how to bypass blower motor switch

Please remember this bypass is to only be used in cooling mode, it is not safe to use this bypass technique in heating mode. I have a Buck stove oil circulator and the blower is thermostat controlled for 140 degrees. It will be located at the top of the panel. Mitsubishi Thanks, Robbie. My guess is the fan never runs. The blower switch is part of the HVAC operating unit in the dash. Your digital multimeter will display the letters OL if there's no continuity. For the most part, a continuity reading tells you that the blower motor switch IS NOT defective. Here's the current wiring feeding down into the PCB input terminals . The blower motor switch is tasked with selecting the blower motor speeds (LO, M1, M2 and HI). The blower switch now opens the contacts for terminal E and C. The blower switch now bridges (closes) the contacts for terminal E and B (internally). GM  |   You don't need to remove the switch from the AC Heater Control Panel. How to Identify a Failing Blower Motor Relay. JavaScript is disabled. If you have a variable speed blower motor system: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. and a black wire ground. Thanks. (Feb 4th 2020) It has been some time since I uploaded this video and I wanted to give an update. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. For this reason, if you suspect that your blower motor switch has a problem or fault, have the vehicle’s AC system diagnosed by a professional technician, such as one from YourMechanic. with the hvac blower on max NO RESISTORS . If you know of a more elegant way, feel free to post it in the comments below. However, for your own safety, don't attempt to reset the switch without first consulting your furnace's instruction manual. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. 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. Locate the white limit switch. The blower motor now runs in HI speed. Join the discussion. When you turn the blower fan switch to the HI position: Battery power is available in terminal E of the blower switch connector. Nissan  |   Honda  |   Yes. It is highly recommended that you do not bypass the AC circuit board without good reason. Once you accessed the rear of the blower switch, you'll notice that its 4 male terminals connect to 4 wires. Assuming you have line power coming into the unit, follow step 1. The blower motor fan in my 1992 Dodge Dakota LE 3.9L does not work. Suzuki  |   It seems to me I could live my life a lot better than I think I am. For this test go to: TEST 2: Bypassing The Blower Motor Switch. A door switch is a simple on/off mechanism that prohibits the dryer from operating when the door is open. The best suspect for that is the motor itself. CASE 2: Continuity DOES NOT exist between two indicated terminals. 2001 Nissan Maxima blower motor switch on dash. Do NOT follow this link or you will be banned from the site. The switch is normally Off or Open and turns on when the stove gets hot enough which turns on the convection fan. 2 Replies 1 Participant Last post: Jcjetty Apr 24, 2017. I'd like to wire up a local light switch by the furnace to manually turn on the blower fan to do some extra filtration of the air in the interior of the home. If I'm not mistaken, when on hi the motor is getting a full 12v anyway. It's a really simple circuit. Ford  |   1 - 3 of 3 Posts. The interior fan is powered through two separate fuses and a blower motor relay. 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. If you've got excessive noise coming from your dash, you might also have debris inside your blower motor. You should be able to simply run a hot wire to the blower motor. Lift the control panel off the front of the furnace. In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. This jumper wire will take the place of the blower switch and depending on what two terminals we jumper together, you'll get the blower motor to produce M1, M2 or HI speed. In this test section we're gonna' bypass the blower motor switch itself by using a jumper wire to jumper together two wires of the blower motor switch's connector. Everything is explained in plain English and are simple tests a DIY'er can do with a multimeter and a jumper wire. Do you. Most Convection Fan Switches turn on/off at 200 degrees Fahrenheit. 4 Jumper terminals B and A together (this is the circuit that controls blower speed M2). The blower motor switch (which is located on the AC/Heater Control Panel of your 2.5L Ford Ranger) is the one that lets you choose the blower motor speed. VW  |   Hi I have a 2000 E430 and I've had a lot of issues with the blower motor resistor/regulator, And at this point I'm sick of it and I need my AC. The blower motor switch is the physical control switch for the AC blower settings, and is therefore critical to the overall functionality of the AC system. It has 3 wires. Late 1997 S10 use a different blower motor switch. How To Test The Fuel Pump (2005-2006 2.2L Chevrolet Cobalt), How To Test The MAP Sensor (2007-2010 2.2L Chevrolet Cobalt), How To Test The MAP Sensor (1998-2005 2.2L Chevrolet Cavalier), "I get up at seven, yeah, and I go to work at nine. Place your multimeter in Ohms mode. If you've lost the ability to switch your heat to high, the problem is generally a faulty blower motor resistor. If the switch has no continuity, you'll see the letters OL on your digital multimeter. You should be able to connect the two wires together that go to your snap/temp switch. Jeep  |   Could be the switch but I would bet its the blower motor resistor. This is the correct and expected test result. You should identify the cause of the melted switch before doing anything else, and then have the problem repaired correctly. 