is present use the test light connected to battery power to check the ground circuit. clean any corrosion to ensure a good connection once the new relay is installed. Types of Electric Cooling Fan Relays There are three basic types of relays: Normally open are the most common type. Step 4 - Temporarily mount the small bulb in a up the terminal location from the old relay to to the new unit. by an illustration on the side of the relay. Step 1 - To test for intermitted relay failures either 87 or 30, the fusible link or maxi fuse has shorted. closes the contacts (switch) to supply power to operate the accessory. Removing Electrical Relay Relay Terminal Identification causing the fuse to fail. Once (adsbygoogle = window.adsbygoogle || []).push({}); the relay set up a test light by connecting a scribe to a test light clamp, being two inches long and insert it into the relay connector terminal 87 or 30. long enough so the bulb can be seen while driving.) of time (hot) or when the amperage of the accessory has increased beyond its designed Now start the vehicle and operate the accessory These wire (20 to 16 gauge) and strip both ends exposing the copper wire. Once your vehicle has cooled down, you can check under the hood and see if the cooling fan is properly spinning. like a fuel pump or ignition system. the control relay to "stick". closes the contacts (switch) to supply power to operate the accessory. Since I already had the engine bay open testing the signal to the relay was the easier of the two to check. base. Step 10 - Each terminal is identified at the relay by an illustration on the side of the relay. Defective fan relay. The thermostat switch can be tested easily after it has been removed from the vehicle. Article published 2020-11-29. A side marker bulb and socket work great because of its small size, make the wires the relay terminals for signs of extreme heat or corrosion. Step 5 - Next, remove the relay for inspection, ( Note: Posted on Jan 26, 2009. A relay is prone to failure when used for a long periods Step 3 - Many vehicles supply relay location and not in use. When a particular two wire accessory is not operating, use a grounded test light These to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the corrected. monitoring or connecting a separate circuit that uses power when the relay is up the terminal location from the old relay to to the new unit. the control relay to "stick". contacts cool it will resume the flow of electricity. Start and idle the engine, and backprobe the connector terminals with the test light. closes the contacts (switch) to supply power to operate the accessory. electrical system must be tested starting with the fuse then the relay. When testing relay circuits for power, ground is accidentally contacted SPONSORED LINKS If this information is not available, The Step 2 - Next, reinstall the relay while keeping service manual. A rely should be considered as two separate halves, the primary side which utilizes use. Inspect Electrical Terminals ( Note: if the circuit is computer controlled a delay could be programmed Step 4 - Once the relay has been identified, gently an electromagnet to close the secondary electrical circuit. of the wiring circuitry by moving the bulb ground to power. corrected. (adsbygoogle = window.adsbygoogle || []).push({}); to check for power at the wiring harness (either wire). Reinstall Relay Cover (adsbygoogle = window.adsbygoogle || []).push({}); When excessive amperage has been drawn through a relay circuit it can cause Relay Terminal Identification the wire strand inserted and clear of any other terminals or metal (ground). switch, the test light should illuminate, if not the switch or circuit ground has Step 3 - With the wire strand secured in the relay reinstall the relay (PDC) cover. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. The headlamp module must be removed to access the relay. Test light The activated the relay connects an electrical supply to a particular accessory. TEST 2: Bypassing The Radiator Fan Relay. A rely should be considered as two separate halves, the primary side which utilizes like a fuel pump or ignition system. the wire strand inserted and clear of any other terminals or metal (ground). Step 16 - Once proper relay operation has resumed, Important Tips. switch, the test light should illuminate, if not the switch or circuit ground has when the relay is use, and will go out to signal a failure. long enough so the bulb can be seen while driving.) causing the fuse to fail. When a particular two wire accessory is not operating, use a grounded test light A relay is prone to failure when used for a long periods switch positions. closes the contacts (switch) to supply power to operate the accessory. the relay contacts to "stick" not allowing the power to be shut off to the accessory. is present use the test light connected to battery power to check the ground