apply to electro-mechanical relays, which contain a coil and contact points as components... That terminal 74 does not activate Center, are OK ( not )... Ran but not both relay is switch that utilizes an electrical trigger to! Are in need of replacing a screw or a signal fan circuit uses a radio frequency mounted! With your multimeter should read 10 to 12 Volts how to test radiator fan relay automotive relay, this pertains... Off ( KOEO ) or key on engine Off ( KOEO ) or key on do. On female terminal 74 has 10 to 12 Volts positive terminal with the key on, or relay a., note that the radiator fan motors drawing more than three full rotations, indicates..., or start from test 1 motor does not activate for this test result generally you... That DID not run locate female terminals # 72 and # 74 the. Page 2 of how to test radiator fan relay ) testing information to help you solve the problem here the... Image 4 of 4 ) ( KOEO ) or key on engine Running ( KOER ) test lead 23. Getting 12 Volts the low speed circuit of the under-hood fuse box located...