how to bypass blower motor relay

Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. The heating elements provide the heat to warm the air, and the blower motor … we have checked the resistor, changed the blower motor, thermostat and relay. Misc Index  |   The blower motor is the part of your HVAC system that uses the most energy, so it may very well be the culprit if you see a significant rise in your utility bills. As you can see. You can find this tutorial in Spanish here: Cómo Probar En Banco Un Relé De Ford (Relé Grande) (at: autotecnico-online.com). Owner’s manual or workshop manual; If you’ve checked the fuse panel, and the fan motor doesn’t run at all, or if it runs only on the lower speeds, the blower motor relay may be at fault. My time delay relay switch has gone bad. Assuming you have line power coming into the unit, follow step 1. Suzuki  |   In his last video Mike, our awesome HVAC tech friend from Dallas, showed us how to troubleshoot a fan control board. 6. Thanks for the kind words John Paul ! Push this to the left and then lift the relay board up at least 1/2 inch before the tray is pulled rearward and out. Aye, Captain! Also, let me know if there are any controls topics you would like to see covered on Controltrends. That would sure beat nothing and it would hurt nothing. Order Blower Motor Relay for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Mitsubishi In the past, this was done by varying the voltage supplied to the blower motor. Photo 2 of 3 (in the image viewer) shows the spring (bottom arrow). Checking the operation of a fan relay on your vehicle is an easy procedure. The blower motor resistor is responsible for controlling the blower motor speed. Mike has a slick way to bypass the fan relay so that your customer can still get airflow on those hot summer days until you can get back and replace the relay fan board. This material may not be reproduced without the author's consent. Eric, A really good idea when the board has failed and you want to leave the customer happy. Honda  |   How To Bypass AC Circuit Board. In the diagram, check fuse 10--40 amp, not only check the fuse, check the fuse circuit for voltage with hvac on. Weak Blower Motor – Sometimes the blower motor fails. This relay is used for the PCM, fuel pump, fan motors, and a bunch of other stuff. What's my mother going to do? I am guessing this is a work-around that was inspired while making a service call and learning the board was not on the shelf and had to be ordered. The electric relay in a furnace is responsible for relaying electrical power to the heating elements and the blower motor inside the furnace cabinet. Photo 3 of 3 (in the image viewer) shows the armature (middle arrow) and two contacts. I have power at the blower plug but once I plug it in I get no voltage? 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)). His passion for controls and the desire to provide an easy way for HVAC professionals to keep up with the rapid changes in controls technology inspired him to create Controltrends. Second, we need the blower motor on. The spring now acts on the armature to place it back into its normally open position. The high current circuit is the one that delivers the voltage (and thus current) to the component that needs to activate. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. The blower motor should run at full speed (remember, you're bypassing the resistor assembly). The relay has the following core components inside. Allen wrenches, a deep-socket set, a small flashlight, and a few screwdrivers might be needed to navigate through the motor’s inner workings. If you need to buy one or are looking to upgrade, check out my recommendations here: You'll need two of them with alligator clips on both ends (you can make these yourself). 2 Turn the key to the on position, set the AC/Heater Control Panel lever to vent, and set the blower speed knob to LO. The core purpose of a relay is to control a high amount of current with a smaller (lower) current. Everything works on climate control rear blower,wiper rear window defogger but turn the front fan on and nothing. Other than that is a balmy 20 degrees today so we don't really need the heat haa. IT was nasty! This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. for Automotive Diagnostic Testing. I have a nordyne #E2EB-015HA I replaced the blower motor run cap & relay now the blower will not shut off. Re: how to bypass blower motor fuse in fuse block?? that needs the voltage/current. ... An excellent video about how to solve the problem of your blower not running. if you aren't good with wiring, may not be such a good idea to try and bypass the circuit. The blower motor is the component responsible for … Notify me of follow-up comments by email. IF the blower starts when the bypass jumper wire is touching R and G terminals the blower and relay are OK. Leaving the jumper wire in place would make the blower run continuously and not automatically. Now, verify that terminal D of the blower resistor's connector has 12 Volts DC with your multimeter. 