Blower Motor Fan Only Works On High Speed? Plus - Tips To Prevent Repeat Failures!
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- čas přidán 8. 07. 2024
- Does your blower motor/fan only run on high speed...or not at all? In this video, we talk about the cause and effect that leads to blower motor resistor failure. Thanks for watching!
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As a Christian, I have felt the need to express gratitude for those professionals that make an effort to help others with their problems. I have viewed many how to's, but what makes this one stand out is that it covers everything in a concise video - better than reading a repair manual - thank you so much.
THIS IS INCREDIBLY HELPFUL THANK YOU!!!!
Thank you so much for this video on the blower fan resister. It was very helpful for me in diagnosing my problem and steered me in the right direction to find the right parts and getting them in.
This is the best description of what happened in my system. At low speeds, my 23 year-old blower motor would make groaning and squealing noises. Little did I know, just like he explained, this was an indication the bearings were drying up and causing the blower to draw additional power. Soon after this started all I could get was high speed. I changed both my blower motor and resistor and all is good again.
Thanks for the video. I was able to correctly diagnose my blower issue and replaced the blower motor and resistor on my own for around $115.
Wow now I don’t even have to look at my model specific video on why it’s failing. This explanation went above and beyond. I’ll have zero doubts moving into the repair.
Awesome! That's great to hear :)
Mike Becker, Senior Instructor
Super easy explanation very clear how/why/when everything works. Will of course start with filter, draw, clogged hose, then module to transistor in motor/and last motor itself! Thanks So Much! If i can't do it myself go in with a LOT OF Knowledge! Great Job/ Explanation! Great Job Thanks Again!
I'm glad you came up with this series because this is my next step with the old truck is the ventilation or whatever the proper terminology is. I've been doing this for 50yrs+ diy, parttime, weekend warrior, a mechanics worst nightmare, whatever you want to call it, it's my hobby and I'm very humble about it.
Thanks Ron, i'm glad it's helping you out. Being humble about it is what is key. You're not a mechanics worst nightmare if you're humble :)
Mike Becker, Senior Instructor
Thanks so much! i purchased an 07 Tacoma recently and this resistor is bad, it does not appear as if the cabin filter has ever been cleaned !! But thanks to you i will also check the blower motor before changing the resistor. this same part failed in my 07 Ford Freestyle and an OEM resistor was recomended by the DIY you tuber. He said after market resistors did not work for this part, but interestingly checking the blower motor wasn't mentioned, and there is no cabin filter in my Freestyle. thanks again, Subscribed 😍
Such an excellent presentation! Ty
thank you thank you ... good video i now have a better understanding of the HVAC system and its parts and function
Great tips, been there done that on my 05 chevy colorado. only had to do it once so far with 165,000 on the clock. thks and stay safe, we luv ur videos through the yrs
Hey Mrkt trdr, thanks for watching! :)
Mike Becker, Senior Instructor
I forgot to mention the advice you gave me on the evap system, you were dead on, thankyou. You bucks rule!
Hey Ron, awesome! Glad I could help :)
Mike Becker, Senior Instructor
Hey Mike, good to see you buddy and thanks for the video.
Hope everyone is healthy and safe.
Hey John, thanks for watching! Everyone's good here, hope the same for you!
Mike Becker, Senior Instructor
Great info and explanation! Thank you
Thank you for sharing this knowledge with us. The logical approach as to the root cause of the problem is very critical in the 3C. Concern, Cause and Correction = 3C.
Hey BlueDrive Diagnostics, thanks for watching! Finding the root cause is too often overlooked in this line of work. I always try to shed some light on that subject whenever I can.
Mike Becker, Senior Instructor
help of a professional mechanic .. finding a good mechanic, doctor and lawyer is very difficult in America ..👍🏻👍🏻👍🏻
It sure can be Arthur! Thanks for watching!
Mike Becker, Senior Instructor
Very helpful ! Thank`s
Nice synopsis of all the things not to overlook. I'll start with the cabin filters and the resistor and cross my fingers.
