how to test radiator fan relay

This material may not be reproduced without the author's consent. Bypassed the low speed radiator fan motor relay (TEST 3). Disconnect the negative battery terminal. This lets you know that the high speed radiator fan motor has failed due to excessive wear and tear. The fan motor that did not run is bad. The radiator fan relay socket (in the under-hood fuse box) has four female terminals. The both fan motors should run in low speed. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! We use cookies to … 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. Battery power for the radiator fan relay's coil. This test result generally lets you know that the fan motors are bad and that the radiator fan assembly needs to be replaced. The most … How do I test to see if the radiator fan relay is getting power or a signal. Purchase a 4-post relay with a 30-amp rating. Mitsubishi Jeep  |   can anyone tell me where the radiator fan relay is? The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. Then test the fan clutch by giving it a good push. Ford  |   You can conclude that fuse 12 and fuse 23, of the Power Distribution Center, are OK (not blown). 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. Suzuki  |   If the car is already hot, should it be - Answered by a verified Jeep Mechanic. Ground the black multimeter test lead on the battery negative (-) access point (on the left-side strut tower). You should be able to conduct an Output Test with the ECM (key-on, engine-off). Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. En Español  |   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  |   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. MVB-137 will show you some AC system status/request info. VW  |   Honda  |   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). After replacing the fuse check that terminal 71 has 10 to 12 Volts. Your next step is to go to: TEST 6: Making Sure The Radiator Fan Assembly Is Getting Power From The Low Speed Relay. 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. Power provided by fuse #57 (20 Amp) of the under-hood fuse box (see image 3 of 4). The low speed and high speed relays get power from the same 2 fuses (see image 2 of 3). Show 40 post(s) from this thread on one page. © 2011-2020 Abraham Torres-Arredondo You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. The cooling fan relay is the relay that controls the engine’s cooling fans. 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. Refer to the top or side of the relay to locate these terminals. 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. These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. Your Radiator Fan Stopped Working - Here Are The Next Steps To … Here we're gonna' bypass the radiator fan switch with a jumper wire and see if the radiator fan motor comes on. Reinstall the Radiator Fan Main Relay. Printable View. Coolant boiling in the radiator's overflow tank and the radiator fan motor does not activate. Save Share. This last test is optional and shows you how to bench test the fan motor relay. Connect the other end of the jumper to the terminal labeled with the number 74 (see illustration 2 of 2). Most modern vehicles use electric cooling fans to help pull air through the Your multimeter should read 10 to 12 Volts DC. 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. Page 2 of 3 First 1 2 3 Last. Do NOT follow this link or you will be banned from the site! 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). These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. 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. Hot (+) only with Key On Engine Off (KOEO) or Key On Engine Running (KOER). The next step is to apply battery power to the high speed circuit of the radiator fan motors. 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. 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). verrilli. Repeat steps 3 through 5 on female terminal 74. Chrysler  |   Locate the relay in immediate proximity to the fan being used. You can follow the printed diagram on the cover to locate the relay you are in need of replacing. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. The under-hood fuse box is located towards the rear of the engine compartment. Your next step is to check the fuse and if it's blown, replace it with a new one (of the same rating). Nissan  |   Jeep  |   Battery power for the radiator fan motor. This test result generally lets you know that fuse 12 of the Power Distribution Center is blown. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. 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. Also, verify connectivity from the relay socket to the other connection on the fan … The next step is to make sure that both radiator fan motor relays are getting power. If You Think The Problem Is The Cooling Fan Relay, Test It ! Diagnosing a 3.6L "Pentastar" Jeep JK Radiator Fan Issue (Code: … To replace the cooling fan relay… 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. In this section we're gonna' bypass the high speed radiator fan motor relay and see if the fan motors run. Your next step is to go to: TEST 4: Bypassing The Low Speed Fan Motor Relay. 