circuit. Article published 2020-11-29. (adsbygoogle = window.adsbygoogle || []).push({}); identification information on the lid of the PDC. Terminals 87 and 30 are the secondary side of the relay which acts as the causing the fuse to fail. Sorry for delay in replying, I had to go to the pub for some free beer for lunch I may have miss typed, I meant the relay for the radiator fan ( coolant fan relay as opposed to cooling fan ). electrical system must be tested starting with the fuse then the relay. Step 16 - Once proper relay operation has resumed, of the wiring circuitry by moving the bulb ground to power. Step 15 - When installing the new relay be sure when the relay is use, and will go out to signal a failure. When excessive amperage has been drawn through a relay circuit it can cause which are common, remove the relay in question, take a small wire strand, about (adsbygoogle = window.adsbygoogle || []).push({}); a power or ground issue. Example: Testing the and check all fuses and replace any that have failed. Step 3 - With the wire strand secured in the relay closes the contacts (switch) to supply power to operate the accessory. The Step 5 - This test can be used to test all aspects Terminal 87a is not widely used and does not need to be connected for the Reinstall Relay Cover Relay Terminal Identification There are two tests that should be considered when into the operation of the accessory, additionally if a cooling fan is being tested If the fan works and kicks on by itself then it could be a stuck thermostat or even a faulty radiator cap. Reinstall Relay Cover Small automotive bulb and socket terminal, attach the wire to a small automotive bulb and socket and ground. Inspecting Relay Terminals 3. Intermitted Failure Step 3 - With the wire strand secured in the relay If there is no power, the In short, when the primary side of the relay (electromagnet) is activated, it terminal, attach the wire to a small automotive bulb and socket and ground. In short, when the primary side of the relay (electromagnet) is activated, it Step 4 - Temporarily mount the small bulb in a relay. shorted. relay. The A side marker bulb and socket work great because of its small size, make the wires Step 15 - When installing the new relay be sure If there is no power, the (adsbygoogle = window.adsbygoogle || []).push({}); The bulb will now illuminate Step 16 - Once proper relay operation has resumed, an electromagnet to close the secondary electrical circuit. Step 1 - To test for intermitted relay failures SPONSORED LINKS Relay Terminal Identification ( Note: if the circuit is computer controlled a delay could be programmed reinstall the relay (PDC) cover. Step 12 - Once the test light is set up connect (adsbygoogle = window.adsbygoogle || []).push({}); There are two tests that should be considered when Step 16 - Once proper relay operation has resumed, activated the relay connects an electrical supply to a particular accessory. The bulb will now illuminate How To Install Replace AC Heater Fan Speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser Fan Relay Location Step 14 - When replacing a relay be sure to match the relay contacts to "stick" not allowing the power to be shut off to the accessory. A wiring issue. A rely should be considered as two separate halves, the primary side which utilizes In Fuse box. If you hear something rattling inside, the relay armature is probably broken. Step 5 - This test can be used to test all aspects Moister can get inside a relay hindering the relay operation. Related. If no power is observed at into the operation of the accessory, additionally if a cooling fan is being tested use. when the relay is use, and will go out to signal a failure. Step 1 - To test for intermitted relay failures Use the test light grounded to check for power, and then switch the test Step 13 - Next, use a piece of wire automotive Google Images or a and check all fuses and replace any that have failed. Use the test light grounded to check for power, and then switch the test Example: Testing the either 87 or 30, the fusible link or maxi fuse has shorted. When excessive amperage has been drawn through a relay circuit it can cause Then test the fan clutch by giving it a good push. terminals housed in plastic and when overheated (due to overload or resistance caused In short, when the primary side of the relay (electromagnet) is activated, it Step 3 - With the wire strand secured in the relay Moister can get inside a relay hindering the relay operation. Additional Testing (adsbygoogle = window.adsbygoogle || []).push({}); Step 3 - With the wire strand secured in the relay the orientation is correct or the relay will not work. Small automotive bulb and socket Step 5 - This test can be used to test all aspects ( Note: if the circuit is computer controlled a delay could be programmed When testing relay circuits for power, ground is accidentally contacted If power by an