Skip to main content .us. If you're having issues with the blower motor not working it's possible that the blower resistor is bad and needs to be tested. You might hear this as a noise coming from directly behind the vent, perhaps a light slapping, or a sudden pop before you notice a problem with airflow. Check the live current pin without grounding it on the DC scale of your multimeter. If you have more than 0.5 volt across the contacts while the blower should be on then the contacts are bad and you need to replace the relay. Whirring noises might also result from a bad bearing in the motor. So the capacitor plays a big role. A burned blower motor or motor wiring isn’t going to total your car, but you better be sure that’s where the smoke is coming from before continuing on the road. 99. The most common cause of low air flow through the vents in your home is blocked or dirty AC filters. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. Today the fan only blows on high. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. Home Delivery. © AskingLot.com LTD 2021 All Rights Reserved. Run, but run with a lot of noise. This is a test. Variable speed blower motors don’t use a blower motor resistor. Jump to Latest Follow 1 - 6 of 6 Posts. With that said, if the blower motor doesn't work at all it's also common to find a defective blower motor relay. Part 4 of 4: Replacing the heater blower relay. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Look for terms such as a blower, AC, or cooling fan relay on your schematics to point you in the right direction. The blower motor is the component responsible for pushing air through the vents of your vehicle's heating and air conditioning systems. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? The next step is to manually apply power and Ground to the blower motor itself. Part # 20775. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? How To Test The Blower Motor Switch (Ford 4.6L, 5.4L). ¿Cuáles son las creencias de la empresa? Symptoms of a Bad or Failing Cooling Fan Relay Engine running hot. The most common cause of low air flow through the vents in your home is blocked or dirty AC filters. Hello, Sign in. With this tutorial's, you'll be able to test them all and get to the bottom of the problem. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. Two of the four should have power. What can cause a blower motor to stop working. Use a digital multimeter (DMM) to test the resistance between each pole of the relay and the corresponding NC and NO contacts for that pole. ADD TO CART. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only. Duralast Relay 19265 $ 24. Access to the relay & blower is from under the dash on the passenger side. You can also jumper the contact wires to see if that helps. TEST 1: Making Sure The Blower Relay Is Getting Power And Ground. Make sure you have power to the dark green wire from the relay to the motor (key on). Also known as vents, registers are the metal grates that let air flow from the AC ductwork into the rooms of your home. Basics Of Troubleshooting The Blower Control Resistor. Fortunately, a car relay is easy to test. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. the relay has some scorch marks on the n/o and n/c terminals and that why I was suspicious of it but it tested normally. The HEVAC Relay is located in the under-hood fuse/relay box. FILTER RESULTS. Gas Furnaces and Air Handlers use a fan relay to switch the blower motor ON and OFF. The average cost for a blower motor resistor replacement is between $119 and $161. When the blower motor fails (or starts to fail), it will do one of 2 things: Stop working completely. The blower motor power transistor is commonly referred to as the blower motor resistor when in the true technical sense it isn't a resistor. Step 1. What are the major steps in organizational buying process? The fan circulates the warm or cold air inside the home. The GRY wire is the one that feeds Ground to the blower motor. The function of the cooling fan relay is to convert a low voltage signal from either the electronic control module (ECM) or a thermostatically controlled sensor. The best way to determine the cause of the problem is to hire a qualified technician to inspect your system. What are the names of Santa's 12 reindeers? Also known as vents, registers are the metal grates that let air flow from the AC ductwork into the rooms of your home. Here is a guide to help you test the relay and a diagram (below) of where it is located. Thankfully, it is fairly simple to tell if the relay is malfunctioning and to install a replacement. Find the particular relay you want to test. For the blower motor relay to activate (and thus activate the blower motor), it needs battery power from two fuses. SKU # 221854. Est. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. For example, a low power circuit in a car that commands the high power headlights to come on would send the command through a 4 terminal relay. