The cooling fan relay is the relay that controls the engine’s cooling fans. Thanks lads n gals. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. Heat/ Defrost fan fuse number 7 inside drivers dash fuse box. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. Finally, if you suspect that your cooling fan relay, may possibly be having issues, have it checked. 1. One of the first symptoms commonly associated with a bad or failing cooling fan relay is; an engine that runs hot or overheats. As you touch ground with the jumper wire, you should hear a click sound coming from the relay. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. Set the ohmmeter to the lowest range. Possible Causes of a Bad Cooling Fan Relay When … A valve lifter (sometimes referred to as a tappet or cam follower); follows the contour of the camshaft lobe and transfers that motion […]. Set the ohmmeter to the lowest range. Example: Testing the radiator cooling fan relay, the cooling fan should be operating. 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. - The … By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system. Since 2003 Dan Ferrell has contributed general and consumer-oriented news to television and the Web. This type conducts current when open and when closed in two different circuits. 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. As the name suggests, many sensors are incredibly sensitive pieces of electronic equipment and produce only small electric currents. Why is that useful? How To Install Replace AC Heater Fan Speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser Fan Relay Location You should read infinite resistance. A relay uses a relatively small electric current that can turn on or off a much larger electric current. 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. The Next Thing To Test Is The Coolant Switch Or Sensor On most systems; there is a coolant temperature switch that turns the fans on and off. Pip 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”. As a result, using a cooling fan relay solves this problem. Also, it may cause the A/C compressor to overheat and fail. If the bulb in the test light glows, there is voltage, and your relay is working properly. Probe the wire coming out of the relay and going to the component with the tip of the test light. - The A/C clutch requested. The … You should read infinite resistance. This tells you that the cooling fan motor is fried and needs to be replaced. The cooling fan relay is the relay that controls the engine’s cooling fans. Ferrell is a certified automation and control technician from the Advanced Technology Center in El Paso, Texas. Now you should read zero resistance. The reason being, on most vehicles, is that the cooling fan doubles as a condenser fan. 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. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. 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. 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. 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. His work has appeared in Texas, New Mexico and Miami and on various websites. The main purpose of Antifreeze Coolant in your engine is to remove heat. 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. Faulty wiring could be to blame. If resistance is high, the coil may still be working but it is failing; or it may not work when electrical loads are high. If the coil has no resistance, it is open and has failed. If there’s an issue with the relay, the fan will be affected. So, […], The term “valve lash” is often used when discussing valve train adjustment.