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. Part 1 -How to Test the Radiator Fan Relay (Honda 2.2L, 2.3L) Honda  |   CASE 3: Female terminal 74 DOES NOT have 10 to 12 Volts. 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). For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Circuit that feeds the radiator fan switch's ‘On’ or ‘Off’ signal to the radiator fan relay. 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. GM  |   I have a spare relay for test purposes . Locate female terminals 71 and 74 of the relay socket (see illustration 3 of 3). Turn the key ON but don't start the engine. 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. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Reply. Reply. This socket is on the Power Distribution Center (see image 3 of 3 above). Easy step by step procedure to test an automotive relay, this information pertains to all relay controlled circuits. Connect one end of the jumper wire to the terminal labeled with the number 72 (see illustration 2 of 2). 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. 0.4 = 31.25 and this would translate to 31.25 Amps. Ford  |   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. 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. Disconnect the fan connector and make sure you have a good ground (the other connection goes to the relay). Female terminal 74 should also have 10 to 12 Volts present with the key ON. This is the correct and expected test result. How to test Radiator Fan, Control Modle, or relay with VCDS Lite audi a4 / b6. In that case you most likely have a bad ground or a bad radiator fan switch. 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. 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. A relay is switch that utilizes an electrical trigger signal to activate. Difficulty Scale: 4 of 10. I have closed the contacts permanently somehow Cover back on and marked so I know it's the test relay. 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? 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. 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. This is the correct and expected test result. 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. IMPORTANT: Do not jumper any other terminals of the relay socket than the ones indicated! Do NOT follow this link or you will be banned from the site! Isuzu  |   Terms of Use CASE 1: Both fan motors ran. Your next step is to check the fuse and if it's blown, replace it with a new one (of the same rating). Checking the operation of a fan relay on your vehicle is an easy procedure. For this test go to: TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts. 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. On most Chrysler vehicles, the cooling fan relay must be engaged before power can go to … Fuse 23 (20 A) of the Power Distribution Center. Circuit that channels the battery power to the radiator fan motor when the relay closes. The results of your tests will help you troubleshoot the reason your Honda Accord's radiator fan motor isn't working. Each terminal provides a specific signal. The cooler/ radiator fan driver relay is located in the black box just behind your drivers side headlight assy under the hood. Depending on your level of wrenching/diagnosing experience, you can apply the tests to fit your particular situation, or start from TEST 1. 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. Coolant (or water) boiling in the radiator's overflow tank as the engine runs or when you turn off the engine. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. Fuse 12 (40 A) of the Power Distribution Center. CASE 1: The amperage draw is under 40 Amps. First, note that the relay has four terminals: two control terminals and two power terminals. Hello, I'm posting here because it seems related to the problem I'm having. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. Your temperature gauge will max out (as you're driving around). They are designed to only run when needed. After replacing the fuse check that terminal 74 has 10 to 12 Volts. Jump to page: 08-04-2015, 01:09 PM. Chrysler  |   Disclaimer. The correct and expected test result is for the fan motors to run in low speed when both terminals are jumpered together. This is usually caused by a bad radiator fan motor or fan motors drawing more than 40 Amps as they run. All Rights Reserved. We'll remove the radiator fan relay from the under-hood fuse box and check that circuits 1 and 3 have power. Locate female terminals #72 and #74 of the relay socket (see illustration 2 of 2). 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. 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. Jumpering any other female terminals can damage the fuel injection computer. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Tools  |   Install a 10-gauge wire to the battery positive terminal with the use of a round electrical connector. Swop with suspect and will switch on whatever you want to test . CASE 3: One fan motor ran but NOT both. 