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how to test a cooling fan relay

January 5th, 2021 by

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. A valve lifter (sometimes referred to as a tappet or cam follower); follows the contour of the camshaft lobe and transfers that motion […]. Since 2003 Dan Ferrell has contributed general and consumer-oriented news to television and the Web. 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. 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. The relay(s) are used to control the high current flow to power the cooling fan motors. See the Tips section at the bottom for more information. 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? Finally, if you suspect that your cooling fan relay, may possibly be having issues, have it checked. Ferrell is a certified automation and control technician from the Advanced Technology Center in El Paso, Texas. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. Check out some of my other posts if you need more tips and info." The … Dose anyone one know how to test the fan relay? 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. If the coil has no resistance, it is open and has failed. As I say, having removed the shroud, I am at the stage where I want to test the relays in … CASE 2: Fan motor 2 DID NOT come On. This type conducts current when open and when closed in two different circuits. 1. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. As we drive our vehicles, a sufficient quantity of air passes through the radiator, which effectively cools the engine. 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. In most cases, the two thin wires connect to the control circuit and the two thick wires connect the power terminals on the relay. Heat/ Defrost fan fuse number 7 inside drivers dash fuse box. If resistance is high, the coil may still be working but it is failing; or it may not work when electrical loads are high. The most common problem on these relays is an open or shorted coil and burned points that block the flow of electrical current after years of use. But often we need them to drive bigger pieces of apparatus that use bigger currents. The armature closes when the coil is energized to route power to the fan motor. Connect the leads of an ohmmeter to the power terminals on the relay. One of the first symptoms commonly associated with a bad or failing cooling fan relay is; an engine that runs hot or overheats. Engine cooling fan, 50 amp fuse,at the power distribution center or relay box at engine compartment. 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. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance. Connect your test light to battery ground. How to Test a Relay. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. How to Reset the Immobilizer on a Jeep ... Photo courtesy of Leonard G. at Commons Wikimedia.org. Most of the images displayed are of unknown origin. 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. If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. How to Test Cooling Fan relay. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. – Why Do You Need It ? 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. Checking the operation of a fan relay on your vehicle is an easy procedure. 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. Now you should read zero resistance. If You Think The Problem Is The Cooling Fan Relay, Test It ! Probe the wire coming out of the relay and going to the component with the tip of the 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. Be sure you have the right one. 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. 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. It may cause the fan to cut in and out, or not come on at all. The cooling fan relay is the relay that controls the engine’s cooling fans. 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Heater fan speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser fan relay is working properly fused jumper wires to. Ferrell is a certified how to test a cooling fan relay and control technician from the vapor refrigerant.... Tips and info. the bottom for more information or overheats in El Paso, Texas Think the problem the... In and out, or not come on drive our vehicles, is that the vehicle ’ s cooling....

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