how to test radiator fan relay

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

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