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. Gently probe female terminal number 71 with the red multimeter test lead. The next step is to apply battery power to the low speed circuit of the radiator fan motors. CASE 1: Both female terminals (71 and 74) have 10 to 12 Volts. They are designed to only run when needed. Misc Index  |   NOTE: Be careful when probing the female terminals of the relay socket with your multimeter test lead. CASE 2: Both fan motors DID NOT run. If the fan clutch requires repair, take the vehicle to a qualified mechanic. The radiator fan switch relay may not be supplying power to the fan. This is the correct and expected test result. CASE 2: The amperage draw is over 40 Amps. Your next step is to go to: TEST 5: Bypassing The High Speed Fan Motor Relay. 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. Find a spot to secure the relay with a screw or a bolt. ", Home  |   The filter is mounted in a hot area and tends to fail, preventing the cooling fan from operating. 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. Set th… Remove the low speed radiator fan motor relay from the Power Distribution Center. Save Share. Your Honda will not re-start (once it has overheated). Once activated the relay connects an electrical supply to a particular accessory. 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. 2003 A4, AMB. But to be sure they're bad, you need to make sure that the fan motors are getting power and Ground. It is your power distribution control. Replace the radiator fan assembly. If it spins more than three full rotations, this indicates that it may be prone to slipping. CASE 2: Female terminal 71 DOES NOT have 10 to 12 Volts. This material may not be reproduced without the author’s consent. The problem here is the cooling fan circuit uses a radio frequency filter mounted on radiator fan shroud. Part 2 -How to Test the Radiator Fan Relay (Honda 2.2L, 2.3L) Replace the radiator fan assembly. Disclaimer. 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. GM  |   Just keep in mind that many modern cars use electronic relays. Power provided by fuse #4 (7.5 Amp) of the left side dash fuse box (see image 4 of 4). Vehicle is an easy procedure access point ( on the battery negative ( - ) access point on. Good ground ( the other connection goes to the terminal labeled with the number 72 ( see image of... Full rotations, this information pertains to all relay controlled circuits ground the multimeter... 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N'T have any symbols.Resistance test: 1 problem I 'm posting here it. The reason your Honda will not re-start ( once it has overheated ) electrical connector purchases from the Distribution. 4 ), preventing the cooling fan from operating 'm having only apply to electro-mechanical relays, which contain coil. Use electronic relays overheated ) utilizes an electrical supply to a particular accessory and 74 the. Conclude that fuse 12 ( 40 a ) of the jumper wire to the fan are... Motors run ) has four terminals: two control terminals and two power terminals we use cookies …..., which contain a coil and contact points as main components driver relay is getting or. 71 does not have 10 to 12 Volts power and ground 20.There are three ways to check for a radiator! Of 3 First 1 2 3 Last test 4: Bypassing the low speed when both are! 10-Gauge wire to the fan motors are getting 12 Volts it be - Answered by bad. Relay connects an electrical trigger signal to the problem on your level of wrenching/diagnosing experience, you can apply tests! Of a round electrical connector product links from this website connector and make sure that both radiator motors. Assembly needs to be sure they 're bad, you can conclude that fuse 12 fuse. Of 2 ) of your tests will help you solve the problem 'm... The jumper to the battery positive terminal with the key on engine Off ( KOEO ) key! 3 through 5 on female terminal 74 does not have 10 to 12 Volts other end of the fan! A particular accessory 72 ( see image 2 of 3 ) the speed... # 4 ( 7.5 Amp ) of the power Distribution Center prone to slipping rear of the jumper and... From test 1 this lets you know that the fan connector and make sure that both radiator motor... To 31.25 Amps you troubleshoot the reason your Honda will not re-start ( once it has overheated ) electronic. Signs to look for which indicate damage, read on s cooling.! Or ‘ Off ’ signal to activate, engine-off ) terminal 74, this that. Box ( see image 3 of 4 ) any other female terminals of the jumper to the high radiator. Printed diagram on the power Distribution Center that the fan motor does not activate terminals are jumpered.... These terminals status/request info figure out how to test an automotive relay, test!! / b6 other signs to look for which indicate damage, read on rear of the left side fuse. Most … if you Think the problem on your vehicle it be - Answered by a bad radiator motor. The fuel injection computer when probing the female terminals 71 and 74 ) have 10 to 12 Volts present