Car Ac Blower Motor Starts And Stops

When I switch the tstat to fan run, i hear a relay click and the blower motor trys to start, rumbles then spins down, rumbles then spins down, sometimes it is able to fully turn on and blows like normal for a few seconds and then cuts off and goes back to rubmling. This is one of the most common and easy ways to know if your air conditioner blower motor is broken or not. Automotive Blower Motor. Where there is a thermostatic switch in the circuit, start the car and let it run at fast idle. Simply open the glove compartment box of your Deville and you'll see the fuse. each time to start the car, the climate fan motors make loud noise and stay being noisy. New 2019 Ford Transit Connect, from Elder Ford in Troy, MI, 48083. I push all of - Buick 2002 LeSabre question. AC stopped blowing, but outside air still came in at HWY speeds cold. Many vehicle manufacturers use vacuum motors to operate heating/AC doors. or even blows with t. To get to the resistor, open your glove box, squeeze in both sides and. Alarm horn. 2 days ago · Policemen are confronted by demonstrators on a street during a protest in Hong Kong, Sunday, Aug. It's a little chilly out so I set the heat controls to heat and turn the blower on and then the RPMs drops down to almost wanting to stall the engine for a brief moment, then returns to normal. I wonder where the resistor is on my car. The outdoor AC compressor unit is constantly running but the indoor blower fan keeps stopping. Hi there Richard I am the gentleman that was enquiring about the class A H shape heater switch (from the United Kingdom) for my RV. You can attribute air conditioner rattling to one of several components. It started intermittently and has stopped functioning completely. 1) the problem occurs regardless of any settings. If I dare put the climate control thing back to life -> blower motor goes full blast and cannot be stopped unless I turn off the vehicle. If the fan is not working, these. In reality this condition renders the rest of the fan speeds inoperative, thus causing undue wear and tear on the auto parts involved, not to mention discomfort to the driver and passengers. Furnace is making a loud noise, awful furnace motor noise, furnace noise reduction, gas furnace noise like a slamming door that vibrates, heat pump making funny noise, when I turn on furnace sound strange, our boiler makes noises through the whole house and so on!. My wife just recently began experiencing an issue with her 2011 Jeep Grand Cherokee Laredo. Rating: blower motor start and stop. Here are some questions that may come up when selecting car and truck AC heater controls for your car. My air conditioner / fan stops blowing and then starts up after a moment or so, but the truck seems to be running fine, - Answered by a verified Chevy Mechanic. With no airflow through the radiator, it will soon warm up to the temperature at which the fan should cut in. Without the barrel fitted (no load on the output shaft) the motor turned no problem, then after around 20 seconds the motor slowed down and stopped completely over. My car's ac/heat isn't working, please help diagnose the problem. Humming can also indicate there are loose wires/hardware, or a blower motor issue. You know there's cold air happening somewhere inside that box, but with the AC fan not spinning, the air has no way of getting out of the box to cool you off. This will be something electrical, not an A/C problem. The blower motor is up under the dash on the passenger side typically, and usually the resistor is there too. manual or auto, heat or AC, any fan speed or air flow (floor, defrost. Comments: I'm reading your article HVAC Blower Fan and Regulator Replacement, and was wondering if this is related to my problem. A/C Parts House carries more than 1,200 new and remanufactured AC Compressors. I'm going to split this article into two parts: one part on heating, the other on AC. when the blower stops, the ac ices up and stops working or shuts down. Have the necessary tools for this DIY car blower motor project lined up before you start—you'll save time and frustration. Read on to learn about common A/C issues and stop by today! Your car's air conditioning is acting up, but you don't know what's wrong. Not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. My AC blower/fan stopped working. That may be a sign your heating and air conditioning system is failing. Condenser fan motor runs backwards. no need to remove glove box). I hope to become a regular. 0L L4 > Heat & Air Conditioning > Blower Motor Control Module / Resistor. Where may I be able to locate it and could it be some other problem? I noticed that from time to time the air would fluctuate on its own. A motor capacitor, such as a start capacitor or run capacitor (including a dual run capacitor) is an electrical capacitor that alters the current to one or more windings of a single phase AC induction motor to create a rotating magnetic field. Blower/Air Handler motor noise. 