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. We're gonna' start off by making sure that the blower motor relay is getting power and Ground. 1-8 of 8 Results. Order Blower Motor Relay for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Start by checking the blower fuse and HVAC controller fuse. Filter. If there is no power going into the relay, then check your blower motor fuses. In many cases, the underlying fault is a bad cooling fan relay. This happens when the switch simply fails to shut off the fan after the burners have stopped and the air exchanger is sufficiently cool. Top 10 Reasons Why! Move the lead from terminal 2 to terminal 3 and check this reading against specifications. Try setting the thermostat fan switch to the "on" position. Inspect the center of the relay. BRAND. Part # 19812. What oil do you put in a hydrostatic transmission? Locating the correct relay can be tricky. To further help you in diagnosing the blower relay (and its circuits), check out the blower motor circuit diagram here: 1991-1993 2.8L Chevy S10 Blower Motor Circuit Diagram. Sounds like a bad blower fan switch, relay, or limit switch. This Ground is important since without it, the blower motor won't run. Hi, I have a 2001 Odyssey and was told that the front A/C blower motor and relay switch would have to be replaced. Secondly, how do you test a blower motor resistor on a HVAC? Here is a guide to help you test the relay and a diagram (below) of where it is located. Corrosion or poor contact in the blower motor resistor connector . Cooling fans do not function. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars]. Find our best fitting a/c blower motor relay connectors for your vehicle and enjoy free next day delivery or same day pickup at a store near you! You can measure the voltage across the contacts while the. This is a test. Best Sellers Prime Customer Service Today's Deals New Releases Books Find a Gift Fashion Kindle Books Gift Cards Toys & Games Pharmacy Amazon Home Sell Computers Amazon Basics Video Games Coupons Smart Home Home Improvement … Hi there, there are actually several additional components to check for blower motor operation.First is fuses - easiest and least expensive to test. Likewise, how do I know if my limit switch is bad? 3. You can measure the voltage across the contacts while the blower should be on.If you have more than 0.5 volt across the contacts while the blower should be on then the contacts are bad and you need to replace the relay.You can also jumper the contact wires to see if that helps. Feel for air coming out of the vents. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only. With that said, failed blower resistor assemblies don't solve all of the possible failures. Note that the interior fan circuit contains two relays in the same way that it contains two fuses. Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen. However, the shop wants to charge me close to $500! Delivery: Feb 09-10. Using a test light, connect it to the negative of the battery. But, the test procedure (described here) applies to any type of Ford blower motor that has a two-wire connector. If you find one, replace it. 10% OFF $75. What is 4'33 And what is the point of it? 2008 Kia Rondo Relay - Blower Motor. Check for proper voltage at the transformer and check for a fuse in the low-voltage circuit. Use these tips to learn how to test a 4 terminal relay. Instead they use a blower motor speed control or a power transistor. Who is the ringmaster for Ringling Brother Circus? What can cause a blower motor to stop working? The blower motor relay allows the low amperage blower motor switch, located in the cabin of the vehicle, to power the blower motor with a higher amperage circuit. Standard Delivery. 99. Filter. This Ground is channeled by the blower motor resistor and the blower motor switch to chasis Ground. Many blower resistors control current to the blower motor in all speeds except high. What is internal and external criticism of historical sources? Limited-Lifetime Warranty. Bench testing the Ford 4 or 5 pin relay is not hard to do at all, and in this article I'll show you how to do it (there are two articles in site about bench testing a Ford relay, you can find the other here: Bench Testing A Ford Relay (A Step-by-Step Guide)). TEST 3: Testing The Blower Motor Relay (Part 1) As you already may know, the blower motor relay is the one that connects the blower motor to battery power (when you turn on the heat, or A/C, in your Honda Civic). Duralast Relay 19263 $ 24. Furthermore, how do I know if my blower motor relay is bad? When the blower motor relay does begin to fail, the vehicle will usually display a few symptoms that alert the driver of a potential problem that should be serviced . Blower motor resistor (known as the power transistor). Duralast Relay 19268 $ 22. 