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