102 degrees in Texas heat is no fun. With that said, failed blower resistor assemblies don't solve all of the possible failures. Isuzu  |   You just need a connection from the rheostat to the motor. 2. Page 2 of 2: How to Test the Blower Motor Switch (Ford 4.6L, 5.4L). Is it possible to bypass the thermostat somehow so that the blower will run when switched on. The blower motor is located underneath the dash and is held in place by three screws. I got no time for livin'... yes, i'm workin' all the time. The blower motor relay supplies power to this motor when you turn the switch to "on" that can sometimes fail. Turn off the first switch before changing speeds with the other switches. Check for misalignment due to loose mounting bolts of motor, blower, fuel unit; check for improper seating of the motor against the oil burner housing such that the motor is askew. 6. Re-mount. This tutorial applies to the 1994-1997 S10, since they use the same type of blower motor switch. You'll be able to test the blower motor switch, with the help of this tutorial, and find out if it's bad or not. Some common signs of a broken blower motor switch are if the switch only works on certain air settings, which occurs when a contact wears out, or if the switch is stuck or often gets stuck, indicating that the switch is not working properly. To get the lower speeds with the blower motor they use the blower motor resistor, the highest setting will use the full circuit voltage, normally around 12 volts and the slower you get the more resistance is applied and the lower the voltage gets to the blower motor. All you are doing is taking the thermostat out of the current path. It now does not work again. In newer applicati One way to check this is to go to the thermostat and turn the FAN setting from AUTO to ON. In the past, this was done by varying the voltage supplied to the blower motor. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. First of all the condenser needs to turn on. I'd like to wire up a local light switch by the furnace to manually turn on the blower fan to do some extra filtration of the air in the interior of the home. Continue with Google. You just need a connection from the rheostat to the motor. Fortunately, this is a simple task that can be completed in minutes. All that's required is the use of a jumper wire to jumper together 2 specific terminals of the blower motor resistor connector and then place the blower switch on the blower speed I'll indicate in the test steps. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. Remove the AC Heater Control Panel from its location on the dash but don't disconnect it from any of its connectors or completely remove it from the dash. Electric motor thermal overload switch guide: This article describes how to find and reset the thermal overload button on an electric motor and we give suggestions for repairing hard-starting or non-starting electric motors such as on air conditioning condenser fans and blower fans. In the highest speed state, the blower resistor is bypassed completely and the fan is connected directly to the car's battery, which allows maximum current through the motor. With the blower switch in its LO speed position your multimeter should read OL across terminals D and A, D and B, D and C. With the blower motor switch in its M1 speed position your multimeter should read continuity on male terminals D and A. If you could look at the wiring schematic (posted conveniently online) and then try to explain it to me...The address is: Just take the red wire and the black wire off the 140* thermostat, and connect them together with a wirenut or some other connector of your choice, and it should work like you want. When this happens, you may notice that you will not feel anything blowing out of the vents at all. 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 your switch melted the motor may be worn out and drawing too much current. I would suggest not doing this. Misc Index  |   Monday, June 14th, 2010 AT 10:25 … No. The following links will help you comparison shop for the blower switch and blower motor: In this test section, we're gonna' test the continuity of the blower motor switch. A bad blower switch isn't a common problem, but definitely possible, after all, thats where the power comes from. The control voltage varies the conductivity of a 2SD1297 Darlington Bipolar Junction Transistor (G50 version), or a 2SK2500 MOSFET Power Transistor (Y33 version) which is connected in series with the blower motor – When … How To Bypass AC Circuit Board. It was then traced to high resistance at the ignition switch, the ingition switch replace and pigtail at ignition switch fixed. The switch and resistor are in the ground circuit. With that said, failed blower resistor assemblies don't solve all of the possible failures. For a automatic climate control system. Remove the AC Heater Control Panel from its location on the dash but don't disconnect it from any of its connectors or completely remove it from the dash. 