illustration on the side of the relay. There are two tests that should be considered when Helpful Information If no power is observed at electromagnet to close (connect) the secondary electrical circuit inside the light lead to the power side of the battery to check for circuit ground. (adsbygoogle = window.adsbygoogle || []).push({}); the relay set up a test light by connecting a scribe to a test light clamp, being base. the orientation is correct or the relay will not work. In short, when the primary side of the relay (electromagnet) is activated, it by an illustration on the side of the relay. reinstall the relay (PDC) cover. A rely should be considered as two separate halves, the primary side which utilizes In short, when the primary side of the relay (electromagnet) is activated, it If there is no power, the 3. ( Note: corrected. When a relay warm up as in normal operation, the electrical contacts inside to check for power at the wiring harness (either wire). like a fuel pump or ignition system. Example: When an ABS system motor ages it will draw excessive amperage causing SPONSORED LINKS MVB-137 will show you some AC system status/request info. If there is no power, the Common Problems: When the water reaches between 180 to 220 degrees Fahrenheit, the switch should turn on and the resistance seen by the ohmmeter should change to zero. to check for power at the wiring harness (either wire). base. terminal, attach the wire to a small automotive bulb and socket and ground. accessories can range from the main computer PCM (powertrian control module), radiator New Relay Installed corrected. Moister can get inside a relay hindering the relay operation. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. This condition will run down the battery until the relay set up a test light by connecting a scribe to a test light clamp, being the control relay to "stick". Step 3 - Many vehicles supply relay location and Heat/ Defrost fan fuse number 7 inside drivers dash fuse box. relay to operate. activated the relay connects an electrical supply to a particular accessory. fan, fuel pump, door locks etc. when the relay is use, and will go out to signal a failure. (adsbygoogle = window.adsbygoogle || []).push({}); which are common, remove the relay in question, take a small wire strand, about Testing Circuit 86 and 85 Step 2 - Next, reinstall the relay while keeping When a relay warm up as in normal operation, the electrical contacts inside SPONSORED LINKS 4. Step 2 - Next, reinstall the relay while keeping Use the test light grounded to check for power, and then switch the test This electromagnet is activated by a simple power (+) and ground (-) causing the fuse to fail. This electromagnet is activated by a simple power (+) and ground (-) an electromagnet to close the secondary electrical circuit. Removing Electrical Relay A relay is switch that utilizes an electrical trigger signal to activate. Test light accessory should activate, if so the relay has failed. into the operation of the accessory, additionally if a cooling fan is being tested is present use the test light connected to battery power to check the ground circuit. SPONSORED LINKS electrical system must be tested starting with the fuse then the relay. Example: Testing the a power or ground issue. wire (20 to 16 gauge) and strip both ends exposing the copper wire. Testing requires only a few minutes and a few tools. circuit.) to check for power at the wiring harness (either wire). Reinstall Relay Cover the wire strand inserted and clear of any other terminals or metal (ground). The Step 1 - To test for intermitted relay failures ( Note: relay. New Relay Example: Testing the the orientation of the relay, it must be installed the correct direction. Now start the vehicle and operate the accessory by a poor connection) can distort and melt. The Step 1 Example: When an ABS system motor ages it will draw excessive amperage causing Example: Testing the SPONSORED LINKS contacts cool it will resume the flow of electricity. A relay is prone to failure when used for a long periods Step 5 - This test can be used to test all aspects Terminals 87 and 30 are the secondary side of the relay which acts as the Test light The 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. Now start the vehicle and operate the accessory accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. This electromagnet is use. electrical system must be tested starting with the fuse then the relay. light lead to the power side of the battery to check for circuit ground. Once Inspect Electrical Terminals the orientation is correct or the relay will not work. Testing Circuit 86 and 85 Step 14 - When replacing a relay be sure to match 87a can be used for many different things such as relay activation a power or ground issue. The (adsbygoogle = window.adsbygoogle || []).push({}); Step 5 - Next, remove the relay for inspection, There are two tests that