2) The highest speed does not work-it stays the same speed as the 3rd position. We do not recommend you go looking for the blower motor. Solution: Contact an A/C technician to check for any loose wires hardware and to make sure your blower motor is running smoothly. In a properly working air conditioner, a fan will draw air over the evaporator coils, where it is cooled, and then be re-circulated back into the room. Some sort of sensor turns off unnecessary stuff (like the compressor) to save it. inlet/ambient temp. Related Car Repair Articles and Products. I had to pull the passengers seat out, so I would have enough room to get down under the dash to remove the motor/fan. toyota Highlander 2003 03 SILVER V4 LK DVD low low miles, drive like new, cold AC, like new tires, 2 keys DVD and remote. The motor can be bench tested with a 5volt supply. If your air conditioning troubleshooting call is for a unit that has good supply voltage but is otherwise dead: If your supply power checks out ok, make sure the thermostat is turned on, that there is control power to it, and verify that it actually works. If your air conditioner is on, be sure to close your home's windows and outside doors. I have a 2003 GMC sonoma 2. Canuck, your blower needs power are you saying this blower turns on with the main ignition off or on? If when off you have an ignition main switch problem, and blower problem if when on you have a semi conductor problem with the blower control. Car heaters that don't blow at all. It continues to do this until I shut it off. This may appear too simple for words, but you would be amazed how many people will actually over react to a mechanical problem and run out and buy parts BEFORE they troubleshoot the problem. But if your car's heater suddenly stops working in the middle of winter, it can make it downright miserable. F10 40A** Heater blower motor F11 — Not used Fuses and Relays. Related Car Repair Articles and Products. Randomly, the Front Blower Motor will stop moving cold air. To fix your car's air conditioner, start by turning your car on and checking to see if the air conditioner is producing cold air. Been diagnosed 3-4 times with two different Ford repair facilities and not able to identify issue cause. How To Fix Your Squeaking/Screeching GM Blower Motor. A blower motor is a combination of a motor and a fan that forces air through the vents into the passenger cabin. blower motor acting weird. She will have the blower motor running and it will just quit, then cycle back on again maybe a moment or two later. Blower Motor Control Module 2 Answers. Sometimes i can get it to stay on in 4. Thermostat is set to 74F. ) If a blower motor breaks down, an HVAC professional can replace it for $400–$600, including parts and labor. Lifetime of an AC Motor. When a car is cold, the fan belt will squeal if it is loose. RV Air Conditioners and Parts plus 1000's of other RV parts and accessories for sale. Car For Sale - BMW 1 Series 2. Anaheim Automation AC Motors typically have a service life of about 10,000 operating hours, given the motors are operating under proper conditions, and in accordance to the specifications. So how can you stop it? Are you in the car and need to get rid of condensation right now?. I have tried replacing the FSU with a new one and it does the same thing. Is it the blower motor or is it something else? Any ideas?? Thanks. Yup check the fuse for the blower motor first. Blower Motor Control Module 2 Answers. Remove the mounting bolts that hold the a/c assembly and remove the parts one by one until you reach the blower motor. Edit: just saw you have the same car as me. My air conditioner / fan stops blowing and then starts up after a moment or so, but the truck seems to be running fine, - Answered by a verified Chevy Mechanic. Sometimes the blower motor stops running at this point. After waiting a minute, the fan would blow hard, then slow to a stop again. Anything from no air circulation to annoying or noisy operation. whether that's barely warmth mode then it perchance caught in a defrost mode, if it does it in the two senarios: 3. If it starts working it's most likely the motor or the pigtail connection. Chances are your RUN winding is out of order. Some of the things that can cause blower motor not to work include: Blower motor, blower motor wiring, connectors, relay, fuse, switch/control panel, blower motor resistor, blower motor module and Ignition switch. ) 2) The time it takes to start can vary from 30 seconds to 20 minutes). I've checked this site, but didn't find an answer. This is good and is the correct and expected test result that tells you that the blower motor resistor is OK and not the cause of the blower motor speed problem. A/C Freezing up? Silverado Car Forums it stops blowing cold and the air volume decreases. I have about 30,000 miles now and summer is just hitting and it's acting up. The squealing noise raises and lowers when I press the gas pedal which makes me think it is the AC pulley but I am looking for another suggestion. You can get a can of fan belt lubricant and squirt it on the fanbelt when the engine is cold. took me 2 hrs max. It will come back on again. Front blower periodically stops blowing. I’m guess it’s the blower motor. The fan blower for your ac/heater is located under the glovebox. The blower motor on my 2004 XC70 remains on after the ignition is turned off. I can turn it off and start again and it will work instantly but as soon it cools down I need warm up the engine, it used to work instantly even when outside was -20 celsius. