Disconnect power at the service switch. Check the connection on switch and wire wires leading up to it. The cooling on off is controlled from the ground side by the radiator core temp switch. Step 4 - Finally, the fourth set of wires, Conclusion, Configure the radiator fan wires, If your fan motor is a 120V, it will most likely have four colored wires (black, blue, red, yellow, etc. The relay then closes its contacts, feeding full voltage to the fan, because a relay can handle the current better than the fan switch. Before going on to the next step, let's divert here for a second: Search: Radiator Fan Switch Test. [5] The cold water will serve as a reference measurement for your sensor. I tried testing the fan speeds by jumping pins 87 and 30 for each final relay. 3. If you don't see 12 volts at the connectors, the fan isn't getting power from the relay. If you jump the green and tan wire on the High Pressure Switch Plug, the fan will run. 2. 1. First, connect one probe's wire to the battery's (-) terminal. If done correctly, your rear passenger side windows will raise and lower 2 times, and your power windows will be reset.5. Place your multimeter in Ohms mode. To test a 3-wire crankshaft sensor with a multimeter, follow these steps: 1. Turn the air conditioning to the maximum setting - this should spark the cooling fan to immediately come on. Fan should start spinning on high speed within 30 secs - If not shut car OFF to avoid overheat. 3, Connect the black multimeter test lead to the battery negative (-) access point (located on the driver side strut tower). This video from Sears PartsDirect shows you how use a multimeter to check continuity on wires and electrical parts using a multimeter. Check the windings. Testing The Normally Open (NO) Terminal of The Relay Set the switch to read current measurement and the set the range. 1) Set your multimeter to the "Ohms" setting. So, the engine coolant temperature (ECT) sensor is designed to be; fully submerged in coolant. Also, engine coolant prevents the water from boiling. The electric fan is turned on by a temperature switch (#13 in the attached diagram). We then tapped the switch sever times . Plug the probes into the ports on the multimeter. Kept the meter on the switch till the radiator got hot. Also, the #1 and #2 terminals in the fuse block can be shorted together (with the relay removed), which should kick the fan on. 5, Write down the resistance value your multimeter registers. Start car (preferably not while engine coolant is too HOT i.e. If the switch is off, you should see a reading of infinity (or some very high number). First, note that the relay has four terminals: two control terminals and two power terminals. You need to disconnect the jumper and energize the relay. Make sure you're measuring single ohms, and not mega-ohms. Next, flip the light switch to the "ON" position. ELECTRIC ENGINE COOLING FAN AND RELAY. For this test go to: TEST 2: Using A Jumper Wire To Bypass The Blower Switch. When it gets hot enough for high speed, there will be continuity between pins 2 and 3. Your next step is to bypass the blower resistor using a simple jumper wire. Relay 09 will run the fan at medium speed. In addition, most furnaces also have a fan limit switch, and its purpose is to prevent the blower from blowing cold air into the . 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. That switch is on the reciever/drier. The . The multimeter will now beep, indicating that there's continuity. Unplug the lower rad hose coolant temp sensor. During a bench test, the service technician will apply 120-volts to the evaporator fan motor, to see whether it runs or not. FAN NO. Replace it and you are back on the road. It doesn't have any switch. 135,845 views Jan 25, 2021 This is a short video on how to locate, remove and test the radiator cooling fan switch on your vehicle. Touch the two leads together from the meter, and you should get a reading close to zero. 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. 6, If one fuse terminal has a voltage and the other does not, it means the fusible element has melted. Look at the front of the engine block in the middle of the pulleys. Take a clean cup and fill it with about 6 fluid ounces (180 mL) of clean water and add few ice cubes to bring down the temperature. The readings of a good motor should not be more than 0.5 Ohms. First, remove the thermocouple. If the resistance is infinite, then the sensor is bad and needs to be replaced. Set the multimeter to continuity. Typically, the switch output voltage is sent to the fan when coolant temps exceed a certain temperature. Double check that your leads are in the right place to test for Ohms, and get the switch. This could be the fan resistor. 2) Place the probes on either side of the light switch. With volt meter we checked the switch to be open. Using your multimeter, test the resistance between the motor frame and the earth. V. Using a Special Relay Tester Another way to test your fuel pump relay is with a relay tester. Then a 20 AMP fuse for the radio and a 10 AMP fuse marked ST. 2 I think is a green. A coolant temperature switch activates the fan motors. To check your fuse, you need to switch on a broken circuit. The 2012 and up Jeep JK wrangler fan on the 3.6L Pentastar has a few key characteristics: It is an Outrunner motor design. Unplug the cooling fan. 3) Flip the switch and observe the reading on the multimeter. 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 . That's why, you will need to test it. That is tru but only if the temp light is coming on. The black multimeter probe will go to the negative battery terminal (for under-hood fuses) or a . Step 1 - Check the fan switch relay. Unplug the sensor electrical connector. You can do this test with the fan installed in the car or outside the car IT DOES NOT . The color scheme for the third band is as follows: Black = 1, Brown = 10, Red = 100, Orange = 1000 (or 1 K). These fans are programmed to trigger at a higher than normal temp and many people think there is a problem when there really isn't. Was this. If it does, the temp sensor is the problem. Next, check the windings of the fan motor for an open or a short. Check the wires going to the radiator fan from the controller or relay. If it is blown, replacing the fuse will only solve the problem for a very limited period of time. Take off the test light and set your multimeter to read DC. It's usually near the radiator. It is a 2 speed fan system that uses 3 relays to operate. 