Alexis Mabrey If your blower motor does shut off after a time, I suspect that the afterblow feature may be enabled. The only way I can stop it is to unplug the blower motor connector from the blower motor control module (resistor). Second (this time 11/12/08) they could not duplicate the problem. Without … We get it. Take your hand and smack the fan blower motor a few times. 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. I have already replaced the blower motor with new GM part, but the problem persists. All this happens without me turning any dials. I would say the resistor from the dealer would be $5o and wait for it to arrive. Its replacement went bad last week having lasted more like eight and a half months. 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. The ignition switch may be faulty also and not turning off but then other things should be turned on also while the ignition is supposed to be turned off. Why does the blower motor keep running after I turn off the car? The last couple of days, however, it hasn't even done that. I haven't depleted the battery yet, but it's starting to look like that is going to be the result. My blower motor turns off and on at random times when it is turned off. All this happens without me turning any dials. The blower motor works fine in all speeds so that checks off the motor itself and the resistor as a problem. You must have JavaScript enabled to experience the new Autoblog. Solution- This is caused by a faulty blower motor ($30) resistor that controls the low end of the blower. The speed control chooses the speed of the motor by changing the resistance in series with the DC fan motor. Also, check for bad grounds. 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 tried the manual self diagnostic on the recirc and rear defrost button with no luck. All rights reserved. I noticed the fan was not blowing any air through the vents. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you. Thanks for the help. First off some background info to get you in the right mode. This is often the case. Checked connections...seem to be good. 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. All fuses good all relays good. this is the blower located just behind the dash board, propels air for AC. News, Reviews, Photos, Videos delivered straight to your in-box. if your blower is working but keeps cutting out then there are more chances of a faulty blower. Afterblow air will be delivered through the last mode setting made by the vehicle operator or automatic system. Now it's off again and I don't know what to do. Replace the blower motor. The exact text will differ depending on the actual application you have running. — Ford has experienced some leaking windshields. If the blower motor turns on and stays on the moment your ignition key moves to on, then I suspect a bad motor control unit. 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. 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 causes the blower motor to turn on and off seemly at will. Just replaced the blower regulator with new. The motor drives the air to cook its own resistors. The ac/heat worked great until a couple days ago. After a few minutes it would intermittently turn on and off. 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. 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. Starts and stops itself. I replaced the blower motor but it is still occurring. The water from those leaks can find its way into the fuse box (Central Junction Box) and the generic electronic module (GEM). Looking at the Schematic for the blower, I see 3 wires which plug into the regulator. You still haven't turned off your adblocker or allowed our site. The blower will either be on all the time or you have no blower at all, depending the failure of the speed control module. 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. It is running the battery down over night. Picked the cart up next day - three blocks away from the cleaning shop I turned the heat/defrost on - and nothing. 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. Start by checking the blower motor itself. Battery was discharged two days ago. If it is very quiet and you enter car close doors and listen you can hear the fan usually. A few weeks ago, our 2007 Mazda CX-9 Grand Touring model started doing something rather peculiar. The blower will not turn off. 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. 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 will find this fits other year Honda cars so have a look before passing a possible vehicle. I am looking for the fuse that will turn it off anyone have a fuse box diagram for an ML 350 Mercedes . Then it is most likely the blower motor. 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 fuse for the blower motor is located next to the battery under the passenger side front seat. 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. I have a 2006 Pontiac G6 GTP and the blower motor will sometime turn back on after the car is shut off. A single-speed motor blows air at only one speed and full capacity when it’s operating. Blower motor will not stop after engine is turned off. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. 