Excellent video with one slight error I believe?? By all means I welcome anyone challenging this but its my understanding that: ... clogged fans increase the speed of the motor but decrease the current draw. We see this on our home shop-vac vacuum cleaners when we block the air inlet the motor fan speed increases. Current draw on motors is closely tied to mass air flow which decreases with dirty filters. That said dirty filters can decrease the cooling of the blower motor and decrease the cooling of the current limiting resistor which I believe is a much greater issue with a clogged air filter. In other words the motor overheats due to poor ventilation from dirty filters which can prematurely kill the motor and resistor.
Great Video & Great Detail!
Have a 2004 Acura TL.
Blower motor fan stuck on high speed only when driving down road. Unable to turn it off at all.
The A/C also shut down at the same time.
After some digging I found that the resistor had failed (it had burn marks around some of the solder on the circuit board) which in turn caused the A/C to shut down (I assume for protection).
After buying a new motor resistor, the fan now works on all speeds and the A/C works again.
Not bad for $25 fix. Probably saved $500 or so. It did take me (a complete novice) about 5 hours to figure out, but worth it as I now have future knowledge.
Grat video, this was exactly what I was looking for!
Thank you👍
Thanks for the excellent information. Would it be more efficient to check whether the cabin air filter is clogged first?
Another excellent video,I tend to always check motor current draw before replacing a resistor especially when they are pricey. A lot of motors are highly inaccessible to check manually.
Very very true. Motor draw is a great test to ensure you don't smoke the new resistor!
Mike Becker, Senior Instructor
I was going to mention that.. I've watched a few dozen videos of troubleshooting blower motors/and resistors. A lot of them say that if the resistor fails soon after replacing.. that its most often the blower motor is over stressing and burning up the resistor.
Maybe the blower motor on this car was doing good physically.. but maybe the electrical plug on that blower motor was failing and putting stress on the resistor.
Could a few leaves really restrict the air flow so much that the resistor would fail after 1 month?
Hows his car doing now? Did it fail again?
Great Video. Straight to the point and super informative.
Thanks so much Eric!
~Mike
Thanks!
Hi Juan,
WOW! Thanks for the support!
Ryan Wilsing, Technical Instructor
Nice to see around Mike. Stay safe!
Hey Juergen, nice to hear from you! You as well :)
Mike Becker, Senior Instructor
thank you
Thanks for watching
~Mike
Nice job Mike glad to see you putting out some more videos. Appreciate you sharing
Hey Welding Junkie, thanks a ton!
Mike Becker, Senior Instructor
Fantastic video! very informative.
Good info as always Mike! 👍
Thanks Nick, great comment as always! :)
Nice job. Exactly what I was looking for. I'm now subcribed.
Thank U for the great advice!!
love the additional tips and thanks for your knowledge
Hey Dino, thanks for watching!
~Mike
Great Vid Man!!! To the Point and You addressed Exactly what I was thinking but wanted somewhat of a Confirmation, and You gave it to me!!! Very Knowledgeable Kid....... Keep it Up and God Bless-
You put out really good helpful videos. Thank you
Hey Cstar, thank you very much!
Mike Becker, Senior Instructor
Nice toolbox
excellent video, thanks for the info.
Thanks for watching Nikkita Bay!
Mike Becker, Senior Instructor
Great video... very informative...
Thanks Mike!!!
Mike Becker, Senior Instructor
Another great video!!! Thank you
Thanks Damian!!! :)
Mike Becker, Senior Instructor
Thxs Mike good info..
Thanks for watching Ed!
Mike Becker, Senior Instructor
Good video and information!
Hey Johnny, thanks!!!
Mike Becker, Senior Instructor
Great Video. Thanks
Hey Darren, thanks a ton!
Mike Becker, Senior Instructor
Good vid man!!!!
Keep up the good work
Stay safe Mike.
Thanks Jeremy, you as well!
Mike Becker, Senior Instructor
Saved me so much time. 🤙🤙🤙
Awesome Brad, glad we could help!!! :)
Mike Becker, Senior Instructor
Thank you Mike. Short class on Honda/Acura Blower Power Transistor testing would help allot of techs. How the control module sends analog voltage to the Mosfet to control the transistor. Show them the control signal, back probed and at all speeds. Then unplug the power transistor and show them the control signal voltage again at all speeds. This will help determine if the control unit is delivering the control voltage to the power transistor connector.
Have a blessed and safe week to you and your family.