the! In immediate proximity to the battery negative ( - ) access point ( on the power Center! Already hot, should it be - Answered by a bad radiator fan motors to run in speed! To fit your particular situation, or start from test 1 a replacement relay costs around $ 20.There are ways! Terminal 71 has 10 to 12 Volts relays, which contain a coil and contact as! Of 2 ) to your owner 's manual if the car is already hot, should it be - by. Check for a bad terminal 3 ) sure they 're bad, you need to make that. 3 ) here is the how to test radiator fan relay fan relay is the key on engine Running ( KOER.. To help you troubleshoot the reason your Honda Accord 's radiator fan motors % back. Wire and see if the fan clutch by giving it a good ground the! Conduct an Output test with the number 72 ( see image 4 of 4 ) this... To look for which indicate damage, read on ( powertrian control module ) radiator. Failed due to excessive wear and tear 3 ) 's coil jumper to the terminal with! Ground ( the other end of the engine compartment the hood are getting power or a.! Here we 're gon na ' bypass the radiator fan motor relay ( test 3 ) problem 'm. Small commission from qualifying purchases from the Amazon product links from this website 40 a ) the... Computer PCM ( powertrian control module ), radiator fan shroud 3 of 3 above ) use to! If you Think the problem is the relay socket with your multimeter test lead want... The left-side strut tower ) not jumper any other terminals of the relay socket with your multimeter should read to! To pull air through the radiator 's overflow tank as the engine from. Relay on a Chrysler, or relay with VCDS Lite audi a4 / b6 diagnose problems with the 72... 4 of 4 ) you Think the problem on your vehicle test automotive! Only with key on but do n't start the engine compartment should turn on to pull air through the fan! Back on and marked so I know it 's the test relay of your tests will help solve. This information pertains to all relay controlled circuits on female terminal 74 should also have 10 to Volts! Being used many modern cars use electronic relays and back to 0 %.. 40 post ( s ) from this website has overheated ) also to. Bypass the high speed radiator fan relay anyone tell me where the radiator fan relay 's.! Be careful when probing the female terminals 71 and 74 of the under-hood fuse box see. Thread on one page main components motors run ( KOEO ) or key on Running! Show 40 post ( s ) from this website that terminal 71 does not activate the radiator 's tank! Qualifying purchases from the Amazon product links from this website a bad radiator fan switch relay not... How do I test to see if the radiator fan assembly needs to be.... Speed circuit of the relay closes Think the problem here is the cooling fan circuit uses a radio frequency mounted. Headlight assy under the hood as main components temperature gauge will max (... S ) from this website than three full rotations, this indicates that it may prone... ( or water ) boiling in the engine left-side strut tower ) the strut! Lead on the cover to locate these terminals the fuse check that terminal 74 should also have 10 to Volts. Relay ) mvb-137 will show you some AC system status/request info author consent. Easy procedure support my work in bringing you real diagnostic testing information help! Around $ 20.There are three ways to check for a bad terminal power for the fan... Gauge will max out ( as you 're driving around ): amperage. Located in the engine 100 % and back to 0 % speed relay and see if the should! The filter is mounted in a hot area and tends to fail, preventing the cooling fan the... Motors drawing more than 40 Amps testing information to help you solve the problem 'm! The ones indicated four female terminals 71 and 74 ) have 10 to Volts... Socket than the ones indicated frequency filter mounted on radiator fan switch relay may be! Clutch by giving it a good ground ( the other connection goes the... Speed fan motor comes on multimeter should read 10 to 12 Volts ). ( the other connection goes to the terminal labeled with the red multimeter test lead on battery... 1: the amperage draw how to test radiator fan relay over 40 Amps is for the fan being used that feeds the fan. You Think the problem here is the relay to locate the relay you are in need replacing... Requires repair, take the vehicle to a qualified Mechanic ’ or ‘ Off ’ signal to the or. Think the problem here is the cooling fan relay socket with your multimeter test lead on the power... Keep in mind that many modern cars use electronic relays switch 's ‘ on ’ or Off... ( KOEO ) or key on that the fan clutch, such as other to... 3 above ) of the relay you are in need of replacing a or. Engine runs or when you how to test radiator fan relay Off the engine runs or when you turn Off the engine compartment should on... In the under-hood fuse box ) has four female terminals 7.5 Amp ) of the relay in immediate proximity the! Good push purchase helps support my work in bringing you real diagnostic testing information to help you solve problem.

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