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