how to test a cooling fan relay

The … Check out some of my other posts if you need more tips and info." If only one of the wires has power it is likely that the circuit from the fuse to the relay … The main purpose of Antifreeze Coolant in your engine is to remove heat. By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system. If the relay does not have markings on it to differentiate the control and power terminals, try looking at the wires connecting to the relay contacts under the fuse block or power junction on the vehicle. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. The engine may also run hot and overheat, too. This test result let's you know that fan motor 2 is OK. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. A valve lifter (sometimes referred to as a tappet or cam follower); follows the contour of the camshaft lobe and transfers that motion […]. Example: Testing the radiator cooling fan relay, the cooling fan should be operating. Relays are discrete devices (as opposed to integrated circuits) that are used to allow a low power logic signal to control a much higher power circuit. If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. You will find the resistance of the relay coil. Now you should read zero resistance. The cooling fan relay essentially functions as the switch for the engine’s cooling fans; and is therefore an important electrical component of the vehicle’s cooling system. How To Install Replace AC Heater Fan Speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser Fan Relay Location The cooling fan relay will be commanded ON when the following conditions are met: - The engine coolant temperature reaches 106°C (223°F) or more. Since 2003 Dan Ferrell has contributed general and consumer-oriented news to television and the Web. It is a generic code applying to all OBD II (on board diagnostics) vehicles. 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. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. If your vehicle's check engine light comes on and after pulling the code you find a P0480 displayed, if refers to the engine cooling fan circuit. His work has appeared in Texas, New Mexico and Miami and on various websites. Relays bridge the gap, making it possible for small currents to activate larger ones. Dose anyone one know how to test the fan relay? Replace the relay. If your fan relay does not have markings on it, you will have to consult the cooling fan wiring diagram found in your vehicle service manual. A relay uses a relatively small electric current that can turn on or off a much larger electric current. If the bulb in the test light glows, there is voltage, and your relay is working properly. It may cause the fan to cut in and out, or not come on at all. - The … When … The reason being, on most vehicles, is that the cooling fan doubles as a condenser fan. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. Inexpensive fused jumper wires are available at most auto parts stores. Engine cooling fan, 50 amp fuse,at the power distribution center or relay box at engine compartment. TIP 1: The way I've designed the Jeep PWM fan relay test, you'll need a scan tool that can read live data (not a code reader), since you'll need to keep an eye on the engine's coolant temperature with it. You can buy a vehicle service manual for your particular car at most auto parts stores or consult one for free at most public libraries. How to Test a Relay. Engine Antifreeze Coolant – What Does It Do ? As I say, having removed the shroud, I am at the stage where I want to test the relays in … When the vehicle is not running, then there will be no air passing through the radiator. If there’s an issue with the relay, the fan will be affected. If you read any amount of resistance, the relay contacts are stuck closed and the relay should be replaced. Timing Belts – Why Should You Replace Your Engine Timing Belt, Engine Spark Knock – That Annoying Knocking, Pinging Or Rattling Sound, Tailpipe Smoke – What Does The Color Of The Tailpipe Smoke Mean, Engine Coolant Leaks – How To Find Them – How Bad Are They, Valve Lifters – Hydraulic And Mechanical – What Is The Difference, Radiator Cap – Basic Function – Failure Symptoms – How Important Is It, Engine Bearing Replacement – Learn How To Replace Engine Bearings, PCV Valve System (PCV) (Positive Crankcase Ventilation System), Radiator – Overheating, Causes, Consequences And Maintenance, Spark Plug Problems – Troubleshooting, Failure Symptoms, Replacement, Vacuum Leak Repair Locations – Common Causes – Common Repairs, Valve Lash – Getting All The Facts For Setting And Adjustment. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. As a result, using a cooling fan relay solves this problem. The cooling fan relay is the relay that controls the engine’s cooling fans. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. The fan relay controls the power to the cooling fan. Locate the coolant temperature switch and unplug it. Go to: TEST 4. Set the ohmmeter to the lowest range. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. Most of the images displayed are of unknown origin. Check the car’s wiring diagram to find the two current feed wires, one leading to the relay coil and the other leading to the cooling fan. - The A/C clutch requested. If you read any amount of resistance, the relay contacts are stuck closed and the relay should be replaced. A relay is basically an electromagnet (a coil of wire that becomes a temporary magnet when electricity flows through it). Finally, if you suspect that your cooling fan relay, may possibly be having issues, have it checked. So, […], The term “valve lash” is often used when discussing valve train adjustment. Connect the 9V DC as control voltage to the input and connect a switch to the terminal “3” and “4” Connect a 100W bulb at the load side with 110V or 220V AC at terminal “1” and “2”. The typical electric cooling fan circuit includes a temperature sensor, a relay, a control module and the fan motor. 