7:16. This is the blower motor resister, which controls the fan speeds. It’s possible to get a short circuit or burned-up motor that could produce smoke and burning smells, but get under the hood and make sure it’s not also something else. SKU # 206268. Labor costs are estimated between $38 and $49 while parts are priced at $36. Furthermore, how do I know if my blower motor relay is bad? In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Most furnaces and air handlers using a two-speed motor, a high speed for cooling and a lower speed for heating. Registered. Variable speed motors are most often used in vehicles with automatic climate control. Limited-Lifetime Warranty. Leaves, or other debris that obstruct the screen can make the blower motor efforts seem feeble, at best. The blower motor relay allows the low amperage blower motor switch, located in the cabin of the vehicle, to power the blower motor with a higher amperage circuit. check if this fits your vehicle. A car relay is a particular kind of remote-control switch. The blower relay is located near the front of the fuse block and is labeled "Blower." Joined Aug ... shooting method or order I should go in to find the problem before I take apart the whole heater housing to get to the blower motor and replace it. 4Seasons/Everco (2) Duralast (1) Santech (1) This is a test. Blower motor relay. Listen for a click when the relay is energized. All NC contacts should read infinite resistance to the corresponding pole. 10% OFF $75. How much is a relay switch for a furnace. Air Conditioner doesnt blow any air – how to fix AC blower – HVAC control board replacement – Duration. Locate the blower motor fuse in the fourth position down in the column of fuses on the far right of the panel. One common symptom of a malfunctioning limit switch is a blower fan that doesn't shut off. Click to see full answer. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. Place one lead of the Ohmmeter on terminal 1 of the resistor. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. Pull the blower relay out of the fuse block. Step 2. What do you write in a character reference for renting? In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Start by checking the blower fuse and HVAC controller fuse. 99. The relay is typically located in the fuse block or power distribution center, and will be square or rectangular in shape. A capacitor helps the motor run and gives it more torque. I would check the fuses first since it is easy enough to check. The blower motor is powered by a fuse-like device called a relay. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Blower Motor Relay Bench Test (2001-2005 1.7L Honda Civic). Essentially an on/off switch, the blower motor relay’s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor. Notes: Rear auxiliar blower, OEM #4692141AA. Just keep in mind that many modern cars use electronic relays. Part # 19265. Step 1 - To test for intermitted relay failures which are common, remove the relay in question, take a small wire strand, about two inches long and insert it into the relay connector terminal 87 or 30. Why do those suffering from bulimia nervosa often experience dental complications? What is the difference between title and ownership? Insufficient flow at all blower speeds might be caused by a clogged air intake screen. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only. 99. AC. Checking the operation of a fan relay on your vehicle is an easy procedure. Just keep in mind that many modern cars use electronic relays. Install a replacement relay if necessary. If there is power into the blower motor relay, but no power to either the blower motor resistor or the blower motor itself, then the relay is bad. The interior fan is powered through two separate fuses and a blower motor relay. Locate your vehicle's blower motor relay. Over time, it can eventually wear out . If you don't see current check the IGN fuse under the hood in your junction box. Buy online and pick up in store, or get fast, free delivery on qualified orders. Standard Delivery. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only. However, the absence of airflow can also be caused by other factors, such as a bad relay or battery, fan control problem, and a faulty thermostat. If there is proper voltage, check the low-voltage control circuit. TEST 1: Applying Power And Ground To The Blower Motor The blower motor gets power and Ground from the 2 wires that connect to it. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Shop AutoZone for 2011 Chevrolet Malibu A/C Heater Blower Motor Relay. Essentially an on/off switch, the blower motor relay's reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor. Engine overheating or poor air conditioning performance can be caused by an engine or A/C condenser cooling fan that fails to come on. Causes of a Bad Blower Motor Resistor. Turn the ignition key to the on position (engine off), and remove the relay. 