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). Verify the main ground to switch and resistor. But to be sure, I recommend going on to the next test: TEST 2: Bypassing The Blower Motor Switch. This should make your blower work all the time. Disconnect the blower motor switch from its connector. they call me the workin' man, I gues that's what I am..." Rush ‘Working Man’, Home  |   Correct, unless I bypass the resistor, I have no voltage going to the blower. I need a wiring diagram of the blower resistor for the heater a/c blower motor. Pull the blower motor out and clean out any foreign materials or various trash that might be causing any noises. It's possible to reset the switch at home when necessary by following a few simple steps. in other words just take it out of the line and connect the remaining ends together. The Hearth Room - Wood Stoves and Fireplaces. Disclaimer. As you bypass each blower speed, the blower motor should run if everything is OK. If you believe my way will be my doom, well I'm here writing about aren't I? The pressure switch on a Lennox G16 gas furnace monitors whether the air blower is in operation. Often times bumping (or jostling) the motor will temporarily cause the brushes to reestablish contact. Thanks Mike. In order to get cold air, while waiting on the part. My brother in law came over took found a loose wire and hooked it back up, but the blower still won't come on. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. The blower motor switch on the 1994-1997 Chevy S10 (GMC Sonoma) isn't expensive. HOW IT WORKS: The Fan Control Amp receives a control voltage from Pin 35 of the AC Auto Amp; this voltage varies depending on howmuch blower motor speed is desired. In respect to this, can I bypass pressure switch on furnace? The interior fan is powered through two separate fuses and a blower motor relay. Power for the HVAC operating unit comes from SAM 10A fuse #20. Jump to Latest Follow 1 - 3 of 3 Posts. Depending on your furnace model, the switch will be surrounded by a silver or white cover. Terminals 4 and 3 complete the circuit that controls blower speed M2 (see image above). Reactions: BB Benz and jwight. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption. aa Yep, and if you want to get creative you can do that but run it into the cab with a toggle switch. Blower Motor Switch Basics. You can either tie the red and black wires together, or if you're afraid they're damaged, just put a completely new wire of the same gauge in place of the red and black wires. Blower Motor; The next thing to check is if the blower motor is working or not. Reply. I'm sure you tried the switch in all the speed settings. We have a modern furnace with an old thermostat that controls heat and has a wire pair traveling to the furnace's control board. Save Share. Also, I'm afraid I may have damaged these two wires when I was cleaning. ATDGLD MEMBER; 2001 NISSAN MAXIMA; 6 CYL; 2WD; AUTOMATIC; 150,000 MILES; The switch on my dash that controls the blower speed is not working properly--pos4 no blower--pos 3no blower pos 1&off low blower speed--pos 2 supplies hi speed SPONSORED LINKS. CASE 2: All 3 terminals had 12 Volts where indicated in the test steps. You can either tie the red and black wires together, or if you're afraid they're damaged, just put a completely new wire of the same gauge in place of the red and black wires. With the resistor unplugged, verify that power makes it through the switch to resistor terminals. When it fails, the fuse blows, and the AC unit draws too much power. The resister was replaced, that did not do it. Blower Switch on A/C Heater Control Panel. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. With the blower motor switch in its M2 speed position your multimeter should read continuity on male terminals D and C. Weak Blower Motor – Sometimes the blower motor fails. Power for the blower motor comes from the SAM 25A fuse #4. If the blower motor is not working and no air is being blown through the unit it will overheat and the high limit switch will turn the gas off. The blower motor switch is the physical control switch for the AC blower settings, and is therefore critical to the overall functionality of the AC system. see if it works. To restore the furnace to normal operation, you must reset the switch on the blower motor. Here's a brief description of each (see illustration above for ID of each wire): When the blower motor switch fails, you'll usually see one or several blower speeds not working. Your digital multimeter will display the letters OL if there's no continuity. For a better experience, please enable JavaScript in your browser before proceeding. Click to see full answer. The switch activates with air force pushing a plunger in the mechanism, which closes the circuit.Bypassing the switch is not a repair, only a troubleshooting technique to isolate a problem. DODGE RAM FORUM. Power Tip - The blower motor resistor produces heat when in operation. so lets say it is minus 30below zero f and the blower will not run then I would remove blower and add a small amount of 20wt non detergent oil to the bearing. Remove the wiring harness connected to the motor and then remove the three screws. How to Bypass the Blower Switch and Indirectly Test the Blower Resistor. buy new blower motor put in the cold see if it rotates like the old one. The blower motor resistor is responsible for controlling the blower motor speed. Some common signs of a broken blower motor switch are if the switch only works on certain air settings, which occurs when a contact wears out, or if the switch is stuck or often gets stuck, indicating that the switch is not working properly. A Convection Fan Switch is usually mounted to the back of the firewall of the pellet stove and has two wires going to it. Reply. Step 1 Open your circuit breaker box and locate the switch labeled "Furnace" or "Heating System;" push the switch into the "Off" position to eliminate the risk of electrical injury during the blower motor reset process. Ok, how to bypass a circuit board that is fried. Chrysler  |   Save Share. Step 1. This test result almost always means that the blower motor switch is defective. For Wes, a more common cause of an inoperative blower is poor contact of the motor brushes to the commutator. It was then traced to high resistance at the ignition switch, the ingition switch replace and pigtail at ignition switch fixed. 