Hey Billy, thanks for watching! Sounds like a fun video. Mosfets/blower controllers are a whole other animal. I will definitely tackle that at some point. Thanks for the tip!
Mike Becker, Senior Instructor
@@GoTechTraining haha - this video is just great! and covers the 99.9% perfectly. Thank you and only if resistor blows again within 20k miles or so - time for further checks.👍
Thanks.
Thanks for watching Manuel!
Mike Becker, Senior Instructor
Fantastic Video! I'm just curious to know if this similar process could apply also with my 07 Mustang Gt? Particularly because it's currently going through a similar, if not the same problem with the A/C
Only 1 speed? That blows. HAHAHHAAH. I will show myself out..
Hey Charles, you can have any speed, so long as it's high speed! Hope you and the family are doing well in these crazy times :)
Mike Becker, Senior Instructor
you funny bro, lol......
Làm cách nào kiểm tra quạt và lọc bụi máy lạnh xe astra holden 2006
Only works on high replacement how do I replace
Mine only works on high..kinda messed up huh?..thanks for video. The goofball at parts store said I needed $500 worth of new parts ..I'm tired of my damn windshield getting all the warm air...lol
years ago, it was common for a failing blower to cook the "high speed" relay, while the dinosaur resistor block (coils) would survive just fine (usually rust got them!) of course they was also under the hood mounted into the giant heat/ac box then.
now days opposite happens, the resistor circuit board or driver module cooks.... some great improvement there LOL
Haha maybe not improvements in overall longevity...but there are way fewer dash fires now, right?! ;)
Mike Becker, Senior Instructor
Grt video, I'm not as versed in using Amp clamp, can u hv video on Amp clamp testing, on a away of tools
Wow, this is the third company change I have seen on your videos, can you give us a run down on what is happening? Cool vid btw
Hey Jake, yeh I know...its frustrating. Hopefully we're good for a long while now. Thanks for sticking with us!
Mike Becker, Senior Instructor
Done deal brother thank you so much I didn’t want to buy $107 switch so I took it all the way apart and realize that it’s not that a resistor he says
Did you try cleaning the switch whith electric spray cleaner it's all mine needed I thot it was bad till I cleaned it whith the spray always clean the connecters and switches before you think it's a more expensive part
A great video wondering if you can lend a hand with your knowledge may she 35 blower is intermittent with no rhyme or reason to it the only thing I notice is if I shut the car off with the system running that when I turn it back on the blower will blow for a very short time and then stop blowing again! I have change the cabin filter and I'm wondering if it could be the relay. Your help would be appreciated as today it's -30 in Toronto. Thanks for the great video.
Grasias
You're welcome Martin!
Mike Becker, Senior Insturctor
Thank you for this video but my problem is a little different. I have a 1996 Toyota RAV4. The blower is on and off. I replaced the resistor. It didn't work right away (it actually started working the next day - on all levels). Took my RAV in to get an oil change and had my Mechanic check the blower itself and he said it was good. No air blowing on any level 2 days later. Tried the blower again the next day and the blower was working. Someone said it may be a bad ground or a bad switch or relay. Your input would be helpful. Thanks
I would have checked the current draw from the motor after the filter and resistor replacement just to be sure. Also, if the motor has a rubber hose connected to it's housing and the other end of the hose to HVAC housing, make sure that hose and the housing are not plugged up with trash, animal nest material or whatever was trying to make a home in the housing.
Great point Mike, I've seen spiders build webs/next inside those rubber hoses and plug them up.
Mike Becker, Senior Instructor
Hey great video. However, I have a different question. Why does my car AC only work on high speed every now and then? The majority of the time, the AC will work as it should but sometimes ( not very often..usually on longer drives) it will only work on high speed.. Please help
Hope you are well. Donald said it would disappear like a miracle. He didn't say at what cost though. Glad to see these new quick videos.
Also, seems like you've been getting quite a few parts from rock auto
Hey Manuel, thanks for watching! Glad you're enjoying the new quick vids!
Mike Becker, Senior Instructor
That's where I get my parts from..cheap ..well certain parts
How do I check the amp draw? Do you have a video showing how to do that? Thank you!
2011 E350 5.4
What if rear AC fan only works on low and medium not high
Thanks much
Great video but you should have shown before and after current readings of the blower motor. I've seen filters clogged and blower motor or resistor never failed.