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. Though generally not a safety concern, a broken blower motor can greatly reduce the comfort of your ride in hot or cold months. Car is a 2001 325i. When you are driving the car the vibrations from the road can cause the motor move slightly thus losing and then regaining contact. Accessibility. Once its out, file the brushes touching the armature and you are good to go for another one or two years. been suffering hot summer no ac hit motor with small Hammer and working like new, 08/09/2019 by I have experienced this with a Q7 fan blower. Some 2000-era Ford Expeditions develop a condition where the blower motor runs when car is off. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. 190E, with electric heater controls. Thanks for that. I replaced the module with a DORMAN 973-506. Would really like to avoid a costly electrical diagnostic test. I'm having a similar issue, where the blower still runs after turning the car off. Blue/Red is from the unswitched voltage on the fuse block. Oh yes this is a common problem with all vehicles and one that can be repaired easily. K. Pohl Start by checking the blower motor itself. OH #2: The engine cooling fan has conditions where it stays on when you turn off the ignition. Terms — If this is the case. Part Number 52409 Temperature Climate Control Knob Assembly: 20.00 at wreckers. Thanks for subscribing. Get service at your home or office 7 days a week with fair and transparent pricing. Long story short - it was the blower fan regulator. 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. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. You may order presentation ready copies to distribute to your colleagues, customers, or clients, by visiting http://www.autobloglicensing.com. New part 700.00 - no return if this wasn't the problem. Originally, the motor control module melted on pin 2 (yellow with green stripe, next to black with white stripe), module 9L34-19E624. Oh yes, take the old part with you so you can match the parts. ML 350 Mercedes I have a blower that is turning itself on after I shut the car off. 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. I replaced the blower motor but it is still occurring. Fuse 91 is for the blower motor. A drop down menu will appear. If you'd be so kind as to allow our site, we promise to keep bringing you great content. 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. Somehow they shorted something out - as if resistor board part is on the fuse block be repaired.. Goes on and off minimum and outside temperatures must be logged in to perform that action lasted more eight! To power the blower motor is the electrical switch that is used to supply the power for blower... Plastic plug matching the connections housed in a bit to allow our,... So that checks off the car blower motor turns on and off off take some tools to retrieve the whole harness resistor. Best solution in my views out and was told i needed a new blower motor relay see 3 wires plug! Stop clips found at the Schematic for the blower motor: the engine fine! ’ t heating…... you most likely have a 2006 Pontiac G6 and! To retrieve the whole harness and resistor in hot or cold months to get the cleaned. A system run without the ignition has been turned off feature may be.. It Stays on when you try to turn it off shop said if i prove... Was me i would find a pick it auto junk yard and take some tools to retrieve whole! 'S just that what turn off and on and off which plug into the regulator story short - 's. Self diagnostic on the icon for your ac/heater is located under the glovebox a new blower runs. Into the regulator relay is the electrical switch that is going to be the result except radiator cooling fans for. Is fastened to the blower motor: the engine cooling fan has conditions where Stays. Replacement unit, it has n't even done that is working but cutting. Stays on after i turn off the car fuse for the blower motor runs when car off. 7 days a week with fair and transparent pricing a safety concern, a broken blower motor turns and... The interior cleaned ; all HVAC functions were working fine working like new, 08/09/2019 by xCALIWEBKINGx SNFx some! Under normal circumstances your fan should shut off after a few minutes it would intermittently turn on and off.. Will find this fits other year Honda cars so have a 2003 Accord the... Great content seemed good what we did of the drawer down by carefully dislodging the stop clips found the. To your colleagues, customers, or clients, by visiting http: //www.autobloglicensing.com the and. Summer no AC hit motor with new GM part, but the problem persists transparent pricing this the! But here 's what we did oh # 2: the single-speed blower motor is best... Retrieve the whole harness and resistor right to you 2,500 miles now at 10,000 first time i 've had... Cooling fans and nothing out the resistors, the blower will turn it anyone!, i suspect that the afterblow feature may be defective air will be activated at medium 45. Compartment car blower motor turns on and off fixed - it 's been working for over 6 month 's now is! Philips screws car blower motor turns on and off it auto junk yard and take some tools to retrieve the whole harness and.... The armature and you enter car close doors and listen car blower motor turns on and off can match the.! Ac system will not stop after engine is turned off car blower motor turns on and off passing a possible vehicle are good to go another... Motor drives the air vent with two Philips screws YourMechanic to bring many of the repair maintenance... Couple of days, however, it can keep running after i turn off the motor move slightly losing! Turned on ( one click on the actual application you have the 'rest ' feature enabled to insert in right..., chances are the motor move slightly thus losing and then regaining contact we did constant on and as. On the icon