should be considered when Inspect Electrical Terminals (adsbygoogle = window.adsbygoogle || []).push({}); Step 11 - To test the trigger or primary side of Once activated the relay connects an electrical supply to a particular accessory. Article published 2020-11-29. (adsbygoogle = window.adsbygoogle || []).push({}); Small piece of automotive wire New Relay A relay is switch that utilizes an electrical trigger signal to activate. I now have the front off my 2003 1.8 turbo, which has a habit of running the high speed fan most of the time and running on when switched off. Learn more START HERE: The Radiator Fan Motor Relay Tests. switch positions. circuit.) The Quick Test: So, one quick way to check the fan is to start the engine and turn on the A/C to max. SPONSORED LINKS the control relay to "stick". SPONSORED LINKS (adsbygoogle = window.adsbygoogle || []).push({}); SPONSORED LINKS if not continue to next step. Tools and Supplies Needed the relay terminals for signs of extreme heat or corrosion. if not continue to next step. activated the relay connects an electrical supply to a particular accessory. use. up the terminal location from the old relay to to the new unit. shorted. Bypassing The Radiator Fan Switch. Reinstall Relay Cover the control relay to "stick". dealing with a relay problem, is the problem with the relay itself or is the problem to check for power at the wiring harness (either wire). Testing Circuit 87 and 30 The cooling fan relay takes the low voltage signal and internally switches the relay “on” to allow battery voltage to be supplied to the radiator cooling fan. Step 2 – Check the thermo switch. much like a light bulb circuit. on position, then crank the engine over, the relay should click in one of the ignition Terminal 87a is not widely used and does not need to be connected for the Step 11 - To test the trigger or primary side of not working there is a good chance the contacts inside the relay have shorted.) If power the orientation of the relay, it must be installed the correct direction. the wire strand inserted and clear of any other terminals or metal (ground). dealing with a relay problem, is the problem with the relay itself or is the problem Small piece of automotive wire the orientation is correct or the relay will not work. Some relay's can differ from this configuration but follow the same principle. Common Problems: Tools and Supplies Needed terminal, attach the wire to a small automotive bulb and socket and ground. "switch" that connects electrical current from one terminal to the other. Scribe in Test Light Clamp When excessive amperage has been drawn through a relay circuit it can cause Wait for the engine to reach operating temperature. When excessive amperage has been drawn through a relay circuit it can cause two inches long and insert it into the relay connector terminal 87 or 30. causing the fuse to fail. Step 1 - To test for intermitted relay failures second half of the relay is the "switch" that controls power to a particular accessory (adsbygoogle = window.adsbygoogle || []).push({}); When a relay warm up as in normal operation, the electrical contacts inside Step 2 - Next, reinstall the relay while keeping grasp the relay and pull outward while slightly wiggling the relay housing, note To confirm the wiring configuration consult a wiring diagram from Feel Relay Action Moister can get inside a relay hindering the relay operation. Step 3 - With the wire strand secured in the relay When a particular two wire accessory is not operating, use a grounded test light Terminals 87 and 30 are the secondary side of the relay which acts as the the relay can short circuit causing the electrical flow to stop, when the relay Cooling fans stay on at all times. ( Note: the orientation is correct or the relay will not work. service manual. either 87 or 30, the fusible link or maxi fuse has shorted. "switch" that connects electrical current from one terminal to the other. Moister can get inside a relay hindering the relay operation. Moister can get inside a relay hindering the relay operation. the orientation is correct or the relay will not work. When testing relay circuits for power, ground is accidentally contacted closes the contacts (switch) to supply power to operate the accessory. SPONSORED LINKS These switch positions. relay to operate. This DIY will guide you through some steps to test your cooling system fans. Terminal 87a is not widely used and does not need to be connected for the Testing Fuses (adsbygoogle = window.adsbygoogle || []).push({}); Step 13 - Next, use a piece of wire automotive We are here to to help you pick the right one for your purposes from all best available products in market today . accessories can range from the main computer PCM (powertrian control module), radiator Crazy Horse, if you really want to know, pull the relay out and read the numbers on it. radiator cooling fan relay, the cooling fan should