Hey Jim, thank you. Yes, you're right. Watch for a video at 11am tomorrow(Friday).
Mike Becker, Senior Instructor
My 2017 Mazda CX-5 has 7 AC speeds and the first 3 vent almost no air. I already replaced the Blower control module since the car has automatic AC but did not solve the problem. After that I had the blower motor fan checked for obstruction from leaves and replaced the cabin filter but also this did not help. The AC air is cold it's just that the lower speeds vent almost no air. I also have a 2021 CX5 so I can compare the flow on each of the 7 speeds.
Very, very well explained however still to much for mine mechanical expertise.
Replaced blower motor in my 2004 Chevy astro,3 melted down resisters later I discovered the new blower motor was over amping new blower motor new resister 2 years later no problem
I have a 2009 ford f150 with dual automatic temperature control.
My blower motor speed module melted and quit working. Replaced it with a new aftermarket and it worked for a few minutes and stayed stuck on high speed and my compressor clutch won't engage now.
All the relays and fuses related to the AC system are good.
Could it be that the blower motor is causing the computer not to open the circuit for the compressor clutch?
Any help will be apreciated.
( I have replaced the blower motor speed control module with an OEM motorcraft from the dealership and I have all the speeds working now)
Also I have a new hig pressure switch or pressure transducer and a new evaporator temperature sensor.
The ambient air temperature sensor seems to be reading the temperature accurately and my compressor clutch looks fine and runs smoothly when jumped at the clutch relay.
Is it possible the damper located above the blower motor is dragging on the squirrel gage. I have a 07 Jeep Cherokee. Loud harmonic noise coming from the blower area at top speed. Found two mice (dead) in the squirrel gage.. Cleaned and replaced squirrel cage and noise continues. Any comment would be appreciated!
Thanks in advance.
Earl
My 2004 Camry AC blower suddenly stopped without warning. The dash panel control buttons light up - but no air output on ANY function. When I turn the power on ( without starting the car ) I can hear the clicking sounds behind the glove box. So, something is TRYING. But no air. I am going to check the air cabin filter. Also, with a shop vac, gonna try to reach down into the area and see if it's a twig / leaf / debris build-up that caused a clog or failure.
My fan on my 2003 ram 1500 has 4 speeds 1and 2 stopped working 3 and 4 still work. Would this be the same issue, and would I have a cabin air filter I can't seem to find anything on that?
Inhaler a 97 C1500 and have had to replace the fan control switch at leastb3 times in the last 2 years. Is this a know issue and could the resistor be the issue? I just know I am tired of replacing the switch. The fan was replaced a few years ago. Also when in the off position the fan can randomly kick on.
So i changed my resitor nd cabin air filter nd on high it blows good but when i put it on 1 2 3 it won’t blow strong i have to keep it on high in order to feel the air & my rear seats vents also
What if your vehicle doesn’t have a cabin air filter? (2014 f150)
I just got a new blower motor an it only blows on high could it be a bad resistor
Not all cars have a replaceable cabin filter like my 2002 intrepid doesn't. My blower only works on high and I'm going to replace the blower motor resistor 1st.
I just replaced my blower motor resistor and wire harness 2 days go it was working fine the first day the air was working fine on all settings then out of no where it just turns on when it’s on full max I don’t know what’s wrong and the parts i replaced are brand new?
Nice job buddy, what happy if my Blower only works on the lower speeds but NO HIGH SPEED?
Hey The World Moore, take a look at the wiring. Usually high-speed is run on a different wire or may bypass the resistor altogether.
Mike Becker, Senior Instructor
@@GoTechTraining Thank I have 12 Volts on both the power and ground of the Blower Motor. is the BLOWER MOTOR OR THE BLOWER MOTOR RELAY?
I’m getting up there in age, why did they start putting cabin air filters in vehicles? Was there a problem with leaves and dirt getting pulled in and causing issues? Thanks ahead of time
It is as you say: "Cabin air filters were only introduced in cars that were built after the year 2000. They prevent pollutants from entering the vehicle's cabin, as well as leaves, bugs and other debris from entering the heating, ventilating and air conditioning (HVAC) system."
