Blower Motor Problems
The blower motor is really the heart of the HVAC system. Without it, you don’t have airflow in the system. If your blower motor goes out, you won’t have heat or AC. So if you turn on your HVAC and you don’t hear anything, you might start by checking out the blower motor operation. Blower motor circuits are often similar in design. You have the motor itself, a switch to run it, and some form of resistor or transistor assembly that controls the blower speed. If you study the problem, it can tell you a lot about what might be wrong. When the blower is on high, it’s getting full battery voltage so it can run at full speed. If you select some other speed, the current flows through a resistor or transistor assembly that takes away some of the feed voltage. If the blower receives less voltage, it will run slower.
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With this in mind, if your blower only works on high speed, what do you think the problem might be? That’s right: the blower resistor or transistor. It’s a common problem and many times is easy to fix. The transistor or resistor assembly is often mounted in the HVAC system and is accessible from the outside. If the blower doesn’t work at all, try tapping the outside of it with the palm of your hand. This might cause the motor to start working. If this is the case, you likely have a bad blower motor or a loose connection somewhere. My money is on a bad blower motor; they do wear out from time to time.
It’s also a good idea to check for power and ground at the motor first before you replace it. It could be some other issue that causes it not to work, as you’ll see in this video.
3 thoughts on “Blower Motor Problems”
Jason K
March 28, 2023 at 5:02 pm
2006 Acura TL base, no navi… I replaced both the fan motor and resistor pack. Was very easy per your instructions – thank you. New resistor pack popped and smoked. I replace resistor pack again checking for melted wires and shorts (saw none). Second resistor also blew. Suggestions? I suspect either an overvoltage or a short but where to measure to confirm this? Thank you.
Patrick Carrillo
June 10, 2021 at 2:03 pm
Hey Eric I got a question for you I have a 2007 Acura TL Type S pretty much identical to yours I’m having problem with my AC blower motor where it just won’t turn on at all The compressor won’t kick on and the blower motor itself won’t kick on No heat no AC No defrost nothing And the thing is it’s intermittent sometimes it won’t work and then I’ll be driving around on the road and all of a sudden it’ll just kick on I replaced All the fuses In the fuse box and inside the cab All 5 relays and the resistor Same thing I have a new blower motor coming in but I’m not sure if that’s the problem I would just like to ask what would be the problem would it be a pinched wire somewhere would it be the blower motor itself i just don’t know I’m pretty stumped on this
Thanks
Patrick
Brandon Hogue
February 26, 2020 at 2:02 am
Hey Eric,
I’m having an issue where I’m only getting heat when I have the temp. switch set to the maximum heat. My fan switch works fine in all modes. I have replaced the resistor, but it did not fix it. Any ideas?