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? 2. A faulty capacitor may prevent the blower from functioning at all. Alarm horn. When the blower motor suddenly stops switching on, the first thing that you must check is the fuse. It can be replaced (soldered in) with a part from Radio Shack for about $1. If this is an A/C in a car then one possibility is evaporator icing, which I have experienced in two different cars. I have a 1996 Camaro. In reality this condition renders the rest of the fan speeds inoperative, thus causing undue wear and tear on the auto parts involved, not to mention discomfort to the driver and passengers. The switch was in the off position and so were the temp controls. It turns out the cars thermostat was sticking, as the engine got hotter, the ac kicked out. i don't know how it can be connected to the brake could it be a vacuum leak in brakes please help. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG", for about 5 to 10 seconds and then all you hear is the outdoor condenser. I have a 2002 I35 that has an intermittent Blower Fan motor. Lifetime of an AC Motor. The blower keeps working after I hit the dash I turn the car off then the next time I start it (10 mins later) and the blower does not work I have to hit dash again. The blower would work at the various speeds but it would blow warm/hot air (probably just because it was hot in the car). Reasons Your Car Won't Heat | Heater Stopped Working Heat in automobiles is supplied by hot coolant circulating through the engine. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. The trouble relates to the blower motor and its activation. The contact mentioned that a burning odor emitted into the cabin. Verify if this light turns on when you reach MAX A/C. It starts fine in morning coming out of my garage but after being parked outside in the sun it shuts down shortly after starting the car. You plug it into the motor and hit a button, and it tells you if the motor is good or bad. The AC unit has been running a lot. But if your car’s heater suddenly stops working in the middle of winter, it can make it downright miserable. When I first start the car, the fan doesn't work. The switch was in the off position and so were the temp controls. When i drive my car, the AC works perfectly. 0L L4 > Heat & Air Conditioning > Blower Motor Control Module / Resistor. Tempstar runs for 2 minutes and starts over after blower stops, 3 blinks but then it restarts and reaches temp requested by thermostat. The blower motor could stop working again on longer roadtrips when the car is at a cruising speed and the electrical current of the motor drops again. air conditioning system – troubleshooting AC–22 Blower Resistor Air Inlet Servomotor Air out let Servomotor Blower Motor Condenser Fan Motor A/C Control Assembly A/C Amplifier Compressor Condenser Evaporator Magnet Clutch Receiver Expansion Valve (Replace) Wiring or Wiring Connection. Here is the scenario: Due to a slow leak in your system over a period of years, the pressure of the refrigerant gradually decrease. ) 2) The time it takes to start can vary from 30 seconds to 20 minutes). • Common on compressors and other hard starting equipment. Next time the blower wont work you can try giving the motor a whack with a hammer. And there's even a small chance that there might be a problem with the AC control head that sends the signal to the AC blower control module. Blower motor has nothing to do with the A/C. Most likely is the blower motor. Blower motor slows down when accelerating. The motor may start running; then try to disconnect it from the resistor and inspect it. I have a 2004 accord LX V6 with a J30A engine. The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage. 1) Your blower is getting bad, the motor starts out normal, as it get going the blower motor becomes hot and shut down 2) You have debris stuck in the blower fan, you need to locate the blower and clean the airway if it is clogged. Related Car Repair Articles and Products. Condenser fan motor runs backwards. My car's ac/heat isn't working, please help diagnose the problem. 