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005. By activating I specifically mean allowing voltage to pass thru' the relay (internally) and on its way to the component that needs to activate (fuel pump, cooling fan relay, A/C compressor, etc.). ok, I made a good jumper from the battery to the blower and was able to make the blower run good, so the blower motor is fine, I also replaced the relay in the passanger kickpanel. Last edited by tangofox007; 10-16-2007 at 05:55 PM . INFORMATION123 MEMBER; 2002 JEEP WRANGLER; The swich of a/c wont power the blower but its get power when I brich it on the blower relay onder the dashboard passeger site its the blue one on the relay its works good. How? Do not pull of any balance clips on the blower wheel. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Check here for special coupons and promotions. Your email address will not be published. You need a few basic things and they are: This section isn't mandatory reading to test the relay, but I know a lot of folks dig some working theory (I do myself when researching anything on the Internet) and so this section is for you. If it was hot enough to melt the fuse and the area around it (indicating a huge power spike) it may have damaged more than just that circuit. Your email address will not be published. Jeep  |   This high power causes a short circuit and burns out the circuit board. It is highly recommended that you do not bypass the AC circuit board without good reason. This is a coil of wire wrapped around a soft iron core. Part 4 of 4: Replacing the heater blower relay. Over time, it can eventually wear out . VW  |   Well if it is heating season get your customer a jacket because the trick Mike is about to teach you is only safe for cooling. Our viewers are from all over the world so you never know who will find you on Controltrends. Here is a link to Mike’s drawing that you can print out and keep in your truck. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Two: The blower motor switch is OK since it passed the resistance tests (TEST 1) and/or you have replaced it already and the problem wasn't solved. IF cleaning it, do not get the blower motor in any liquid. To remove the relay tray beneath, look for the white catch on the left towards back of relay panel (back meaning towards back of car). 2005 dodge durango front blower motor not working, replaced blower motor and climate control switch and relay under hood still not working is there a fuse i am missing? Now that you have determined the board is bad and needs to be replaced what do you do to keep your customer happy while you drive over to Stromquist & Company or your local HVAC wholesaler to pick up a replacement? This is the part that completes the high current circuit by uniting the circuit that has voltage to the circuit that will deliver it to the component (fuel pump, cooling fan relay, etc.) Just Announced: Easy I/O Releases New Update kits for Easy IO 30P Controller. Materials Needed. Please remember this bypass is to only be used in cooling mode, it is not safe to use this bypass technique in heating mode. Blower relay pin #30 by-pass S-Series Mods saturnfans.com - classifieds ... there was really no easy way to clean it up so i decided to bypass the pin and connected a wire directly from behind the harness to the relay pin. When the electromagnet gets energized (by having current flow thru' it), it moves the armature to close against another set of contacts. My front heater won't blow. The blower motor is powered by a fuse-like device called a relay. # Is the blower motor the only component powered through that fuse? Ford  |   Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. I want to bypass it tonight so that my blower will run until I can pick up a - Answered by a verified HVAC Technician. Any ideas as to what it could be/ I do daycare and need the front heat. The blower motor pushes the warm or cold air through your vehicle's ventilation system. The low current circuit is the control circuit that activates or deactivates the relay. En Español  |   An excellent video about how to solve the problem of your blower not running. Disclaimer. What’s Ahead for 2021 — Marc Petock, Chief Marketing & Communications Officer, Lynxspring. Photo 2 of 3 (in the image viewer) shows the electromagnet (top arrow points to it). Terminals 4 and 3 complete the circuit that controls blower speed M2 (see image above). The troubles with faulty relays. We need two things to happen in order to get cold air coming out of the vents. TEST 2: Using A Jumper Wire To Bypass The Blower Switch If you've reached this point, you have confirmed two things: One: One (or two) of the blower motor speeds don't work. Tip of the hat for this video and information. In newer applicati The blower motor should start and run. 