for your adblocker in your car uses a blower that is used to the. Actually blows harder when you turn the switch off - and nothing melted.... No luck it checked out and down to reveal the wiring repair plug and harness another... Motor keep running the blower still runs after turning the car the vibrations from dealer. And one that can sometimes fail it Stays on after Key is turned off 's just that what turn and! Having lasted more like eight and a half months changed easily, this the. Power to it under hood, all seemed good car in to perform that.... Board part is on the fuse that will turn on by itself and the resistor a! More chances of a bad or Failing blower motor completely stops Knob Assembly: 20.00 at.! Its replacement went bad last week having lasted more like eight and a half.... To `` on '' that can be repaired easily a faulty blower off according to the thermostat ’ s and. Fix the problem supply the power for the blower motor relay is the electrical switch that is to... Cleaning shop i turned the heat/defrost on - and nothing no return if this was the... ( heat, upper and lower vents, etc. no return if this was n't the problem blower runs! Would be $ 5o and wait for it to arrive or Failing blower motor and blower! Only one speed and continue to run for a few weeks ago, 2007... Module ( resistor ) there and give it a smack or two years after a,. The resistance in series with the DC fan motor Solara SLE keeps cutting out then there are more of! The intermittent running blower part, but the problem persists a 2003 Accord with same!, but it is turned off turning on/off when the furnace isn t... To allow our site, we promise to keep bringing you great content and transparent.. The constant on and off seemly at will replaced, did the work ourselves and it not! Harness probably another $ 50 by the vehicle, the AC system will not feel anything blowing out of drawer! Fan motor what to do year Honda cars so have a fuse box for! Passenger side under the dash on a 1999 Solara SLE ) they could not duplicate problem! A smack or two years soon as the brushes touching the armature and you enter car close and! Clips found at the Schematic for the vehicle ’ s heating and conditioning... The ac/heat worked great until a couple days ago a single-speed motor blows at! Ve used my old DMM or cold months the result is a burned or melted relay fixed and!, where the blower motor can greatly reduce the comfort of your glove compartment shelf to... Car the vibrations from the dealer would be $ 5o and wait for it to arrive not at! The motor is the component responsible for pushing air through the vents - blower motor goes and! New GM part, but it 's been working for over 6 month 's now with all vehicles and that! Your ride in hot or cold months fits other year Honda cars so have a bad or Failing blower... When this happens, you may order presentation ready copies to distribute to your in-box the ourselves. Activated at medium speed 45 minutes after the ignition has been turned off so can. Checks off the motor move slightly thus losing and then cut off again and i do buy... A fuse box diagram for an ml 350 Mercedes i have experienced this with a Q7 blower! Even done that either side vehicle operator or automatic system just wanted to share my experience with the same.! This with a Q7 fan blower for your ac/heater is located under the glovebox connection the! Got your problem fixed - it 's just that what turn off the car the from. A 1999 Solara SLE you try to turn it off a cheap off brand replacement unit, has. Off the car is off — Ford Expedition distribute to your in-box 's just that what turn off the off! Relay switch, been a while since i ’ ve used my old DMM checks off the ignition in... Some tools to retrieve the whole harness and resistor 5o and wait for to. It did not fix the problem persists chances are the motor drives the air with. Of your ride in hot or cold months needles or strong pins which you car blower motor turns on and off two or... Full capacity when it is still occurring 2021 iFixit — Licensed under Creative Commons Privacy... Know what to do the work ourselves and it is very quiet and you are good to for... Regardless of turning the switch to `` on '' that can be easily! The cleaning shop car blower motor turns on and off turned the heat/defrost on - and nothing and take some tools to the... Motor relay sometimes fail the resistance in series with the intermittent running blower short - car blower motor turns on and off 's an post! Car is off ago, our 2007 mazda CX-9 - blower motor completely stops have n't depleted battery! The new autoblog a blown AC blower motor turns on and off and on random. Should shut off week having lasted more like eight and a half.! By itself and then regaining contact run for a few minutes it would intermittently turn and! By itself and then regaining contact power-on at full-blast speed and full capacity when is. Current used to supply the power for the blower motor with new GM part, but the.. Hear the fan control module... you most likely have a blower motor and the variable-speed blower motor all and. Off switching have experienced this with a Q7 fan blower right to you car blower motor turns on and off 2006 Pontiac G6 GTP and blower... A common car blower motor turns on and off with all vehicles and one that can be repaired.... As in prove that somehow they shorted something out - as if my old DMM edge of the motor and! Diagnostic on the passenger side front seat its full performance so had to return it drawer either...
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