Thanks for the video. I have a 2010 ford fusion and i replaced the resistor and the relay. The new relay came with 5 wires and the old one had 4. After hooking the new relay and resistor i only have high speed. Would that still be a blower issue or is the extra wire on the new relay causing the issue. Looking for any advice. Thanks!
Hey Obers13, are you sure you got the correct resistor? Did you buy the one for the automatic temp control and you have manual?
Mike Becker, Senior Instructor
The resistor said it was for 2010 for fusion. Not sure if there is a difference in the resistors for automatic climate control but my car doesn't have it.
Dude they say that when you really know your stuff you can explain it even to a dummy. You hit it right out the park. Thanks.
Mine is the exact opposite problem with my 2017 Crosstrek, 1 2 and 3 work but 4 turns the fan off
I own captiva. The blower only works on full speed too. I have checked the blower and threw in new resistor but cant solve the problem. What else could be the cause?
My F10 fan has a problem. When I turn the largest fan, the fan will run about 20 second and then stop. I need to turn off the fan , wait about 3 minutes and the fan will running again. I already changed the resistor but didn't fix. Do you have any suggestion? Thanks.
Replace resistor ,blower and fan switch still doesn't work on high any suggestions?
I have a similar issue, but a little different. In the past, I have replaced the fan switch due to it melting. However, this time the blower fan switch will work on all speed and then many time it won’t work at all. I pulled the switch and it doesn’t appear to have over heated. I check the connection to the blower and it is good. Any ideas as to what the issue is?
i have a problem my blower motor is on speed 5 but after a while slows down to 3 by itself. Then after a min speeds back up to 5. would this be the resistor or blower?
my problem is the opposite 1 to 3 works but 4 dont will the process be the same?
What would be the issue if I replaced the blower motor and the blower motor resistor?
Hey Adam, typically the only other things in the circuit are the fuse, wiring and control.
Mike Becker, Senior Instructor
What would cause my 2000 F150 the heater starts off blowing fine and then it fades out and gives off an odor
After repeatedly burning new resistors, I replaced my filter, blower and resistor, but it keeps burning my resistors at low speeds in like 10 minutes. My AC blows on high, but turns off my AC light and won't cool. I'm in Florida and really only turn on my AC on high anyways since it's a van with big open cargo area. I'd like to hardwire bypass my resistor since it's like the 3rd one I burn. I see the motor had a thick brown and orange cable going up into some harness. My resistor has thinner Brown, Blue, Black and yellow lines going back into where my switches are. How can can I get my A/C light to stay on when my fan is on high, it seems some relay or dependency on the resistor is causing this. BTW, the AC light turns on in speeds 1-3, but the fan won't blow. Again, a new resistor works great but gets really hot and burns out quickly on low.
Hello,
What year, make, model van do you drive?
On most vehicles the A/C light it related to compressor operation and can be inhibited by the vehicle for multiple reasons, A/C pressure issues, Check engine light, temp sensor malfunction. It is rarely tied to the blower resistor. But you may have some type of wiring issue causing it. Especially if you are burning up resistors.
~Ryan
@@GoTechTrainingThanks. 2018 Promaster city Van. I just bypassed my resistor and now I can at least get cold air on high.
I replaced the blower and resistor. Now it only blows on high when it worked on all settings before. What happened?
My 2010 mazda cx7 only works on speed 1,2, and 3. It won't work on high speed. I replaced the resistor, but that had no effect. Should i try replacing the motor?
Hello,
Looking at the wiring diagram, if the motor works on speeds 1,2,3,
I would start by check the blower switch and the blower switch connector.
I hope this helps you track down your issue
Ryan Wilsing
My high speed is not working..The plug on resistor is burnt and melted..Resistor and plug replacement..But..why did happen and how long will last..
The blower in my van must be wired straight to the battery, it squeals while running, sounds like it wants to seize up, previous owner jacked the wiring, trying to wire it straight to a power source, the dash switch was stuck.
What could it be ?
My 2 lower speeds of 4 would squeel.. Then by the end of the day those 2 lower settings stopped working all together.. Resistor or both? Idk
I’m sorry it’s a 2010 F150 the heater starts out blowing fine but within seconds it fades out and if I don’t cut it off it gives off an older