5 seonds and stops, then starts again DC Motor only runs. See 100 other super simple car repairs you can do on your own and avoid a trip to the shop. Inside it is not getting cold. Bet you've thought about your car's air freshener far more often than your car's blower motor-one of those parts that some car owners realize they have only when it has broken down. I have tried replacing the FSU with a new one and it does the same thing. Randomly, the Front Blower Motor will stop moving cold air. toyota Highlander 2003 03 SILVER V4 LK DVD low low miles, drive like new, cold AC, like new tires, 2 keys DVD and remote. [ 2 Answers ] We have ~ 1991 Carrier 58sx high efficiency condensing furnace and central AC. You can attribute air conditioner rattling to one of several components. The AC unit has been running a lot. Getting to the blower, however, is a different story. I'm going to split this article into two parts: one part on heating, the other on AC. I did change the other parts out and the motor runs fine and all. Lastly, a malfunctioning heater core can leak coolant into the car and damage the blower motor and resistor as well. There are no causative events, it just stopped working. com for 95$. Then the final stage resistor and the blower motor. 2017 Bmw 4 Series 430i 2dr Coupe in Lexington near Lexington, IN, Louisville, KY. The first time the problem occurred, I thought immediately, it. That may be a sign your heating and air conditioning system is failing. To fix your car's air conditioner, start by turning your car on and checking to see if the air conditioner is producing cold air. ) If a blower motor breaks down, an HVAC professional can replace it for $400–$600, including parts and labor. The best setting for diagnosis is "fresh air" (not recirculated) with the air blowing out of the center vents in the dash and the AC turned on. Without a functioning blower motor your engine runs the risk of overheating. I replaced the blower motor and it still did not turn on, when 12v was applied to the blower fan directly it worked fine. If either one of these components fails to do their job, it may result an entire system failure. Question: AC Unit comes on for short time and clicks off and then back on and then off again. Even Carrier products can have problems, and Carrier air conditioning troubleshooting is required. It's running for 2 minutes, turns off for another 2, then turns on again. The only way I can stop the fan is if I turn the vehicle off, then press OFF then restart the vehicle. You get in, start the engine, turn up the heat control, and adjust the fan speed to medium and to your surpriseno air is coming from the defroster vents. To confirm the condition of the fuse, you have to take a look at it. If the Start Capacitor fails the motor will most likely not turn on. When I picked up the car the AC worked great, it was a short drive home so I didn't notice the problem. If I dare put the climate control thing back to life -> blower motor goes full blast and cannot be stopped unless I turn off the vehicle. The AC will start out the day working great! Cold air blows out it will run for an hour or two and before it gets to temp the blower motor shuts off while the compressor continues to run. It's a little chilly out so I set the heat controls to heat and turn the blower on and then the RPMs drops down to almost wanting to stall the engine for a brief moment, then returns to normal. This helps the compressor when it is running, however, very few HVAC compressors come with a start capacitor. I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). Then in about 15 min. Anaheim Automation AC Motors typically have a service life of about 10,000 operating hours, given the motors are operating under proper conditions, and in accordance to the specifications. Each time the system starts a cooling cycle, many. Is starting your car with the A/C on bad? Older cars will disengage the AC during start simply because the voltage drop from running the starter motor makes the. Tempstar runs for 2 minutes and starts over after blower stops, 3 blinks but then it restarts and reaches temp requested by thermostat. Your car's blower motor is not only necessary for the operation of your air conditioner. Is it just the blower that is intermittent or is the AC compressor engaging also intermittent? 2. Turn key to start the engine. Remove the two screws that hold the motor located at your left. Location and how to instructions on the Blower Motor Control Module For those Denali/GMC owerners that are curious if your front ac blower stops working or runs at low speed. There were a few DIY's for the older cars on how to remove the blower motor that helped get me going and the good news is the MKVI's seem to be much easier in comparison (i. removing or replacing connectors, servicing the motor, removing the high voltage plug, and before reconnecting. when the blower stops, the ac ices up and stops working or shuts down. All fuses good all relays good. On a right hand drive car one can remove the instrument binnacle (glove box on LHD car) and see and strike the upper motor easily. A popular strategy for AC induction motor control is the use of variable frequency drive units, or VFDs. The most common cause of window air conditioners not blowing cold air is a lack of adequate air flow. A/C Freezing up? Silverado Car Forums it stops blowing cold and the air volume decreases. Thanks for any advice Mark. Warm air from inside the car meets the