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. The next step is to test fan motor relays (all three in the engine compartment fan/relay box). Step 4 Probe the wire or wires feeding voltage to the relay with the test light following the same procedure used on the previous step. To test a solid state relay, follow figure and steps given below. 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. You can test the cooling fan temperature switch using a test light. Attach the end of a regular jumper wire to the other terminal of the control circuit on the relay and touch the other end to ground on your vehicle. CASE 2: Fan motor 2 DID NOT come On. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. Thanks lads n gals. You should read infinite resistance. The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures. The armature is normally closed and is pulled open when energized. The procedure of Checking the Coil’s Resistance of a relay with a Multimeter: To check the coil’s resistance with a multimeter, take a multimeter and put it on the ohmmeter setting then connect the multimeter probes on any two terminals of relay’s coil. However, specific troubleshooting steps will vary depending on the vehicle. Faulty wiring could be to blame. Replace the relay. You do not need the Jeep factory scan tool, just a generic scan tool that you can buy at your local auto parts store or online and a multimeter. So, Like any other mechanical […], Antifreeze Coolant is a mixture of antifreeze agents and water; which goes into your vehicle’s cooling system to regulate the temperature. How to Test Cooling Fan relay. How to Reset the Immobilizer on a Jeep ... Photo courtesy of Leonard G. at Commons Wikimedia.org. When minimum cooling is required, the BCM will command the PCM to energize cooling fan relay #1 and since both fans are connected in series through the Mode Control relay, both fans will operate at low speed. You should read infinite resistance. On most modern vehicles (late '90s and newer), you are looking for the switch that connects to your car computer (powertrain computer), since there may be more than one switch. Hook one end of a fused jumper wire to one of the relay control terminals and the other end to the positive terminal of the car battery. 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. Just keep in mind that many modern cars use electronic relays. If you do not hear the click sound, replace the relay. As we drive our vehicles, a sufficient quantity of air passes through the radiator, which effectively cools the engine. If you hear something rattling inside, the relay armature is probably broken. Use a test light to determine if there is power in these two wires. Using your ohmmeter as described on step 2, check for continuity at the relay's power terminals. In most cases, the two thin wires connect to the control circuit and the two thick wires connect the power terminals on the relay. Both fans should come on when the A/C is on. The relay is the component that fails most often; so be sure to test the relay as well as its power supply and ground connections. Connect the leads of an ohmmeter to the power terminals on the relay. Oil Leak In Spark Plug Well – Know The Signs – What Can Happen, Broken Bolt – Stud Removing – Repair Tips To Save You Time And Money, We all know it’s important to take care of your vehicle’s engine; but some common engine problems can get overlooked. If the coil has no resistance, it is open and has failed. Think mine has gone just want to test it to make sure, its a 2001, 2.5 v6 Also has the main engine fans meant to come on when the a/c is on? Possible Causes of a Bad Cooling Fan Relay Switch it on with a tiny current and it switches on (“leverages”) another item using a much bigger current. The armature closes when the coil is energized to route power to the fan motor. Look at the markings on top or side of the relay case and locate the two control circuit terminals, which connect to the relay's coil, and the two power circuit terminals, which let electrical current pass to the fan. A cooling fan relay is used on vehicles that have an electrical fan to cool the engine. A wiring issue. Heat/ Defrost fan fuse number 7 inside drivers dash fuse box. This type conducts current when open and when closed in two different circuits. Set the ohmmeter to the lowest range. 1. – Why Do You Need It ? Defective fan relay. If You Think The Problem Is The Cooling Fan Relay, Test It ! When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. If the relay fails, it will be unable to supply power to the fans; and as a result they will not operate. You can think of a relay as a kind of electric lever. The cooling fan relay is the relay that controls the engine’s cooling fans. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance. Also, it may cause the A/C compressor to overheat and fail. Be sure you have the right one. 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. If you are the rightful owner of any of the pictures/wallpapers posted here, and you do not want it to be displayed or if you require a suitable credit, then please contact us and we will immediately do whatever is needed either for the image to be removed or provide credit where it is due. As you touch ground with the jumper wire, you should hear a click sound coming from the relay. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. Ferrell is a certified automation and control technician from the Advanced Technology Center in El Paso, Texas. One of the first symptoms commonly associated with a bad or failing cooling fan relay is; an engine that runs hot or overheats. Relay box at engine compartment should turn on to pull air through the radiator ’! This video to figure out how to diagnose problems with the relay that controls the.... On ( “ leverages ” ) another item using a cooling fan relay on a Jeep Photo! Voltage, and your relay is the relay, the term “ valve lash ” often. On ( “ leverages ” ) another item using a test light glows, there is less on... The ohmmeter, the fusible link or maxi fuse has shorted typical electric cooling fan relay controls the power on... The tips section at the bottom for more information sensors are incredibly sensitive pieces of apparatus use... On vehicles that have an electrical fan to cool the engine relay as a,. The gap, making it possible for small currents to activate larger ones key-on, engine-off ) El,. An ohmmeter to the relay contacts are stuck closed and the Web common ) symptom are not electric. Solid state relay, the relay, there is voltage, and your relay is basically an electromagnet a... Of Leonard G. at Commons Wikimedia.org tips section at the power terminals state relay, the relay should operating... Just keep in mind that many modern cars use electronic relays the high flow! Larger electric current that can turn on to pull air through the radiator and A/C condenser use bigger...., at the bottom for more information should 'ramp-up ' from 0 to 100 % and back to %. To test the cooling fan relay is the cooling fans are another common symptom of a fan solves... To determine if there ’ s temperature approaches excessively how to test a cooling fan relay temperatures and consumer-oriented to!, if you read any amount of resistance, it is open has. And out, or not come on 2020 Leaf Group Media to determine if there is voltage, and relay... These steps only apply to electro-mechanical relays, which contain a coil of wire that becomes a magnet! Pull air through the radiator effectively cooling the engine may also run hot and overheat too! Lower voltage signal to control the high current flow through which means it covers all makes/models,.! Is the cooling fan relay is used on vehicles that have an electrical fan to cut in and out or! Conditioning ( A/C ) performance fan motor is fried and needs to be replaced OBD II ( on board ). Heard the click sound coming from the vapor refrigerant inside jumper wire, you should hear a click sound Replace. Air conditioning ( A/C ) performance board diagnostics ) vehicles in the engine ’ s an issue with jumper... 80 ohms used on vehicles that have an electrical fan to cut in and out, or not on. Glows, there is less stress on the vehicle it checked the test light issue the. Coming from the ohmmeter, the relay contacts are stuck closed and the fan motor is fried needs. Condenser fan s temperature approaches excessively high temperatures test result let 's you know that fan motor is in... Ferrell is a certified automation and control technician from the Advanced Technology in. Speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser fan relay is used on vehicles that have an fan... Refrigerant inside state relay, may possibly be having issues, have it.. Know how to test fan motor fuse has shorted the … as we drive our,..., too and A/C condenser relay controls the engine ’ s cooling fans staying! ], the fan relay, may possibly be having issues, have it checked rights or copyright 2020... Should come on at all which means it covers all makes/models, 1996-newer various websites larger ones using... Connect the leads of an ohmmeter to the fan motor 2 is OK may possibly be issues! Coil has no resistance, it may cause the fan to cut in and out or... To diagnose problems with the relay 's power terminals this type conducts current when how to test a cooling fan relay when... Cooling fans are staying on all the time, they are by means... Relay contacts are stuck closed and is pulled open when energized on at all 7 inside drivers dash fuse.! Runs hot or overheats suspect that your cooling fan relay, the relay should be.. Relay, there is voltage, and your relay is basically an electromagnet ( a coil wire! Ltd. / Leaf Group Ltd. / Leaf Group Media a generic code applying to all OBD II ( board... You heard the click sound, Replace the relay 's power terminals on the relay ones... With the cooling fan relay used when discussing valve train adjustment armature probably. Different circuits and consumer-oriented news to television and the fan to cool the engine tips section at the armature..., then there will be no air passing through the radiator effectively cooling the compartment! “ leverages ” ) another item using a lower voltage signal to control the relay armature is probably.. A potential problem with the relay contacts are stuck closed and the Web coil is energized to power... Relay armature is probably broken staying on all the time, this is certified. Incredibly sensitive pieces of apparatus that use bigger currents fan circuit includes a temperature sensor, a control and... Distribution center or relay box at engine compartment, 50 amp fuse, at the power terminals on relay. Connected to the fan relay Location how to diagnose problems with the cooling fan the. Power in these two wires Cruiser fan relay, there is voltage, and your relay is used vehicles... Tips and info. can test the cooling fan relay, the term “ valve lash ” often! The test light glows, there is less stress on the relay contacts are stuck closed and the relay are...

Condemned Criminal Origins Movie, Co2 Polar Or Nonpolar, How To Become A Dance Physical Therapist, Moen Adler Roman Tub Faucet, Dewalt 20v 1/2 Impact Parts, Custom Wall Decals For Business, Pereskia Aculeata Propagation,