# 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. The interior fan is powered through two separate fuses and a blower motor relay. Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode. Any ideas as to what it could be/ I do daycare and need the front heat. On the W123, for example, the majority of the ACC system (including the blower) is powered through a 16 amp fuse. Our viewers are from all over the world so you never know who will find you on Controltrends. The blower motor relay is the electrical switch that is used to supply the power for the vehicleâs blower motor. The electric relay in a furnace is responsible for relaying electrical power to the heating elements and the blower motor inside the furnace cabinet. An excellent video about how to solve the problem of your blower not running. This is a coil of wire wrapped around a soft iron core. 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. Weak Blower Motor â Sometimes the blower motor fails. This high power causes a short circuit and burns out the circuit board. 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. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. Isuzu | My time delay relay switch has gone bad. 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. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption. for Automotive Diagnostic Testing. Notify me of follow-up comments by email. took the entire can! Over time, it can eventually wear out . 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. Checking the operation of a fan relay on your vehicle is an easy procedure. Does it even matter how long it takes? This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. I see the 3rd wire going in I'm guessing is a logic wire possibly. What are the risks of bypassing Defrost Board, if any? Photo 2 of 3 (in the image viewer) shows the spring (bottom arrow). 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? Please remember this bypass is to only be used in cooling mode, it is not safe to use this bypass technique in heating mode. GM | The troubles with faulty relays. 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. 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. Whatâs Ahead for 2021 — Marc Petock, Chief Marketing & Communications Officer, Lynxspring. Looks like you might be a HVAC contractor so please feel free to add your companies website and info on what you guys do. The blower motor pushes the warm or cold air through your vehicle's ventilation system. I want to bypass it tonight so that my blower will run until I can pick up a - Answered by a verified HVAC Technician. 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. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Do NOT follow this link or you will be banned from the site! The blower motor should start and run. 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. In order to get cold air, while waiting on the part. Aye, Captain! Eric says: November 4, 2011 at 2:14 pm. Disconnect the motor from the main power supply. The armature acts as a switch and completes the circuit that will have the high current flowing thru' it. The relay has the following core components inside. if you aren't good with wiring, may not be such a good idea to try and bypass the circuit. 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. In newer applicati 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". 6. In his last video Mike, our awesome HVAC tech friend from Dallas, showed us how to troubleshoot a fan control board. 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 . 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. 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. The most common problem on these relays ⦠that needs the voltage/current. Other than that is a balmy 20 degrees today so we don't really need the heat haa. 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. First of all the condenser needs to turn on. Everything works on climate control rear blower,wiper rear window defogger but turn the front fan on and nothing. 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)). Photo 2 of 3 (in the image viewer) shows the electromagnet (top arrow points to it). Disclaimer. That would sure beat nothing and it would hurt nothing. With that said, failed blower resistor assemblies don't solve all of the possible failures. The majority of relays accomplish this by mechanical means while others do it with a transistor. Order Blower Motor Relay for your vehicle and pick it up in storeâmake your purchase, find a store near you, and get directions. Is the blower motor the only component powered through that fuse? This relay is used for the PCM, fuel pump, fan motors, and a bunch of other stuff. A digital or analog multimeter will work. I have a nordyne #E2EB-015HA I replaced the blower motor run cap & relay now the blower will not shut off. Use a test light to check for voltage. The motor itself is very low tech. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. Just Announced: Easy I/O Releases New Update kits for Easy IO 30P Controller. Part 4 of 4: Replacing the heater blower relay. 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 Use the schematics included in your ownerâs manual to locate a path to the relay. The spring now acts on the armature to place it back into its normally open position. Assuming you have line power coming into the unit, follow step 1. You might ask. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Bench Testing A Ford Relay (A Step-by-Step Guide), Cómo Probar En Banco Un Relé De Ford (Relé Grande), Buying A Digital Multimeter
They control the HVAC circuit with a switch. The high current circuit now becomes 'open' and the current that was flowing thru' it stops. Terminals 4 and 3 complete the circuit that controls blower speed M2 (see image above). Required fields are marked *. Just keep in mind that many modern cars use electronic relays. 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). Ok, how to bypass a circuit board that is fried. 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. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Your email address will not be published. When the electromagnet gets de-energized, it loses it's magnetic power and thus let's go of the armature. 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. ", Home | Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. 2008 F150 blower motor relay controls the current used to power the blower wheel a fan relay your! Completes the circuit that will have the high current circuit is the motor. Never know who will find you on Controltrends me know if there are any controls topics you would to! Wire possibly help you solve the problem on your vehicle the condenser needs to turn.!, an A/C compressor, a really good idea when the board has failed you! Board, if any thus current ) to the component that needs to activate of! 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