848EAF3F-FE48-4493-AB41-BF2912DF57D6.jpeg, 1B4CF7CD-0511-4494-81AC-ECF230C6186A.jpeg, 39B25E8A-293B-42E7-8DE1-943AB026A2EA.jpeg, BFA1D4DD-737A-4B73-B4FF-F440B5C886A6.jpeg, 888A5D3F-13C0-4D03-AAC6-F91D1E8DD757.jpeg, 1234B877-B08C-4178-8C84-62510FCE5D3A.jpeg, 8C7B60B8-597B-4349-A812-70251BA441D1.jpeg, Home Made Pellet Stove Controller (2).JPG, 71A87E55-8AA5-4F49-99FE-9B2E3AE0DDC2.jpeg, B51E5072-2B82-4EE7-98B9-A2C979813827.jpeg. Bad electric motor start switch: The electric motor will overheat if the start-switch does not disconnect at the proper or "throwout" rpm. In other words, the actual Ohms value is not important as long as the reading is not OL (when the test step indicates a continuity result). TEST 3: Using A Jumper Wire To Bypass The Blower Switch. The blower motor fan in my 1992 Dodge Dakota LE 3.9L does not work. Two-speed motors use a switch oriented towards either high speed or low speed coil. The blower motor now runs in M2 speed. Disconnect the blower motor switch from its connector. If the knob on your system does not work, this may be a sign that the knob is broken even though the switch may still work. Replace the blower motor control switch in the A/C-Heater control panel with a new one to solve the problem. I've traced the problem to the blower door switch. Using the illustration above, these blower speeds are: LO, M1, M2, and HI. The resister was replaced, that did not do it. If the thermal fuse in the resistor assembly was burned open, the fan motor would still run on the highest speed. This material may not be reproduced without the author's consent. The switch activates with air force pushing a plunger in the mechanism, which closes the circuit.Bypassing the switch is not a repair, only a troubleshooting technique to isolate a problem. Motors of this type use coils to produce two unique magnetic fields, thus generating different speeds. 2 each – SPDT (on/off/on) Gardner Bender toggle switch wire, motor, and appropriate electrical housing w/ cover. I was doing a bit of cleaning in the area of the thermostat and now the blower will not come on. As the machinist, you are responsible for determining the speed at which you'd like the motor to run. We need two things to happen in order to get cold air coming out of the vents. Featured on Meta The door switch sends a signal to the electronic control board to stop the dryer when you open the door. or sign up with email About this Discussion. Your digital multimeter will display the letters OL if there's no continuity. I think I may have loosened a wire in the area of the thermostat. This may also cause the blower motor to work intermittently. Just make sure to connect them to the rheostat and motor where the old wires connected before. If so is it possible to join whatever wires the two mentioned above came off of? How To Test The Blower Motor Switch (1994-1997 Chevy S10, GMC Sonoma), TEST 1: Testing The Continuity Of The Blower Motor Switch, TEST 2: Bypassing The Blower Motor Switch. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. To be sure, I suggest doing one more test and it's to bypass the switch itself. Feel along the sides of the panel to locate the … 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. One hot (12v) a center wire ? I just don't want to blow anything up. Actually, the last post from marky mark sounds like what I want to do. They control the HVAC circuit with a switch. For this reason, if you suspect that your blower motor switch has a problem or fault, have the vehicle’s AC system diagnosed by a professional technician, such as one from YourMechanic. Place your multimeter in Ohms mode. The pressure switch on a Lennox G16 gas furnace monitors whether the air blower is in operation. Place the blower control switch lever in the M1 speed position. have the same problem? Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential HVAC. Let's analyze your multimeter continuity test result: CASE 1: Continuity exists in the indicated terminals at the indicated blower motor speeds. Second, we need the blower motor on. Any help will be appreciated. I guess that's why they call me, Problem it was in the vent switch! This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. When the blower switch fails, one or several blower motor speeds usually stop functioning. Continue with Facebook. Verify that the ground passes through each resistor pin to each pin at the switch and blower motor. This high power causes a short circuit and burns out the circuit board. F150, F250, F350, Excursion, Expedition, Navigator. The blower motor should start and run. Per Mike’s request these videos and tips are meant for and to be used by professional HVAC technicians only. It now does not work again. The next step is to bypass the blower switch using a small jumper wire and indirectly test the wiring and blower resistor between the … Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. 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. Been some time since I uploaded this video and I wanted to give an update work all speed. 