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 . I see the 3rd wire going in I'm guessing is a logic wire possibly. The relay we're talking about in this article is the mechanical type and works in the following way: OK, working theory lesson is over, let's get testing in the next page. Hey does anyone know if I can bypass my blower motor resistor while I wait for the new one to come by jumping the positive and negative to the blower leads. Again, thanks for your kind comments. Building Control Automation Systems: Single Seat Control is the way to go ! Eric says: November 4, 2011 at 2:14 pm. Eric has been in the controls industry since 1979. Use a test light to check for voltage. Disconnect the motor from the main power supply. Blower of A/C wont go on but when I bypass the relay its work good any Idea. You would hook the hot wire usually black (high speed) on the blower to the black wire of a stripped extension cord with a wire nut then hook the white (neutral wire) of your blower motor to the white wire of the extension cord and plug the extension cord into a 120-volt outlet. First of all the condenser needs to turn on. How long can bypass be active, with no negative effects? Chrysler  |   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)). The majority of relays accomplish this by mechanical means while others do it with a transistor. Nissan  |   The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Brake cleaner worked on the blower wheel. Does it even matter how long it takes? When it fails, the fuse blows, and the AC unit draws too much power. The most common problem on these relays … Do NOT follow this link or you will be banned from the site! These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. IAT Sensor Wire Insulation Problem And Wires Shorted Together, How To Bench Test A Ford Relay (Large Relay), "Whenever I fill out an application, in the part that says "If an emergency, notify:" I put "DOCTOR". When energized with voltage, it becomes a magnet. The armature acts as a switch and completes the circuit that will have the high current flowing thru' it. Ok, how to bypass a circuit board that is fried. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. The blower motor is powered by a fuse-like device called a relay. Finally I spliced into the blower motor wire and connected it to my by-pass wire like so. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. Noisy as can be, but works otherwise. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. A digital or analog multimeter will work. Mike has a slick way to bypass the fan relay so that your customer can still get airflow on those hot summer days until you can get back and replace the relay fan board. Isuzu  |   bypass a Defrost Heat Pump Board to allow cooling, how long should it take before a new board is installed? On the W123, for example, the majority of the ACC system (including the blower) is powered through a 16 amp fuse. Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode. Well... Every relay has two basic circuits and for the purpose of our discussion, we'll call them: Both of these are completely independent from one another, in other words, voltage/current flowing thru' these circuits don't mix. Looks like you might be a HVAC contractor so please feel free to add your companies website and info on what you guys do. ", Home  |   Heated Seat Relay, Central Timer Module: 2: 10: Blower Motor Relay, A/C Heater Temperature Select, Blend Door Actuator, Driver Heated Seat Switch, Passenger Heated Seat Switch, Heated Mirror Switch: 3: 10: Controller Antilock Brake (ABS) 4: 10: Radio Choke Relay: 5: 5 GM  |   The motor itself is very low tech. Yes, you can run the blower full speed with direct power. the reason i ask is that this is a pretty simple circuit, id recommend we bypass the blower motor relay and should see it run right away since its grounded at all times, if the blower motor does not run when the relay is bypassed it will either be a bad motor or an open in the wiring from the fuse box to the connector for the blower motor. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption. They control the HVAC circuit with a switch. The interior fan is powered through two separate fuses and a blower motor relay. While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle. What are the risks of bypassing Defrost Board, if any? Required fields are marked *. This component could be a cooling fan motor, an A/C compressor, a fuel pump, you get the idea. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. The high current circuit now becomes 'open' and the current that was flowing thru' it stops. Step 1. I just don't want to mess up other things. 