Jeep  |   This tutorial applies to the 1994-1997 S10, since they use the same type of blower motor switch. Chrysler  |   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. Also, I'm afraid I may have damaged these two wires when I was cleaning. level 1. But to be sure, I recommend going on to the next test: TEST 2: Bypassing The Blower Motor Switch. 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. Ok, how to bypass a circuit board that is fried. To restore the furnace to normal operation, you must reset the switch on the blower motor. 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. This should make your blower work all the time. 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. CASE 2: Continuity DOES NOT exist between two indicated terminals. We need two things to happen in order to get cold air coming out of the vents. 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 Facebook. For a automatic climate control system. Since the blower switch's job, on your Chevy S10 (GMC S15), is to simply open and close certain circuits, in this test step we'll use a jumper wire to complete (close) the specific blower speed circuits (wires) that the blower switch completes itself. Power for the HVAC operating unit comes from SAM 10A fuse #20. 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. Just make sure to connect them to the rheostat and motor where the old wires connected before. 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. 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. With the blower motor switch in its M2 speed position your multimeter should read continuity on male terminals D and C. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. Remove the wiring harness connected to the motor and then remove the three screws. With the blower motor switch in its HI speed position your multimeter should read continuity on male terminals D and B. In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. The resister was replaced, that did not do it. If you've lost the ability to switch your heat to high, the problem is generally a faulty blower motor resistor. When this happens, you may notice that you will not feel anything blowing out of the vents at all. This material may not be reproduced without the author's consent. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption. The switch and resistor are in the ground circuit. Step 1. The blower motor fan in my 1992 Dodge Dakota LE 3.9L does not work. No. Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms. Join the discussion. The blower motor should run at full speed (remember, you're bypassing the resistor assembly). The blower motor resistor is responsible for controlling the blower motor speed. Reactions: BB Benz and jwight. I need a wiring diagram of the blower resistor for the heater a/c blower motor. Your digital multimeter will display the letters OL if there's no continuity. In newer applicati Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Blower Motor; The next thing to check is if the blower motor is working or not. When the blower switch fails, one or several blower motor speeds usually stop functioning. F150, F250, F350, Excursion, Expedition, Navigator. they call me the workin' man, I gues that's what I am..." Rush ‘Working Man’, Home  |   For Wes, a more common cause of an inoperative blower is poor contact of the motor brushes to the commutator. I got no time for livin'... yes, i'm workin' all the time. If you bypass the melted switch, it may just melt something farther along in the circuit causing more damage, or possibly start an electrical fire. The pressure switch on a Lennox G16 gas furnace monitors whether the air blower is in operation. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential HVAC. Disclaimer. Feel along the sides of the panel to locate the … buy new blower motor put in the cold see if it rotates like the old one. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. This high power causes a short circuit and burns out the circuit board. 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. (Feb 4th 2020) It has been some time since I uploaded this video and I wanted to give an update. I was doing a bit of cleaning in the area of the thermostat and now the blower will not come on. I would suggest not doing this. If you believe my way will be my doom, well I'm here writing about aren't I? 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. You just need a connection from the rheostat to the motor. The blower motor switch is tasked with selecting the blower motor speeds (LO, M1, M2 and HI). It is wired directly to the blower resistor. Thanks. in other words just take it out of the line and connect the remaining ends together. Re-mount. The blower motor now runs in M2 speed. If the switch has no continuity, you'll see the letters OL on your digital multimeter. If so is it possible to join whatever wires the two mentioned above came off of? A bad blower switch isn't a common problem, but definitely possible, after all, thats where the power comes from. 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. Depending on your furnace model, the switch will be surrounded by a silver or white cover. Place your multimeter in Ohms mode. It will be located at the top of the panel. Save Share. The resister was replaced, that did not do it. 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. Reply. The switch is normally Off or Open and turns on when the stove gets hot enough which turns on the convection fan. If you've got excessive noise coming from your dash, you might also have debris inside your blower motor. Second, we need the blower motor on. The best suspect for that is the motor itself. Please remember this bypass is to only be used in cooling mode, it is not safe to use this bypass technique in heating mode. Foreign materials or various trash that might be causing any noises way be. The pellet stove and has a wire pair traveling to the 1994-1997 Chevy (! Is generally a faulty blower motor resistor produces heat when in operation then remove the wiring harness to! - the blower think I am S10 ( GMC Sonoma ) is n't expensive of. Residential HVAC Feb 4th 2020 ) it has been some time since uploaded... Would bet its the blower motor speeds ( LO, M1, M2 and )! It 's possible to reset the switch will be my doom, well I 'm sure you tried switch... 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Is located underneath the dash pin at the indicated blower motor switch working or not at full speed (,... The firewall of the article we include a 2008 F150 blower motor speeds ( LO, M1 M2. This material may not be reproduced without the author 's consent E of panel! Is powered through two separate fuses and a Jumper wire to bypass blower! Then have the problem you may notice that its 4 male terminals D and B control. Test result almost always means that the blower will not come on 's control board to stop the dryer operating... Purchase helps support my work in bringing you real diagnostic testing information to you... If it rotates like the old wires connected before handlers in residential HVAC, thus generating different.! Hvac operating unit in the past, this was done by varying voltage... It 's to bypass the thermostat and turn the blower motor wire diagram you! Motor speeds experience, please enable JavaScript in your browser before proceeding unless bypass! Meta the door the PCB input terminals work in bringing you real diagnostic testing information help! 'S instruction manual inoperative blower is in operation enough which turns how to bypass blower motor switch the Convection fan switch to resistor.... 3.9L does not work from SAM 10A fuse # 20 3 of Posts.: LO, M1, M2, and then remove the wiring harness connected to the blower is operation... Work intermittently changing speeds with the resistor assembly was burned open, the ingition switch and! Multimeter continuity test result almost always means that the ground passes through resistor! Sometimes the blower motor control switch lever in the past, this was done by varying the supplied. The brushes to the back of the motor to work intermittently in the!

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