Unless the wiring issue is fixed, the fuse will blow again. Relay 13 will run the fan at high speed. Check the fuses one by one. It utilizes the same coolant temp sensor that the computer uses for everything else. Step 4 - Finally, the fourth set of wires, Conclusion, Configure the radiator fan wires, The fan switch is the ECT (engine coolant temperature switch), that tells the ECM that the engine temperature is 199 and the ECM tells the fans to come on by grounding the relays. I used a multimeter to verify that it reads 24v when it trips. The 2012 and up Jeep JK wrangler fan on the 3.6L Pentastar has a few key characteristics: It is an Outrunner motor design. First, remove the thermocouple. Unless the wiring issue is fixed, the fuse will blow again. The fan is a 3 wire design, which you can see if you detach the harness. Look at the front of the engine block in the middle of the pulleys. The diagram on the relay box shows I block empty. It's usually near the radiator. Get the engine surface temperature using an infrared thermometer or suitable cooking thermometer. Set the multimeter's meter to '20' in the DCV section as you will be testing 12V circuits. If the AC clutch fails to energize then it would mean that you have a problem with power, ground, thermal protector switch, or the magnetic clutch. Make sure you're measuring single ohms, and not mega-ohms. During a bench test, the service technician will apply 120-volts to the evaporator fan motor, to see whether it runs or not. It is a 2 speed fan system that uses 3 relays to operate. In older cars, this typically takes about 15-20 minutes for the engine to reach the right temperature. Make up some jumper cables. This doesn't have much bearing on diagnosing problems, but it's a key difference from the more traditional fan designs in the earlier Jeep JKs. With this information, we can assume that the light switch in great shape. Replace it and you are back on the road. That is simply a test to check the meter for continuity. So, the engine coolant temperature (ECT) sensor is designed to be; fully submerged in coolant. ELECTRIC ENGINE COOLING FAN AND RELAY. Touch the two leads together from the meter, and you should get a reading close to zero. Refer to the top or side of the relay to. Set the multimeter's meter to '20' in the DCV section as you will be testing 12V circuits. TIP 1: This article focuses on testing the 2-wire cooling fan motors and the cooling fan motor relays of the 3.0L equipped Ford Escape and Mazda Tribute. Broken Wiring or Bad connection. Always ensure you set the maximum range because it will prevent overloading your meter or cause any other damages. Starting with the slender relay and fuse diagram. 4, Probe the male terminal labeled with the number 3 with the red multimeter test lead. Pull the latch for the hood and open it, making sure it is secure before letting go. When you turn the pressure switch around, you'll notice a side with different terminals. Here's how to test a radiator fan relay. Consequently, if it does not spin, it is blown. These motors are attached to the radiator. . 5, Write down the resistance value your multimeter registers. You need to disconnect the jumper and energize the relay. The first thing that you would want to do is locate the fuse for your Corolla's radiator fan and make sure that it hasn't blown. Step 1 - Check the fan switch relay. If it doesn't, the fan is the culprit. Remove the AC relay and in the relay socket, place a small jumper wire between pins 50 and 52 (check underneath the relay to identify the pins). Take the black multimeter standard test lead and touch the white wire with it. Electric motors drive the cooling fans. Your next step is to bypass the blower resistor using a simple jumper wire. Some systems will energize a relay when the switch is set at the highest fan speed. 2, Use a thermometer to make sure the water is 33 F (1 C). Relay 09 will run the fan at medium speed. Finally, with the fan switch on the highest speed, the fan motor is receiving system voltage (14.5 with the engine running). 4. That might tell you if it's a bad relay, bad fuse, broken wiring, corroded harness, etc. How do you test a radiator using a multimeter? 6, Apr 22, 2009. Repeat this action with the second contact pad. The cooling on off is controlled from the ground side by the radiator core temp switch. To do this, you'll have to measure the ohms. Also, engine coolant prevents the water from boiling. Cooling Fan, Unplug the fan connector, closest to the fan. Take the engine temperature on a location near the coolant temperature sensor. The coolant temperature sensor is located on the engine block under the hood. If necessary, a replacement relay costs around $20. Owner's manual Step 1 - Check the fan switch relay The radiator fan switch relay may not be supplying power to the fan. This will work on 92-00 Honda Civics.Switch: https://amzn.to/2WsWTXp above 95C) let idle 15 secs then turn on AC compressor. And, it also lubricates the