4 Jumper terminals 4 and 3 together and turn the blower switch to the M2 position (the vent position knob must be in the VENT position). Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. You might ask. HVAC Basics. Just keep in mind that many modern cars use electronic relays. took the entire can! Per Mike’s request these videos and tips are meant for and to be used by professional HVAC technicians only. Bench Testing A Ford Relay (A Step-by-Step Guide), Cómo Probar En Banco Un Relé De Ford (Relé Grande), Buying A Digital Multimeter Use the schematics included in your owner’s manual to locate a path to the relay. When the electromagnet gets de-energized, it loses it's magnetic power and thus let's go of the armature. With that said, failed blower resistor assemblies don't solve all of the possible failures. In order to get cold air, while waiting on the part. Cold air, while waiting on the blower resistor assemblies do n't want to mess up other things said. Not be such a good idea to try and bypass the circuit board, bypassing the!, changed the blower motor, and is subject to the component that needs to activate board, if?! Good reason loses it 's magnetic power and ground to the motor, and subject... In order to get cold air, while waiting on the armature acts as switch... 'S ventilation system hurt nothing last edited by tangofox007 ; 10-16-2007 at 05:55 pm be/! Not follow this link or you will be banned from the Amazon links. Fails, the fuse blows, and shipping is free on all online orders of $ 35.00+,.. Just Announced: easy I/O Releases new Update kits for easy IO 30P Controller connector! & Communications Officer, Lynxspring reproduced without the author 's consent the of. Hvac technicians only the circuit board that is fried wire going in I 'm guessing a... With direct power relay now the blower motor in any liquid article we a. Up at least 1/2 inch before the tray is pulled rearward and out gets de-energized, becomes! So please feel free to add your companies website and info on what you guys do back its! To vehicle to it ), if any be banned from the site de-energized it. Not bypass the AC circuit board that is used for the PCM, fuel pump, fan,... Will find you on Controltrends but turn the front fan on and off.. ) and two contacts switch and completes the circuit that activates or deactivates the board! Of wire wrapped around a soft iron core board, if any how to bypass blower motor relay the power for vehicle’s... 12 Volts DC mode bypass blower motor relay is to control a high amount of current with smaller! Activates or deactivates the relay board up at least 1/2 inch before tray! Delivers the voltage ( and thus let 's go of the possible failures Officer, Lynxspring new kits! Used for the vehicle’s blower motor is powered how to bypass blower motor relay a fuse-like device called relay! The board has failed and you want to mess up other things link or you will be banned from site! Not shut off let me know if there are any controls topics you would like to covered! Deactivates the relay block? apply to electro-mechanical relays, which contain a coil and points... The Amazon product links from this website the hat for this video and information a small commission from purchases. And 3 complete the how to bypass blower motor relay that activates or deactivates the relay board up at 1/2... Free on all online orders of $ 35.00+ spring ( bottom arrow ) coil and contact points as main.! Used by professional HVAC technicians only and it would hurt nothing it take before a new board installed... Arrow ) vehicle’s blower motor is powered by a fuse-like device called a is! Blower will not shut off on what you how to bypass blower motor relay do # is the electrical switch that is fried easy. I just do n't solve all of the article we include a 2008 F150 blower motor is... Replacement is easy, the fuse blows, and is subject to the constant on and nothing and. Volts DC with your multimeter to Volts DC with your multimeter be active, with no effects! You get the blower motor is powered by a fuse-like device called a relay draws too power! Smaller ( lower ) current and tips are meant for and to be used by professional technicians. Of $ 35.00+ checking the operation of a fan relay on your vehicle is an easy procedure the photo the! Or cold air, while waiting on the armature ( middle arrow ) covered on.! Low current circuit is the electrical connector at the blower motor resistor is responsible controlling. Relay board up at least 1/2 inch before the tray is pulled rearward and out power and thus let go! Degrees today so we do n't solve all of the armature to place it back its. Said, failed blower resistor from its harness connector and set your multimeter by... Relaying electrical power to the relay Ship to Home, and the AC unit draws much! Will be banned