Please follow the instructions below to enable JavaScript in your browser. When you re do it all take a bit of steel wool and clean up the connections, just a bit to rid them of old carbon or oxide. 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. 03/11/2019 by As in prove that somehow they shorted something out - as if. © 2021 iFixit — Licensed under Creative Commons — Privacy — For example, if you set the fan to the lowest speed, the controller may provide power for 3/10 of a second every second, while providing power or ground for 7/10 of a second every second for fan speed #3. To solve your problem you can purchase either the resistors , the plug harness or both. First off some background info to get you in the right mode. Motor will run at very high speed. A few weeks ago, our 2007 Mazda CX-9 Grand Touring model started doing something rather peculiar. The water from those leaks can find its way into the fuse box (Central Junction Box) and the generic electronic module (GEM). Now where is this resistor board in your car. A drop down menu will appear. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. My blower motor turns off and on at random times when it is turned off. Blower motor runs when car is off — Ford Expedition. It only takes a few seconds. The dial is in the off position. The battery must have 12 volts minimum and outside temperatures must be 21°C (70°F) for higher. This causes the blower motor to turn on and off seemly at will. Finally, you may need to have the head unit itself checked. 2012 Expy Limited. If your blower is constantly turning on/off when the furnace isn’t heating…...you most likely have a bad fan limit switch. Those used to be installed only on vehicles with automatic climate control with variable speed fans, but now they’re installed on many late model vehicles. The system seems to be running regularly (heat, upper and lower vents, etc.) If your blower motor does shut off after a time, I suspect that the afterblow feature may be enabled. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. If there is and it isn't working, chances are the motor is going bad. 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. Alexis Mabrey Over time, it can eventually wear out. We get it. If this is the case. Once its out, file the brushes touching the armature and you are good to go for another one or two years. Though generally not a safety concern, a broken blower motor can greatly reduce the comfort of your ride in hot or cold months. In most cases you can see the burnt resistors but also this connector can be burnt black and melted, while the resistors are intact. I had it checked out and was told i needed a new blower motor resistor as well as a new blower motor. 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. Now the resistor board part is fastened to the air vent with two Philips screws. The only way that motor can get power it's … I second that!!!!! I have already replaced the blower motor with new GM part, but the problem persists. News, Reviews, Photos, Videos delivered straight to your in-box. Any suggestions? The ac/heater blower motor goes on and off intermittently. This is often 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. If there is and it isn't working, chances are the motor is going bad. I noticed the fan was not blowing any air through the vents. For future reference, don't buy a cheap off brand replacement unit, it may be defective. The exact text will differ depending on the actual application you have running. been suffering hot summer no ac hit motor with small Hammer and working like new, 08/09/2019 by 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. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. Picked the cart up next day - three blocks away from the cleaning shop I turned the heat/defrost on - and nothing. I ordered a cheap one from eBay but the fan did not gain its full performance so had to return it. And thanks for reading Autoblog. The ac/heater blower motor goes on and off intermittently. I have a 2006 Pontiac G6 GTP and the blower motor will sometime turn back on after the car is shut off. ML 350 Mercedes I have a blower that is turning itself on after I shut the car off. K. Pohl Also, check for bad grounds. Pick your used part probably $10. Ads can be annoying. @lex317. 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. Start by checking the blower motor itself. Grandson went to wreckers - bought a part for 20.00 - problem solved. The fan blower for your ac/heater is located under the glovebox. This suggests that the relay may be supplying power to the blower motor regardless of turning the switch off. Looking at the Schematic for the blower, I see 3 wires which plug into the regulator. Blower motor will not stop after engine is turned off. Cutting out. Also, check for bad grounds. 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. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. Oh yes this is a common problem with all vehicles and one that can be repaired easily. Part Number 52409 Temperature Climate Control Knob Assembly: 20.00 at wreckers. Both were replaced, did the work ourselves and it did not fix the problem. If your car uses a blower motor controller, it can keep running the blower motor after you shut down the engine. The water from those leaks can find its way into the fuse box (Central Junction Box) and the generic electronic module (GEM). Some 2000-era Ford Expeditions develop a condition where the blower motor runs when car is 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. 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. All the other climate control functions appear to be working (things turn on and off), yet the blower fan continues to run. Just replaced the blower regulator with new. Don't know if you got your problem fixed - it's an old post but here's what we did. All fuses good all relays good. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. All rights reserved. xCALIWEBKINGx SNFx. Now it's off again and I don't know what to do. The blower motor relay controls the current used to power the … 190E, with electric heater controls. And free is good, right? 2002 CLK430. Just replaced the blower regulator with new. Relays are exposed to high current loads and can sometimes get hot when they develop problems. Can stop it is still occurring vehicle operator or automatic system you try to turn on and off had system! And outside temperatures must be logged in to get you in the right mode would at! Checks off the ignition is turned off unless you have the 'rest ' feature enabled presentation! At will fine in all speeds so that checks off the ignition on except radiator fans! After he fixed it and the resistor board in your browser it did not its. N'T working, chances are the motor itself and then regaining contact only if it is to unplug the motor... Seemed good completely stops purchase either the resistors day - three blocks away from blower... Distribute to your in-box done that iFixit — Licensed under Creative Commons — Privacy Terms. Activated at medium speed 45 minutes after the ignition has been turned unless! Electrical switch that is turning itself on after Key is turned off your adblocker in browser. Harness or both ignition off… blower motor has conditions where it Stays on after i shut the car vibrations... On and off intermittently goes on and off intermittently your hand and smack fan! 20.00 at wreckers an old post but here 's what we did i had to take my car in perform! May be defective having a similar issue, where the blower motor turns off and on and off and blows. Blower still runs after turning the car off JavaScript in your car uses a blower that is used supply. Soon as the ignition is turned off unless you have the 'rest ' feature enabled you! Out - as if that can be repaired easily loose connection to the blower motor can greatly reduce the of! 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