engine block and the radiator, preventing rust formation. This is the number you'll multiply the first two bands by to get the resistor's value. The multimeter will now beep, indicating that there's continuity. Check the connection on switch and wire wires leading up to it. The wiring harness itself can go bad. Typically, the switch output voltage is sent to the fan when coolant temps exceed a certain temperature. There are three ways to check for a bad terminal. Kick off the engine or switch the ignition key off to IG2. Set the multimeter to the "ohm" setting. Make sure to first check if it is compatible with your car. Step 4: Test the A/C. Look for a pair of open ports on the bottom left and right corners of the multimeter. How to Test Radiator Fan with Multimeter, Locate the fan on your car. Check the connection plugs for signs of corrosion. With the leads apart, you will read infinity. The multimeter should be set for ohms, measuring resistance of the switch. 3) Flip the switch and observe the reading on the multimeter. Activation temperatures for the two fan speeds are as follows: Low speed on at about 92-97*C High speed on at about 99-105*C 2. For this test go to: TEST 2: Using A Jumper Wire To Bypass The Blower Switch. 1 is on the right side of the radiator. That's why, you will need to test it. But, If It Is Working, Move On To The Next Step. Take your multimeter and set it to ohms. (I think I also had to jumper relay 03, speed control.) . How to Use a Digital Multimeter, Table of Contents: Steps for testing the sensor, Step 1 - Locate the temperature sensor, Step 2 - Temperature sensor test, Step 3 - Check the reading values, Conclusion, Steps for testing the sensor, There are numerous ways that a damaged engine temperature sensor can affect the performance of your engine. The relay then closes its contacts, feeding full voltage to the fan, because a relay can handle the current better than the fan switch. The wiring harness itself can go bad. The fan motors on the 2.0L Escape and Tribute are 3-wire type fan motors and testing them requires a slightly different but significant approach not covered by . If it does, install a new relay. If there is no or low R134a in the system the compressor clutch will not come on. A successful test again demonstrates that the power supply to both cooling fans is good and that both fans, the AC relay, and the cooling fan relay are working properly. That switch is on the reciever/drier. Turn the power at the service switch back on. Close the bleed screw once coolant exits through it. If you don't see 12 volts at the connectors, the fan isn't getting power from the relay. This video from Sears PartsDirect shows you how use a multimeter to check continuity on wires and electrical parts using a multimeter. If the switch is off, you should see a reading of infinity (or some very high number). If the switch is on, you should see a reading of 0 ohms. The electric fan is turned on by a temperature switch (#13 in the attached diagram). 3. Testing A Car Radiator Fan Relay Using A Digital Multimeter, First, you need to remove the car radiator fan relay from the fuse box. Turn the air conditioning to the maximum setting - this should spark the cooling fan to immediately come on. The radiator fan is actually a 3 speed fan with factory air Diagnosing A Non Working Radiator Fan,Testing Fan Switch W/ A Soda Can, Water & Fire Honda Civic The fan continues to run until the temperature drops enough for the thermo switch to open, and then the fan shuts down With the engine off but the ignition on, unplug the connector to the . Use the positive lead to probe the connector terminals, you should be able to find system voltage (This can also help see if the computer system itself has power). This reading should show the same as your battery's voltage, typically 12V. If it is blown, replacing the fuse will only solve the problem for a very limited period of time. Remove the suspect relay and install the good relay and check if your engine fires up. 2) Place the probes on either side of the light switch. Loosen the bleed screw at the upper radiator hose and start the engine with the heat on max high. 1) Set your multimeter to the "Ohms" setting. Temperature. If you need to confirm if it's in working order or not, you should turn on your engine and let your vehicle idle. Cooling fan is not coming on with ac - blowing hot air!. Disconnect the two wires on the pressure switch and secure them so they do not short out on anything. Before going on to the next step, let's divert here for a second: First, note that the relay has four terminals: two control terminals and two power terminals. We then tapped the switch sever times . Look for replacement thermostats and install them yourself! This is good and is the correct and expected test result that tells you that the blower fan switch (in the A/C-Heater control panel) is OK. Unplug the cooling fan. FAN NO. Connect the leads on the switch pins. Relay 10 should run the fan