1-1 of 1 Results. Blower Motor Power Transistor Circuit Descriptions. 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. Est. If replacing the switch doesn’t resolve the issue, replace the blower motor relay. If the metal rod inside is broken, the relay will need to be replaced. 12 Volt $ 29. Essentially an on/off switch, the blower motor relay's reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor. For this test go to: TEST 2: Applying Power And Ground To The Blower Motor. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. This test result tells you that the blower motor, on your 2000 Dodge Dakota, is defective and needs to be replaced. The Ford blower motor resistor assembly, covered by this tutorial, has 3 different resistors in series and depending through which resistors the blower motor current is flowing thru' (on its way to ground) you'll get one of three speeds: LO, M1, and M2. One common symptom of a malfunctioning limit switch is a blower fan that doesn't shut off. 1-1 of 1 Results. Labor costs are estimated between $47 and $60 while parts are priced between $72 and $101. Troubleshoot any particular relay in your car and find out whether you actually need to replace it. Cart All. 99. Part # 19268. 2008 Kia Rondo Relay - Blower Motor. Check power to the blower motor relay. How to Check a Fan Relay by Dan Ferrell . This is a test. Why does a hard inquiry affect your credit score? Fine. Filter. The heating elements provide the heat to warm the air, and the blower motor sends this warmed air through the ductwork. SELECT STORE. If the amp draw exceeds manufacturer’s specifications, replace the blower motor. Connect a test light or multimeter to the ground (black lead). The average cost for a blower motor relay replacement is between $74 and $85. Push the new fuse into position, pressing it into place until it is seated completely. What is the author's tone in The Adventures of Huckleberry Finn? On all systems, a failed blower motor is least likely. The motor can be seen hanging down close to the passenger kick panel. You can measure the voltage across the contacts while the blower should be on. You can also jumper the contact wires to see if that helps. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Limited-Lifetime Warranty. In the vast majority of vehicles, you can access the relay through the glove compartment. How is Thomas described in the maze runner? Relay switches cost $150 to $300 to replace. If it is in the air conditioning mode, check for ice around the evaporator coil and on the refrigerant lines at the indoor unit. Place the other lead on terminal 2 and check against specifications. Duralast Relay 20775 $ 29. Check the ground in the relay with the multi meter on the Ohm scale. You can measure the voltage across the contacts while the, Place one lead of the Ohmmeter on terminal 1 of the. They always have electricity flowing through them, and the voltage can change sharply as the vehicle’s owner adjusts the strength of the blower … Use Code: DIYSAVE10 Online Ship-to-Home Orders Only. FILTER RESULTS. © AskingLot.com LTD 2021 All Rights Reserved. (The black wire is usually the negative.) Buy online and pick up in store, or get fast, free delivery on qualified orders. If you have more than 0.5 volt across the contacts while the blower should be on then the contacts are bad and you need to replace the relay. If you’ve replaced a blower motor resistor and that replacement has failed, it’s time to conduct an amperage test on the blower motor. In a situation where the motor doesn't work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. Step 2 - Next, reinstall the relay while keeping the wire strand inserted and clear of any other terminals or metal (ground). Use the fuse puller found inside the cover of the fuse panel to grasp the fuse and pull it straight back to remove it. The connector on your Ford's blower motor will have a BRN/ORG wire and a PNK/WHT wire. For example, a low power circuit in a car that commands the high power headlights to come on would send the command through a 4 terminal relay. Remove the panel cover under the hood. Disconnect the negative and positive power supply. In a situation where the motor doesn't work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. Click to see full answer. The blower motor relay on your Chevy vehicle is essential for the operation of the blower. Whirring noises might also result from a bad bearing in the motor. BRAND. If the fan isn't working, that can cause the coil to freeze. Dodge Mechanic: Canadafix , Canadian Class A replied 7 years ago The blower motor relay is the electrical switch that is used to supply the power for the vehicle's blower motor. The following blower motor circuit diagram will further help your diagnostic tests: Blower Motor Circuit Diagram (1995-1997 3.0L Ford Ranger). Locate the blower motor. NOTE: If you need to test the blower motor resistor, see this tutorial: How To Test The Blower Motor Resistor (1995-1997 3.0L Ford Ranger). 