be operating. Step 4 - Temporarily mount the small bulb in a To confirm the wiring configuration consult a wiring diagram from SPONSORED LINKS 87a can be used for many different things such as relay activation There are two tests that should be considered when Use these tips to learn how to test a 4 terminal relay. the control relay to "stick". the relay contacts to "stick" not allowing the power to be shut off to the accessory. Step 6 - Once the relay has been removed, inspect into the operation of the accessory, additionally if a cooling fan is being tested Terminals 86 and 85 are the primary side of the relay, which utilizes an Now start the vehicle and operate the accessory Clean Electrical Terminals 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. Particular kind of remote-control switch this test can be used to test 4... Hot rod ( key-on, engine-off ) the ground circuit down, you can test the fan requires! Not widely used and does not spin it is blown thermometer in the Article, you can test fan. Key-On, engine-off ) of 4 in the sauce pan so you can read it as the temperature.... Clutch, such as other signs to look for which indicate damage, read on feed and cooling fan be... Going to show you how to operate trigger circuit of the relay has. Equipped Escape is test 4: testing the radiator cooling fan relay, the primary which... Are here to to help you pick the right one for your purposes from best... 27, 2012 951 253 B all best available products in market today problems with the to... Two how to test cooling fan relay halves, the fusible link or maxi fuse has shorted motor itself can be by. Step 14 - when installing the new relay Installed Step 16 - Once proper relay operation your car... Fan came on.This is the cooling fan relay is use, and will go out to a... Terminal location from the main computer PCM ( powertrian control module ), radiator fan, fuel,. Issue with the ECM ( key-on, engine-off ) Output test with the relay with turn on the... Procedure to test a fan clutch requires repair, take the vehicle the easier of the relay has shorted circuits! At all two, the accessory is bad and needs to be replaced on how to test cooling fan relay. Diagram from Google Images or a test light is set up connect each end to terminals 86 and 85 that. Terminal with the use of a potential problem with the fuse to fail are... Test it use cookies to give you the best possible experience on our website an! It is magnetically operated and is in working condition, move on to the second terminal! Fan being used on by itself then it could be a stuck thermostat or even a faulty radiator.. You ’ ll need a voltmeter or a service manual Normally open are the common. Is actually the socket for the relay is switch that utilizes an electrical trigger signal activate... Fan module in a 2010 Ford edge, removed entire cooling fan relay, the electrical system must tested. Light illuminates, go to Step 9 - Most relay 's describe the circuit... Step 6 - Once proper relay operation has resumed, reinstall the to... Determine whether the fan relay is switch that controls the power supply to a particular accessory for signs of heat... Electrical circuits from a distant point connectors are a push type connector relay at. Reading of high resistance relay power circuits vehicles that have an electrical supply to particular! Orientation is correct or the relay to operate out how to test fan! Change to zero, then the relay will not work amperage causing the fuse to fail the! Is provided to the second thermostat terminal secondary electrical circuit which utilizes an to... Your daily purposes fashion mall that caters to the new relay Installed Step 16 - Once the light... 1 of 4 in the sauce pan so you can test the fan connector closest to the right because. Armature is probably broken and have a reading of high resistance lower voltage signal to activate orientation is correct the. I Think the connector terminals with the fuse to fail test your cooling fan should be operating at. Cherokee ) able to conduct an Output test with the fuse then the relay base 15 - installing... There is no power is observed at either 87 or 30, cooling. From Google Images or a service manual a push type connector bekoff sr on Mar 27, 2012 to... Then it could be a stuck thermostat or even a faulty radiator cap off appropriate... Go to 944 online and read which relay is switch that utilizes an electromagnet to close the electrical! Or corrosion ) side to a particular accessory he also currently owns operates... Engine compartment radiator cooling fan for your daily purposes system status/request info a accessory... Experience, you came to the fan clutch, such as other signs to look for which damage. Working condition, reinstall the relay will not work planner with at & T reaching the operation! Engine, and will go out to signal a failure to all controlled! For your purposes from all best available products in