at low speed, but nothing happens. A ScanGuage 2, which plugs into the OBD II port can monitor coolant temps and more that 12 other parameters. But, will not function correctly, if the coolant level is low. Fan should start spinning on high speed within 30 secs - If not shut car OFF to avoid overheat. Test the fan for continuity using a multitester. Then connect them directly, from the battery to the fan motor, to see if it spins. If you jump the green and tan wire on the High Pressure Switch Plug, the fan will run. We then hooked the fan to make it run and it cooled down quickly. Next, flip the light switch to the "ON" position. In addition, most furnaces also have a fan limit switch, and its purpose is to prevent the blower from blowing cold air into the . When the temperature gets high enough to activate the low speed, there will be continuity between pins 1 and 2. Kept the meter on the switch till the radiator got hot. Set the multimeter to continuity. 2. After you test. The . When it gets hot enough for high speed, there will be continuity between pins 2 and 3. If the radiator fan does not work even though your car is overheating, there may be wiring issues or a bad connection. All of your doors are now unlocked, and all power windows should function again. Check the car radiator fan relay to ensure that it does not have any damaged terminals or wires. V. Using a Special Relay Tester Another way to test your fuel pump relay is with a relay tester. How to test your radiator fan with 12 volts directly from the battery. Not sure if I'm making a mistake or not. If an appliances isn't working, a break in the wires may be to blame. There are three ways to check for a bad terminal. We started chasing down the wires to the fan then found the relay on the radiator. You can do this test with the fan installed in the car or outside the car IT DOES NOT . The readings of a good motor should not be more than 0.5 Ohms. Identify the terminals and pins on the relay that are part of the control and power circuits. 7/25/2011. Connect the probes in the right socket since there could be various connections for either high or low current ranges. That is tru but only if the temp light is coming on. Put the multimeter in the ohmmeter setting Place one of the multimeter probes on the NC terminal and the other on the COM terminal Read the resistance If the resistance value is around 0 , the NC terminal is working fine. With the ignition switch ON, turn on the air conditioning switch. Then there are 3 spots for the relays. Finally, NOW TURN THE METER TO VOLTS. Turn the key on and ready the voltmeter ( how to use a voltmeter ). Using your multimeter, test the resistance between the motor frame and the earth. These vehicles use 2,360 mm (14.2 inch) cooling fans to aid air flow through the radiator. Then, touch one contact pad of the fuse with the second probe's wire. If the resistance is infinite, then the sensor is bad and needs to be replaced. Start car (preferably not while engine coolant is too HOT i.e. 3. If your fan motor is a 120V, it will most likely have four colored wires (black, blue, red, yellow, etc. When the AC high pressure reaches a certain point, the Radiator fan switches to medium The fan continues to run until the temperature drops enough for the thermo switch to open, and then the fan shuts down The cooling fan on my '12 Eco won't run Thermoswitch checking switching temperature So I wired up pin 14 on the ccrm with a switch and I can get the low fan . If done correctly, your rear passenger side windows will raise and lower 2 times, and your power windows will be reset.5. It never opened or closed as the case may be. 2000 Jeep Cherokee Sport 4.0L Electric cooling fan doesn't come on with A/C We replaced the High Pressure Switch and Fan Relay. 3. First, note that the relay has four terminals: two control terminals and two power terminals. They will run that motor through its paces and figure out the best way to move forward. Connect one lead of the multimeter to one of the three wires on the sensor, and the other lead of the multimeter to the other wire on the sensor. Any Car If your car is overheating and the radiator fan is not working in this video we will explain how to test your radiator fan and know for sure if the fan is working or not. So in order to how to check if radiator fan is working, you have to check the voltage of a few fuses in the under-dash fuse box (number 3, 15, and 20) and under-hood fuse box (number 47 and 50). Place your multimeter in Ohms mode. Even if it runs, it could generate a noise that is unusually loud. Burning gas in a furnace always introduces the potential for overheating, so to prevent a catastrophe, every furnace has a high limit switch that shuts off the gas if the temperature inside the plenum, which is just above the heat exchanger, exceeds a preset value. On MAX high tried testing the fan at medium speed relay costs around $ 20 plugs into OBD! 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