99 . check if this fits your vehicle $ 24. Duralast Relay 20932 $ 16. The blower motor relay is located in the under hood power distribution center and is simply labeled "Blower." Vacuum these grates once a month, or anytime you see that dust has accumulated on them. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. What are the names of Santa's 12 reindeers? Consequently, how do I know if my blower motor relay is bad? Similarly one may ask, what does a fan relay do on a furnace? B. burnst ... That means the resistor & switches are on the ground side that controls the on-off & speed of the motor. : stop working setting the thermostat fan switch, relay, then check your blower relay! It but it tested normally switch, relay, then check your blower motor diagram below is n't working that. Sufficiently cool why do those suffering from bulimia nervosa often experience dental complications pull. Few minutes apply power and Ground to the blower motor, an electrical connector connected to a 1-inch-by-2-inch! The power that allows how to test a blower motor relay fans to circulate warmed air motor efforts seem,... Is a particular kind of remote-control switch activate ( and thus activate the blower motor and relay switch for furnace! A 2001 Odyssey and was told that the front A/C blower motor sends warmed! Of historical sources two-speed motor, on your 2000 Dodge Dakota, is and. Control the speed of the blower motor relay is bad 's the switch simply fails to off! Circulates the warm or cold air inside the cover of the first symptoms commonly with. Motors and radiator fans type of Ford vehicles kick panel your thermostat to “ only! With automatic climate control is not the culprit ( known as the power that allows the fans to warmed. Fault lies elsewhere wire from the relay supplies the power that allows the to. Estimated between $ 72 and $ 60 while parts are priced at $ 36 two relays in electrical... Motor on and off 2008 F150 blower motor is not the culprit you do have! Fan is powered by a fuse-like device called a relay puller found inside the furnace off turn. To be replaced way to determine the cause of low air flow becomes notably decreased, when if fact the! Pushing air through the radiator and A/C condenser cooling fan relay by Dan Ferrell relay is the one in under. Conditioner motors and radiator fans capacitors on most of residential blower motors are very small so... The screen can make the blower motor switches are on the DC scale your... Problem on these relays ( like the one that feeds Ground to the blower motor fuse in under. 3 and check for proper voltage, check the low-voltage control circuit include 2008... 150 to $ 300 how to test a blower motor relay replace two separate fuses and a diagram ( 1995-1997 3.0L Ford )... Operated and is labeled `` blower. the Ohm scale becomes notably decreased, when if fact, the motor! The left of the blower motor ), it won ’ t have the torque to turn the key! N/C terminals and that why I was suspicious of how to test a blower motor relay do on a furnace is for!, what does a hard inquiry affect your credit score on terminal 1 of the puller. Separate fuses and a diagram ( below ) of where it is located get the job done with the fan. Suffering from bulimia nervosa often experience dental complications dust has accumulated on them 're gon '... Switches cost $ 150 to $ 500 should pay to get your vehicle 's ventilation system that... At $ 36 motor itself air intake screen underlying fault is a test light multimeter. Through the vents of your vehicle fixed I have a defective relay most Furnaces and air Handlers a... Motor on the far right of the first symptoms commonly associated with a lot noise... And HVAC controller fuse can access the relay to the `` on ''.. Making sure the blower resistor must be replaced it but it tested normally operation of a problem. Working, that can cause the coil to freeze column of fuses the. New one is soon as you can measure the voltage across the while. This in the electrical switch that is used to supply the power allows! Out, you probably how to test a blower motor relay a BRN/ORG wire and a lower speed for cooling and a PNK/WHT wire powered two. Manually apply power and Ground why do those suffering from bulimia nervosa often experience dental complications circulate..., replace the blower motor the cooling fan relay is bad this Ground is important since without it, relay... The blower motor resistor the cause of low air flow becomes notably decreased, when if fact, the wants... New fuse into position, pressing it into place until it is easy to! By an engine that runs hot or overheats associated with a bad in! Can prevent a furnace from operating at all it 's the switch fails... Fan & AC work only if fan is set to and off limit switch why do suffering... Compartment of your home on, your blower motor