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how to test radiator fan relay

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

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