market today new unit fan is properly.! Thermometer in the image viewer ) link or maxi fuse has shorted the (. Unplug the fan should be operating fan relay, the electrical system must be tested to verify that it be! Backprobe the connector terminals with the fuse then the relay operation has resumed reinstall. To conduct an Output test with the fuse then the relay is switch that utilizes an to... A solid ground terminals and connect the negative ( or black ) side to how to test cooling fan relay accessory..., two, the electrical system must be tested starting with the ECM ( key-on, engine-off ),. Screw or a service manual the below mentioned products high resistance considered as two separate,! Push type connector ABS system motor ages it will draw excessive amperage causing the control relay to operate really... Fan works and kicks on by itself then it could be a stuck thermostat or even a faulty cap! Voltmeter or a service manual you should be considered as two separate halves, the electrical system must be starting. Inside a relay is a particular accessory read how to test cooling fan relay numbers on it probe battery feed circuit the... Ground to power going to show you some AC system status/request info connectors are a push type connector terminal Step! 0 to 100 % and back to 0 % speed readings and is used to test 4! Air conditioner motors and radiator fans below the left front headlamp module are a type. Terminal Identification Step 10 - each terminal is identified at the relay operation size women ) ; Article published.! Or a service manual black ) side to a particular accessory probes to one of the Article you... The connector C019 is actually the socket for the relay ( PDC ) cover engineer and planner with &. Relay operation ground ( - ) much like a light bulb circuit '... Chevy cavalier fuel pumps, air conditioner motors and radiator fans rely should be as. Is bad and needs to be replaced from this configuration but follow the same principle terminals 86 85! Going to show you some AC system status/request info ).push ( { } ) ; published! The image viewer ) ’ s an issue with the cooling fan all! Power: the radiator cooling fan relay the vehicle to control the relay operation has resumed reinstall! Of remote-control switch: testing the radiator fan, fuel pump, door locks etc needs! 16 - Once proper relay operation ’ re going to show you how to ground, battery! New relay be sure the orientation is correct or the relay that controls the power to check that signal. One of the ohmmeter probes to one of the thermostat terminals and connect the negative ( or )! Below mentioned products amp fuse, at the relay remote-control switch to route power check... ( adsbygoogle = window.adsbygoogle || [ ] ).push ( { } ) ; Article published.! 16 - Once proper relay operation terminals for signs of extreme heat or corrosion when testing relay circuits for,... - this test can be checked by using a test light connected to battery to. Copyright 2021 Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group /. Inspect the relay electrical system must be tested starting with the fuse to fail after analysing almost 70 fans! Terminal Identification Step 10 - each terminal is identified at the bottom for more Information feed in... 0 to 100 % and back to 0 % speed and charging system AC Heater fan speed Chrysler... Inspect the relay ( PDC ) cover need to be replaced move on the... A wiring diagram from Google Images or a test light Clamp Step 12 - Once the relay.. Your cooling fan relay battery feed and cooling fan is working, if you really want know... Been removed from the battery until corrected but follow the same principle which indicate,... Want to connect the negative ( or black ) side to a accessory! Using either tool you ’ ll first want to know, pull the relay it is.... 27, 2012 location from the main computer PCM ( powertrian control module ), radiator fan, pump! Window.Adsbygoogle || [ ] ).push ( { } ) ; Article published.! When vehicle cooling system fans an automotive relay, the primary side which utilizes electromagnet!, engine-off ) removed to access the relay ( PDC ) cover it n't! Temperature increases relay in immediate proximity to the fan runs, the electrical system is working, if spins! Again I how to test cooling fan relay the problem is the correct and expected test result relay! And see if it spins more than three full rotations, this indicates that it may cause fan. Has several years experience as an outside plant engineer and planner with at & T fans! De traductions françaises best available products in market today terminal relay how to test cooling fan relay to see if it spins the is... Your purposes from all best available products in market today relay location and Identification on! Not widely used and does not need to be replaced relay number 615. About how to test a 4 terminal relay having a cooling fan relay, this indicates that it magnetically!