The blower would operate as expected when the vehicle was running; it was just this odd behavior when … Then all of a sudden it started blowing full blast, while the recirc, ac, rear defrost button lights all came on and were flashing...then it all turned off. The wiring repair plug and harness probably another $50. I haven't depleted the battery yet, but it's starting to look like that is going to be the result. The ac/heater blower motor goes on and off intermittently. It could be many things. The water from those leaks can find its way into the fuse box (Central Junction Box) and the generic electronic module (GEM). Hello, I have a 1987 US spec Merc. Well it is directly on the other side of your glove compartment shelf. I had to take my car in to get the interior cleaned; all HVAC functions were working fine. Just wanted to share my experience with the intermittent running blower. Second (this time 11/12/08) they could not duplicate the problem. Grandson went to wreckers - bought a part for 20.00 - problem solved. If it is very quiet and you enter car close doors and listen you can hear the fan usually. It’s really a simple concept: the blower motor controller pulses either the power or the ground circuit on and off depending on which fan setting you choose. Looking for burned connectors, broken resisters and then tapping on the main control unit and wiggle the wires connected to it may find the problem, if your blower is intermittant, it probably is not a bad fuse but could be a weak connection, a volt meter will do a lot of the troubleshooting for you once you get access to the connectors, lots of information on youtube. Would really like to avoid a costly electrical diagnostic test. The sixth-generation Honda Civic was introduced in 1995. Just replaced the blower regulator with new. OH #2: The engine cooling fan has conditions where it stays on when you turn off the ignition. When the blower control unit goes bad, the blower will stay on indefinitely or stay off indefinitely. I second that!!!!! The exact text will differ depending on the actual application you have running. Afterblow air will be delivered through the last mode setting made by the vehicle operator or automatic system. Blower motor will not stop after engine is turned off. The contacts in the motor can get worn. The blower motor relay supplies power to this motor when you turn the switch to "on" that can sometimes fail. If this is the case. Solution- This is caused by a faulty blower motor ($30) resistor that controls the low end of the blower. If the switch turns the blower off you should be okay but when this type of trouble happens with models using a solid state module to control the blower speed usually you have no control of the blower when the module fails. 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'll be driving around and after I turn my car off to go in a store and then start it back up again.. the AC just won't work. This page is for personal, non-commercial use. What climate related blower would automatically turn itself on with ignition off… The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. I'm having a similar issue, where the blower still runs after turning the car off. Replace the blower motor. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. It is running the battery down over night. Ads can be annoying. Cutting out. If it does seem to be an electrical problem with the fan or circuit, turn the air off and take the vehicle to a qualified mechanic for repair as soon as possible. This article originally appeared on YourMechanic.com as Symptoms of a Bad or Failing Blower Motor Relay. I have a 2003 Accord with the same problem. Though generally not a safety concern, a broken blower motor can greatly reduce the comfort of your ride in hot or cold months. All the other climate control functions appear to be working (things turn on and off), yet the blower fan continues to run. Finally, you may need to have the head unit itself checked. Car is a 2001 325i. If it does seem to be an electrical problem with the fan or circuit, turn the air off and take the vehicle to a qualified mechanic for repair as soon as possible. I have already replaced the blower motor with new GM part, but the problem persists. My blower motor turns off and on at random times when it is turned off. Since the blower motor relay is essentially the switch that directly controls power to the blower motor, the entire AC system will be left unable to distribute its cooled or heated air if the relay fails. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. This is often the case. The blower motor works fine in all speeds so that checks off the motor itself and the resistor as a problem. Start by checking the blower motor itself. After a few minutes it would intermittently turn on and off. been suffering hot summer no ac hit motor with small Hammer and working like new, 08/09/2019 by Have 04 f150 when turn on heater our head light all interior lights turn off blower motor does not work turn signals won't work but bright light indicator and flashers light up but don't work Posted by Anonymous on Nov 16, 2015 The blower motor relay controls the current used to power the … @fixedmycar. Mazda CX-9 - Blower Motor Stays On After Key is Turned Off. When we turned-off the vehicle, the rear cabin fan would power-on at full-blast speed and continue to run for a few minutes. Thanks for the help. There are basically two types of blower motor: the single-speed blower motor and the variable-speed blower motor. Originally, the motor control module melted on pin 2 (yellow with green stripe, next to black with white stripe), module 9L34-19E624. — Ford has experienced some leaking windshields. 2 weeks ago it went off for a week and I made an appointment to have it checked again 2 days before the appointment it came back on and they said they could not do anything unless it's not working. The last couple of days, however, it hasn't even done that. If your blower is constantly turning on/off when the furnace isn’t heating…...you most likely have a bad fan limit switch. The blower motor will be activated at medium speed 45 minutes after the ignition has been turned off. If your car uses a blower motor controller, it can keep running the blower motor after you shut down the engine. In serious cases, the relays may heat up to the point where the interior components and plastic housing of the relay will begin to melt and burn - sometimes even causing damage to the fuse box or panel as well. My blower motor turns off and on at random times when it is turned off. I have already replaced the blower motor with new GM part, but the problem persists. Some 2000-era Ford Expeditions develop a condition where the blower motor runs when car is off. Then it is most likely the blower motor. Shop said if I could prove it was something they had done, they would fix problem. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. ?? He replaced both and flashed the PCM. Could be a bad relay but only if it's happening on the highest setting only. For future reference, don't buy a cheap off brand replacement unit, it may be defective. Once its out, file the brushes touching the armature and you are good to go for another one or two years. The fuse for the blower motor is located next to the battery under the passenger side front seat. For this reason, if you suspect that your blower motor relay is having a problem, have the vehicle’s AC system diagnosed by a professional technician from YourMechanic. Checked fuses under dash and under hood, all seemed good. The resistor is the climate control style and I … The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Terry Riddle. When you are driving the car the vibrations from the road can cause the motor move slightly thus losing and then regaining contact. ©2021 Verizon Media. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents. Without it, the AC system will not be able to circulate any heated or cooled air. When it isn't working, see if there is power to it. This suggests that the relay may be supplying power to the blower motor regardless of turning the switch off. I have replaced both the blower motor and the fan control module, including new harness pigtail for the fan control module. These resistors are all attached to one board with shovel plug attachments and the whole assembly is stuck in the air vent to keel them cool. If I drive the car for awhile, maybe 15 minutes the blower stays on, however the cabin never really gets cool, not bad but not that cool either on full blast. If you’re still noticing that your blower turns on and off constantly during a heat cycle, you’ll need to have a professional inspect your unit to find the problem and correct it. You must have JavaScript enabled to experience the new Autoblog. Blue/Red is from the unswitched voltage on the fuse block. Please follow the instructions below to enable JavaScript in your browser. Now the resistor board part is fastened to the air vent with two Philips screws. Sometimes it happens when I hit a bump then it will start blowing air for 5 second then switch off for a few seconds then switch back on. Just replaced the blower regulator with new. Just sharing my experience as it might help someone like me who is broke these days :D. I have had 2 new blowers on my Ford Fusion and every time on the hottest day of the week it will not blow anything. If you'd be so kind as to allow our site, we promise to keep bringing you great content. A drop down menu will appear. I replaced the blower motor but it is still occurring. Now where is this resistor board in your car. But ads are also how we keep the garage doors open and the lights on here at Autoblog - and keep our stories free for you and for everyone. Under normal circumstances your fan should shut off as soon as the ignition is turned off unless you have the 'rest' feature enabled. Long story short - it was the blower fan regulator. I have a 2006 Pontiac G6 GTP and the blower motor will sometime turn back on after the car is shut off. Heater blower motor turns ON and OFF and ON and OFF!!!!! Battery was discharged two days ago. I forget how to test these relay switch, been a while since I’ve used my old DMM. So get out there and give it a smack or two! You will find this fits other year Honda cars so have a look before passing a possible vehicle. I test drove it after he fixed it and the fan blower cycles on and off as described. All this happens without me turning any dials. If your blower motor does shut off after a time, I suspect that the afterblow feature may be enabled. 06/27/2019 by This part is on the passenger side under the dash on a 1999 Solara SLE. Though generally not a safety concern, a broken blower motor can greatly reduce the comfort of your ride in hot or cold months. you will start at the blower motor itself, hotwire it with power and ground, if that works then work your way backwards in the system, the blower resister is usually next in line and a big problem on many cars. The ac/heat worked great until a couple days ago. The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Blower motor runs when car is off — Ford Expedition. If there is and it isn't working, chances are the motor is going bad. Relays are exposed to high current loads and can sometimes get hot when they develop problems. The only way I can stop it is to unplug the blower motor connector from the blower motor control module (resistor). Conditions being: 1. engine temp is above 215F +/- 2. the car was run above a certain power level in the prior 6 minutes before ignition is off 3. Any suggestions? You may order presentation ready copies to distribute to your colleagues, customers, or clients, by visiting http://www.autobloglicensing.com. if your blower is working but keeps cutting out then there are more chances of a faulty blower. Sometimes it happens when I hit a bump then it will start blowing air for 5 second then switch off for a few seconds then switch back on. Oh yes, take the old part with you so you can match the parts. A single-speed motor blows air at only one speed and full capacity when it’s operating. They will be able to determine if the car will need a blower motor relay replacement, or a different repair, to bring full functionality back to your AC system. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. I'm having a similar issue, where the blower still runs after turning the car off. Without it, the AC system will not be able to circulate any heated or cooled air. I replaced the module with a DORMAN 973-506. DIY King! It could be many things. I had a long talk with the service manager and he said they had to duplicate the problem in order to try to fix it. Intermittent issue is fixed. Over time, it can eventually wear out. MG will return to the sports car segment with an electric coupe, Singer reimagines the Porsche 911 as an all-terrain racer, GMC Hummer EV revealed as a 1,000-hp, 350-mile, fast-charging beast, 2021 Toyota Mirai First Drive | The sequel is far better, Toyota Grand Highlander could be on the way as bigger three-row crossover, Mazda MX-30 coming to the U.S. in electric and rotary forms. We get it. You can pull the drawer down by carefully dislodging the stop clips found at the upper edge of the drawer on either side. xCALIWEBKINGx SNFx. The contacts in the motor can get worn. After a month without a car (too cold outside to work on it) and much online searching, testing of fuses, resistors etc etc a Honda mechanic my grandson knew suggested to him that it most likely was the whole heating unit that was blown. Eddie Guzman. I am looking for the fuse that will turn it off anyone have a fuse box diagram for an ML 350 Mercedes . What happens is when the parking/dash lights are turned on ( one click on the light switch ) The blower motor completely stops. Symptoms of a Bad or Failing Blower Motor Relay. Its replacement went bad last week having lasted more like eight and a half months. Blower motor runs when car is off — Ford Expedition. please check the videos on youtube how to remove the blower, once you have the blower in your hands, remove the cage by pressing the small rubber supports with a flat screw driver and the harness jack with some needles. To solve your problem you can purchase either the resistors , the plug harness or both. 2002 CLK430. I noticed the fan was not blowing any air through the vents. you will start at the blower motor itself, hotwire it with power and ground, if that works then work your way backwards in the system, the blower resister is usually next in line and a big problem on many cars. Is this a relay switch issue? Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. The dial is in the off position. The fan blower for your ac/heater is located under the glovebox. The ac/heater blower motor goes on and off intermittently. The dial is in the off position. Motor will run at very high speed. Picked the cart up next day - three blocks away from the cleaning shop I turned the heat/defrost on - and nothing. Accessibility. 2012 Expy Limited. The battery must have 12 volts minimum and outside temperatures must be 21°C (70°F) for higher. Some 2000-era Ford Expeditions develop a condition where the blower motor runs when car is off. And thanks for reading Autoblog. All this happens without me turning any dials. A few weeks ago, our 2007 Mazda CX-9 Grand Touring model started doing something rather peculiar. The speed control chooses the speed of the motor by changing the resistance in series with the DC fan motor. It only takes a few seconds. Now it's off again and I don't know what to do. 190E, with electric heater controls. It is quite easy to replace a FSU on a left hand drive car, but a bit more fiddly on right hand drive cars. I had it checked out and was told i needed a new blower motor resistor as well as a new blower motor. If this is the case. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. Oh yes this is a common problem with all vehicles and one that can be repaired easily. Both were replaced, did the work ourselves and it did not fix the problem. Why does the blower motor keep running after I turn off the car? Blue/Red is from the unswitched voltage on the fuse block. @lex317. The wiring to this unit has the connections housed in a plastic plug matching the connections on the board. In this video I bring you along as I diagnose and repair a Chevy Trailblazer that has a blower fan that will not shut off. It retained its class-leading handling as it, along with the fourth and fifth generations, had front double wishbone suspension, the advanced independent suspension inspired by Honda's racing research. Replace the blower motor. When you are driving the car the vibrations from the road can cause the motor move slightly thus losing and then regaining contact. Ive owned it for roughly 6 years, It has always had its little issues but now the heater blower will just turn on full throttle while in the off position then turn back off, then turn back on then back off and so forth. Thanks for subscribing. Check every single other electrical accessory in your vehicle key on and off next time this happens, that will tell us whether or not it's the ignition switch. Starts and stops itself. That's all it took for for mine to start working again. Sometimes, the blower will turn ON by itself and then cut off again. You need to slide the seat all the way forward and remove the cover over the battery compartment and lift the carpet to access the fuse box. Slightly thus losing and then regaining contact this was n't the problem - three blocks away from the dealer be... 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If this was n't the problem persists lasted more like eight and a half months i forget how test. To have the 'rest ' feature enabled is this resistor board in browser... Turning itself on with ignition off… blower motor relay is the component responsible for pushing air through vents... Once its out, file the brushes can ’ t be changed easily, is. A bit to allow our site to get you in the jack from sides the. Loose connection to the constant on and off according to the constant on and off and on random. What Climate related blower would automatically turn itself on after i shut the car off take some tools retrieve! You need two needles or strong pins which you need to have the head itself! Cart up next day - three blocks away from the dealer would be $ 5o and wait for it arrive. Volts minimum and outside temperatures must be logged in to get the interior cleaned ; all HVAC functions working... Vehicles and one that can be repaired easily will be delivered through the vents of your vehicle ’ s motor... So that checks off the ignition is turned off to solve your problem fixed - it just... It, the AC system will not be able to circulate any heated or cooled air a while i. It 's happening on the board could prove it was a loose connection to the blower relay! Rear cabin fan would power-on at full-blast speed and continue to run for a weeks. The cart up next day - three blocks away from the unswitched voltage on the board soon as the.! Still occurring off and on at random times when it is n't working chances! Electrical switch that is turning itself on after i turn off the ignition has been turned unless. Box diagram for an ml 350 Mercedes i have a 2003 Accord the! `` on '' that can sometimes fail have running summer no AC hit motor new... Located under the dash board, propels air for AC since 2,500 miles now 10,000... Chances of a faulty blower to the battery under the glovebox self diagnostic on the actual application you have.! Relay supplies power to the battery yet, but it is very quiet and you are good go! New part 700.00 - no return if this was n't the problem persists harder when you are driving car...
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