3. Make sure to first check if it is compatible with your car. The fan continues to run until the temperature drops enough for the thermo switch to open, and then the fan shuts down Discord Streaming I tested the "Cooling Fan Timer Unit" pinouts as described as well as the Diodes test, all seems to be functioning properly at this time Measure if a bigger fan(s) will fit the back of your fridge, the . Press both front door lock buttons simultaneously for at least 3 seconds. Always ensure you set the maximum range because it will prevent overloading your meter or cause any other damages. I am providing below, the step by step guide to test the NC terminal. Once the combustion process begins (you will know this by the start-up of the draft inducer . EXPERT. Close the bleed screw once coolant exits through it. ), as well as a white wire, a black wire, and two brown wires. from driver: A/C MGN, FAN NO. Reason #2: Fan resistor not working While it's unlikely that your entire fan needs to be replaced, sometimes just one component isn't working correctly. This is the number you'll multiply the first two bands by to get the resistor's value. Top off the cooling system at the radiator and overflow tank. Remove the fan motor connector, Identify the terminals that supply current to the motor, Set the multimeter to read volts by moving the rotary switch, Connect the multimeter probes to the terminals on the connector, Check the multimeter. To test the evaporator fan motor of a refrigerator I know you can just test the resistance of the fan motor. Finally, with the fan switch on the highest speed, the fan motor is receiving system voltage (14.5 with the engine running). Loosen the bleed screw at the upper radiator hose and start the engine with the heat on max high. I removed the limit switch and used a jumper to keep the furnace running while using a meat thermometer to check temperature in the port. If necessary, a replacement relay costs around $20. Broken Wiring or Bad connection. Use a multimeter to check for power at the unplugged fan connectors. To test the switch you should know what that temperature is and be able to monitor it. Both cooling fans should run in fast speed. Step 4: Test the A/C. (I think I also had to jumper relay 03, speed control.) . Then, proceed to put the leads from your meter on the screws on the side of the switch. 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. How to test your radiator fan with 12 volts directly from the battery. Apr 22, 2009. A mutlimeter can help you detect a break by testing whether electrical current is traveling through a wire. The radiator fan switch relay may not be supplying power to the fan. 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 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 . 4. They will run that motor through its paces and figure out the best way to move forward. If it doesn't, the fan is the culprit. Test the fan for continuity using a multitester. 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. Important Tips And Suggestions. Remove the suspect relay and install the good relay and check if your engine fires up. Identify the terminals and pins on the relay that are part of the control and power circuits. But, will not function correctly, if the coolant level is low. Testing A Car Radiator Fan Relay Using A Digital Multimeter, First, you need to remove the car radiator fan relay from the fuse box. We started chasing down the wires to the fan then found the relay on the radiator. Unplug the electrical connectors to the radiator fans. The wiring harness itself can go bad. But, If It Is Working, Move On To The Next Step. Pull the latch for the hood and open it, making sure it is secure before letting go. 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 Refer to the top or side of the relay to. 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). Some systems will energize a relay when the switch is set at the highest fan speed. FrankC. If you need to confirm if it's in working order or not, you should turn on your engine and let your vehicle idle. Set the multimeter's meter to '20' in the DCV section as you will be testing 12V circuits. 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). How do you test a radiator using a multimeter? To do this, you'll have to measure the ohms. Then connect them directly, from the battery to the fan motor, to see if it spins. HOW TO TEST FAN MODULE CONTROL BOX ? In older cars, this typically takes about 15-20 minutes for the engine to reach the right temperature. Motor size varies with each engine option. 1. Check the car radiator fan relay to ensure that it does not have any damaged terminals or wires. When the temperature gets high enough to activate the low speed, there will be continuity between pins 1 and 2. Here's how to test a radiator fan relay. Unless the wiring issue is fixed, the fuse will blow again. If the radiator fan does not work even though your car is overheating, there may be wiring issues or a bad connection. Next, test the resistance of the switch. 1 is on the right side of the radiator. Secondly, turn on the meter and set it to Ohms. Relay 10 should run the fan at low speed, but nothing happens. Otherwise, the problem lies somewhere else. The fan is a 3 wire design, which you can see if you detach the harness. That might tell you if it's a bad relay, bad fuse, broken wiring, corroded harness, etc. The diagram on the relay box shows I block empty. And, it also lubricates the engine block and the radiator, preventing rust formation. Repeat this action with the second contact pad. Testing power supply 230V or 208V is the expected voltage levels of a single-phase motor. Unless the wiring issue is fixed, the fuse will blow again. Look for replacement thermostats and install them yourself! Finally, always use the right mix, of water and . 2. FAN NO. Electric motors drive the cooling fans. This reading should show the same as your battery's voltage, typically 12V. The first thing that you would want to do is locate the fuse for your Vue's radiator fan and make sure that it hasn't blown. , use a multimeter either high or low current ranges be reset.5 refer the Inch ) cooling fans to turn once the combustion process begins ( you will know this the! 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