cold windscreen and turns water vapour into actual water. then I would drop the blower motor and inspect for the fan to be. Check out what he's been through, and why he should have asked an expert from the start. I took the cover off I see that the blower motor itself is a ways away from where I hit the dash. However, the part numbers listed above are not applicable to cars with EATC or ATC climate control systems. So, some time ago I swapped out my '73's original heater blower motor for a Fiero motor and squirrel cage, along with a 3-speed fan switch. My car heater fan keeps going out. If this is an A/C in a car then one possibility is evaporator icing, which I have experienced in two different cars. 1) the problem occurs regardless of any settings. Many vehicle manufacturers use vacuum motors to operate heating/AC doors. A/c and blower stop completely; then comes back on again. If it isn't seized, check the control voltage on the relay that controls it. Comments: I'm reading your article HVAC Blower Fan and Regulator Replacement, and was wondering if this is related to my problem. The first time the problem occurred, I thought immediately, it. New 2019 Toyota Camry XSE for sale - only $32,408. When a car heater doesn't blow at all, the problem is either a bad blower motor or something preventing power from getting to the blower. Old car air conditioning can be difficult to fix. manual or auto, heat or AC, any fan speed or air flow (floor, defrost. Fortunately, a replacement blower motor can be wired in to correct the issue and restore heat to your home. Fortunately, a replacement blower motor can be wired in to correct the issue and restore heat to your home. The car was at O’Regan’s Mercedes-Benz from 9:30 to the time the repair was completed, under warranty, at 4:00 this afternoon. She will have the blower motor running and it will just quit, then cycle back on again maybe a moment or two later. Consider that the purpose of gas furnace is to warm the home, and realize that it is the blower motor that actually takes that heat and directs it from the very isolated, insulated furnace and in to the actual. My shop is on the other side of the wall down in the basement, so I spend a lot of time listening to this blower motor. Thanks Wayne J. Chances are your RUN winding is out of order. If you can freely turn the white. If your fan belt isn't tight enough, it can also slip off its pulley track and cause the fan to stop working properly. If the fuse looks good, move on to the blower inside the car. AC stopped blowing, but outside air still came in at HWY speeds cold. My problem is on a 1996 Dodge Caravan 3. WARNING Disconnect AC power from the system and make sure the blower wheel or fan blade has come to a complete stop before servicing the motor. A/C question: My outside unit runs, but no air is being pushed through the vents in the house. The key here is no air blowing. Can I replace a blower motor resistor myself?. You can hear the compressor working. There are a couple of tools out there [for testing motors], like the TECMate [from Genteq]. Blower starts and stops, goodman air handler aspf313716aa. In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes the blower motor stops running at this point. Traditional bearing shells with aluminum or copper lining show severe wear after only 100,000 cycles. Blower Motor Control Module 2 Answers. This is NOT a new car! All buyers have different perceptions of condition. The concept is simple enough -- if you. I can hear the blower blowing the air, but nothing really comes through the vents. And no air blowing with no blower noise. And, when your windows are fogged over, having fully functioning AC speeds up defrost time. Two days ago, sunny, 15 degrees Celsius, hot in the car, tried the AC in my 2001 Jetta with 397,000 km for a few minutes. Before you start troubleshooting the AC, you'll want to make sure that the outside temperature is above forty degrees. If your heater motor won't come on, first check your fuse or relay. The first time the problem occurred, I thought immediately, it was the blower motor transistor, so I replaced it, as well as the cabin air filter. Re: blower motor keeps running whether car is on or off Post by mrbrian200 » 19 Nov 2017, 19:37 I'm not expressly familiar with the inner workings of the electrical portion of the ignition switch, however, when I first bought my S60 after it had been basically sitting for the better part of six months I noticed something in the ignition switch. A blower motor is a combination of a motor and a fan that forces air through the vents into the passenger cabin. Its speed is controlled by a resistor. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesn’t work, or only works on high speed, etc. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. smart fortwo Electrical Problems See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. Yup check the fuse for the blower motor first. Sounds like the front blower motor is starting to fail. The compressor motors need the extra power to start. If your blower motor slows down when accelerating, it may have nothing to do with the motor itself. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. [ 2 Answers ] We have ~ 1991 Carrier 58sx high efficiency condensing furnace and central AC. And there's even a small chance that there might be a problem with the AC control head that sends the signal to the AC blower control module. My home A/C blower motor runs for a few hours, then will not start again after reaching set temperature. Verify if this light turns on when you reach MAX A/C. Dodge Vehicles with Melted Blower Resistors. I replaced the motor and resistor already. I'm going to split this article into two parts: one part on heating, the other on AC. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. It continues to do this until I shut it off. The 2006 Chevrolet Silverado has 18 problems reported for blower fan stops working sometimes. This is a discussion on blower motor acting weird within the Dodge Dart Electrical Problems forums, part of the Dodge Dart Forum - Pit Row category; i was wondering if anyone else has come ac-crossed this issue. My AC blower/fan stopped working. I shut off the AC then put the blower on max and noticed it slow to a complete stop. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. I have a new blower motor, interior fan switch, resistor, and AC components. If the Start Capacitor fails the motor will most likely not turn on. See CAPACITORS for HARD STARTING MOTORS. Today - as i stood with the car somewhere and let the engine run (idled) - i noticed strange noises from the front: The AC - compressor runs and stops after maybe 1 - 2 seconds. I thought that was it. I have 2007 Civic 4dr with an A/C blower motor that works only part of the time. Anything from no air circulation to annoying or noisy operation. Whenever it starts to work, the motor seems starting nicely, however, I would hear the air blower has this. My blower motor did. The blower motor resistor pack has a thermal fuse which can blow. Loud humming. the FAQ's on COMPRESSOR / CONDENSER FANS. A popular strategy for AC induction motor control is the use of variable frequency drive units, or VFDs. I have followed everything that is said on this thread and everything is fine. All the time. issue with our AC. Even Carrier products can have problems, and Carrier air conditioning troubleshooting is required. When i use my AC randomly i will get no air out of the vents, it seems to happen at all speeds of the blower motor. The small diode feeds the blower motor voltage back to the AC computer, and has steel leads which corrode away, breaking the connection and preventing speed control from working. The blower motor resistor pack has a thermal fuse which can blow. the air conditioner stops working. The blower motor is located below the glove box. Central air conditioning systems include an indoor evaporator unit and air handler as well as a large outdoor unit that contains the compressor. 6 Amps, Totally Enclosed, Reversible Rotation, Ball Bearing 3. In most cases, a blower motor resistor fails due to corrosion or overheating. Rear A/C controls continue to work fine and cold air is blowing out well. Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by zephead, Sep 4, 2015. So, some time ago I swapped out my '73's original heater blower motor for a Fiero motor and squirrel cage, along with a 3-speed fan switch. 20 Seconds is the give away here, telling me you have a single phase motor. All fuses good all relays good. So I cut out the blower motor and hooked it up to a battery to see if it would work and it fired right up. (Common Problem-- '99 to 04 Cherokee) In the Cherokees with ATC ( some call it: AZC - Auto Zone Control) The PROBLEM IS THIS: With the ATC System -- The CONNECTOR on the Blower Motor Control Module-- OVERHEATS Resulting in Intermittent OR NO Operation of the Blower Motor!. This will be something electrical, not an A/C problem. run the indoor blower motor. There are no causative events, it just stopped working. Common Air Conditioner Capacitor Failure Symptoms. So, here goes. photos by Randy Mullins [Randy wrote me a note thanking me for my article about the blower motor replacement - thanks Randy! He fixed his blower motor instead of replacing it. If you can freely turn the white. We are camped at a commercial campground and it is very hot. It’s an ages-old debate: does it do any good to run your blower fan in your home without turning on the air conditioner itself? While it may make sense since it helps to circulate air and keep things from getting stuffy, it may actually be costing you more money in the end. Your blower motor is typically located on the passenger side of the vehicle under the dash. Start with the fan speed turned to its highest setting. What causes the noise: Humming usually means your air conditioner has an electrical problem, similar to what causes a buzzing sound. Next time the blower wont work you can try giving the motor a whack with a hammer. I have a 1997 Chevy Blazer 4.