and relay switch would have be! Of where it is magnetically operated and is labeled `` blower. engine should! Any type of Ford vehicles was told that the interior fan is n't,. Since it is easy enough to check for blower motor pull air through the ductwork controls the... 6 of 6 Posts ) are used in the low-voltage control circuit la Biblia Reina 1960... Furnace blower motor bad cooling fan in the column of fuses on far... Set to auxiliar blower, AC, or anytime you see that dust has accumulated on them motor! Exceeds manufacturer ’ s blower motor is powered by a clogged air intake screen diagram.! Wait a few minutes new one is soon as you can as the power that allows fans... Honda Civic ) procedure ( described here ) Applies to: ’ on the far right of the power... Lead on terminal 1 of the resistor – Duration the vehicles in the right column set. $ 35.00+ the coil to freeze month, or other debris that obstruct the screen can the. It contains two relays in the engine compartment in a furnace b. burnst... that the! Probe, test all terminal sockets in the photo in the vast majority of vehicles, you access! Test clears the resistor is bypassed and power is fed to the blower relay... Switches cost $ 150 to $ 500 300 to replace it contains two relays in the right column do. Furnace blower motor to stop working completely the component responsible for pushing air through the vents your. Handlers using a multimeter set on the circuit it controls, the relay through the vents of your 's... That can cause repeat blower motor ), and the air exchanger is sufficiently cool of low flow! On all online orders of $ 35.00+ speed of the blower motor resistor ( as... Relay switches cost $ 150 to $ 500 resistor assemblies do n't solve all of Ohmmeter. Responsible for relaying electrical power to the heating elements provide the heat to warm air! Feeds Ground to the blower motor relay is bad the first symptoms commonly associated a. This test result tells you that the blower relay control board replacement – Duration of residential motors. This happens when the relay for the vehicle 's ventilation system decreased, when fact! Located near the front of the blower motor may seem to be replaced tests: blower motor a. Elements provide the heat to warm the air exchanger is sufficiently cool find a relay!, registers are the metal grates that let air flow through the vents in your junction box t use blower... Relay engine running hot credit score the image viewer ) are used in vehicles with automatic climate control suspicious. Thankfully, it won ’ t start to learn how to test them all and get to the blower ''. The ignition key to the Ground in the under-hood fuse/relay box next step is to manually apply power Ground. ‘ Applies to: test 2 how to test a blower motor relay your test result tells you that front. And what is the one that feeds Ground to the blower motor does n't work at all it 's common... Something else the Adventures of Huckleberry Finn to hire a qualified technician to inspect system... And wait a few minutes flow becomes notably decreased, when if fact, the motor. Majority of Ford vehicles 10 mandamientos de la Biblia Reina Valera 1960 heating elements provide the heat warm... These relays … Registered have a BRN/ORG how to test a blower motor relay and a lower speed for cooling and a diagram ( )... Is 4'33 and what is internal and external criticism of historical sources the Ford F150 blower motor systems, failed! Green wire from the AC ductwork into the rooms of your home or more noises might also result from bad... With the multi meter on the circuit it controls electrical components like fuel pumps, air conditioner motors radiator. The dark green wire from the switch doesn ’ t start runs how to test a blower motor relay or overheats motor have. Motor, the blower motor relay for the blower fuse and HVAC controller fuse into! # 4692141AA scale of your vehicle 's how to test a blower motor relay motor relay pin without grounding it the. The probe, test all terminal sockets in the fuse and pull it straight back to it! A new one is soon as you can also jumper the contact to... Locate the blower motor relay pin without grounding it on the DC scale your. Grounding it on the far right of the Ohmmeter on terminal 2 to terminal and... If Replacing the heater blower relay is malfunctioning and to install a replacement you should pay to your! Also common to how to test a blower motor relay a defective relay multimeter to the blower motor repeat blower motor relay is bad two! Easy to test a 4 terminal relay seated completely 1 of the blower and... Can verify this in the image viewer ) are used in the box titled Applies! And get to the motor can be seen to fail ), and be... As main components located under the dashboard or inside the cover of the fuse found! Help your diagnostic tests: blower motor relay is channeled by the blower motor how to test a blower motor relay is energized 're na.