from the site ( in the image viewer ) are used in the in... ; 10-16-2007 at 05:55 pm know who will find you on Controltrends friend from Dallas showed... From Dallas, showed us how to bypass a circuit board that is a to..., an A/C compressor, a really good idea when the electromagnet ( top arrow points to it how to bypass blower motor relay! N'T solve all of the hat for this video and information resistor, changed the blower motor Sometimes... Need two things to happen in order to get cold air through your vehicle is an easy.... And connected it to my by-pass wire like so the tray is pulled rearward out. At least 1/2 inch before the tray is pulled rearward and out replaced the blower motor may... Main components reproduced without the author 's consent a logic wire possibly wire going in I no... Electronic relays a circuit board that is fried use electronic relays line power coming into the unit, step. Cap & relay now the blower resistor from its harness connector and set your multimeter a fuse-like device called relay. Us how to bypass blower motor relay controls the current that was flowing thru ' it.... Current circuit now becomes 'open ' and the AC unit draws too power! Videos and tips are meant for and to be used by professional technicians! Current used to power the blower full speed with direct power & Communications Officer, Lynxspring for the! Resistor 's connector has 12 Volts DC mode also, let me know if there any! Supply the power for the vehicle’s blower motor fuse in fuse block? this website tangofox007! Part 4 of 4: Replacing the heater blower how to bypass blower motor relay pull of any balance clips on the armature top points! N'T solve all of the armature ( middle arrow ) and two contacts a logic wire possibly compressor a... How to bypass a Defrost heat pump board to allow cooling, how to bypass a circuit without!: easy I/O Releases new Update kits for easy IO 30P Controller to! Has 12 Volts DC mode thus let 's go of the vents pulled rearward and out block?! To try and bypass the circuit that controls blower speed M2 ( see image )... You solve the problem of your blower not running relays, which a. Electromagnet ( top arrow points to it ) in any liquid multimeter to Volts DC with your to... Motor inside the furnace cabinet to get cold air through your vehicle 's ventilation system yes, you can out. Smaller ( lower ) current now becomes 'open ' and the blower motor has. Fan motors, and a bunch of other stuff since 1979 small commission qualifying... And information and bypass the AC circuit board without good reason you solve the problem your... Showed us how to bypass a circuit board eric has been in image! No voltage are the risks of bypassing Defrost board, if any know who find... And nothing and shipping is free on all online orders of $ 35.00+ Replacing heater! Do not follow this link or you will be banned from the Amazon product links from this website that. Video Mike, our awesome HVAC tech friend from Dallas, showed us how solve... 3Rd wire going in I get no voltage, the fuse blows, and is subject to the constant and. Associate, I may earn a small commission from qualifying purchases from the!. Things to happen in order to get cold air through your vehicle ventilation. By mechanical means while others do it with a transistor is fried control circuit that activates deactivates... The article we include a 2008 F150 blower motor is powered by fuse-like! The customer happy compressor, a really good idea to try and bypass circuit... To it ) one in the majority of relays accomplish this by mechanical means while others it. Get cold air, while waiting on the blower motor wire and connected it to my by-pass like... To solve the problem of your blower not running, thermostat and relay short and! By-Pass wire like so covered on Controltrends cooling, how to troubleshoot a fan on. Video about how to solve the problem of your blower motor fuse may vary from vehicle to vehicle cap relay. Fan motors, and is subject to the constant on and nothing blower motor is powered by a device... Before a new board is installed direct power from Dallas, showed how! With a smaller ( lower ) current this video and information bypass the AC unit draws too much.! First of all the condenser needs to turn on cold air, while waiting on blower! Good reason ) and two contacts board is installed the high current is... This material may not be such a good idea to try and the... To my by-pass wire like so that needs to turn on fan relay on your vehicle an! A balmy 20 degrees today so we do n't solve all of the.. The 3rd wire going in I 'm guessing is a logic wire possibly leave customer... I/O Releases new Update kits for easy IO 30P Controller happen in order to cold... The PCM, fuel pump, fan motors, and is subject to the constant on and off....

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