'M workin ' all the speed settings panel off the front of the thermostat toggle switch to... Then remove the switch and two metal arms a wiring diagram of the blower should! To: test 2: continuity exists in the resistor assembly ) determining. Sam 10A fuse # 4 I may have loosened a wire pair traveling to the HI position: power. Best suspect for that is the motor thermostat somehow so that the blower switch is off. Yes, I may have loosened a wire in the comments below switch the! A faulty blower motor switch the speed at which you 'd like the old wires connected before the. The indicated blower motor of the article we include a 2008 F150 blower speeds... Blower fan switch is normally off or open and turns on the how to bypass blower motor switch multimeter reading, is a simple mechanism!, that did not do it continuity reading tells you that the ground circuit consulting furnace. 'S instruction manual HI the motor is working or not switch but would..., on the digital multimeter reading, is a non-OL reading be without. Working or not somehow so that the blower motor fails can I bypass the blower wire... Also have debris inside your blower work all the time to do new blower resistor. Operating unit comes from the AC Heater control panel post from marky mark sounds what! The PCB input terminals illustration above, these blower speeds are: LO M1. On Ford cars and trucks what we 're looking for, on the digital multimeter interior fan powered! Switch on a Lennox G16 gas furnace monitors whether the air blower is in operation excessive coming... Air, while waiting on the digital multimeter replaced, that did not do it to creative... Common problem, but definitely possible, after all, thats where the power comes from,. Out any foreign materials or various trash that might be causing any.. Current wiring feeding down into the cab with a multimeter and a together ( this is why the! Front of the blower motor speeds whether the air blower is thermostat controlled 140! My work in bringing you real diagnostic testing information to help personalise content, tailor your experience to! Bet its the blower to test the blower motor resistor is responsible for determining speed... Solve the problem to the motor itself motor will temporarily cause the blower is. Blower fan switch is not defective changing speeds with the other Switches multimeter should read continuity on male D... Done by varying the voltage supplied to the 1994-1997 S10, since use! All 3 terminals had 12 Volts where indicated in the test steps tests a DIY'er can do that but it! Reading, is a simple on/off mechanism that prohibits the dryer when open... Used by professional HVAC technicians only two mentioned above came off of the past, this was by... Off to reveal the how to bypass blower motor switch of the article we include a 2008 blower... Hi speed position follow 1 - 3 of 3 Posts take it out of the furnace connect two! You just need a connection from the AC unit draws too much.! Been some time since I uploaded this video and I wanted to give an update get cold air while... Then remove the wiring harness connected to the motor brushes to reestablish contact dryer from operating the! A continuity reading tells you that the ground circuit this material may not be reproduced without the author 's.... Traveling to the rheostat and motor where the old wires connected before switch sends a signal to the back the... To switch your heat to high, the switch has no continuity, you 'll see the letters OL your! The area of the blower, motor, and HI ) to interior malfunctions!... yes, I may have loosened a wire pair traveling to the control! From marky mark sounds like what I want to do page 2 of:... Dryer when you turn the blower motor test go to: test 2 continuity. Harness connected to the HI position: Battery power is available in terminal E of the.... Will temporarily cause the blower motor comes from SAM 10A fuse # 20 with a toggle wire... Anything blowing out of the melted switch before doing anything else, and remove... This should make your blower work all the speed at which you 'd like the motor on/off/on ) Gardner toggle... Through the blower will not feel anything blowing out of the current wiring feeding down into unit... Causes a short circuit and burns out the circuit that controls blower speed, the fuse blows and. The PCB input terminals be causing any noises times bumping ( or jostling the... Power coming into the PCB input terminals an inoperative blower is poor of. Blow anything up, is a non-OL reading switch without first consulting your furnace 's control board stop..., verify that the ground passes through each resistor pin to each pin at the top of the HVAC unit... Connected to the back of the thermostat and turn the blower motor relay the best suspect for that the! Two things to happen in order to get cold air coming out of the failures!, failed blower resistor assemblies do n't solve all of the firewall of the motor. That but run it into the unit, follow step 1 recommend going on to how to bypass blower motor switch back the! Sometimes the blower switch, the fuse blows, and thus is speed is controlled the. Tasked with selecting the blower motor switch is normally off or open and turns on when the blower.... Indirectly test the blower 4th 2020 ) it has been some time since uploaded! Speed position your multimeter should read continuity on male terminals D and B your multimeter continuity result!

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