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Old 09-05-2019, 04:12 PM   #1
UCSBTurbo
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Default 2016 impreza sport hvac blower intermittently dying

So my current issue is that when turning on the fan to any speed, sometimes it blows air and sometimes it does nothing. There are even times it will be blowing then turn off all of a sudden and come back on whenever it wants to.

I do hear a click in the passenger footwell when I turn the fan speed dial between off and auto which im assuming is the relay.

There are no issues with the ac/cooling system as I can crack open the sunroof and set the ac to outside air with the dial to full cold and it almost feels like the system is working normal. But with recirc mode there is no air movement at times.

I can only think of changing the relay and then the blower motor if that doesn't help. Any other things to look in to?

Thanks for any info.
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Old 09-05-2019, 07:07 PM   #2
Cougar4
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Swapping the relay is a logical first step for the trouble. You may even be able to swap it with another one in the car to see if that it the cause of the trouble. Try to check for voltage getting to the motor. The relay is usually on the hot side of the circuit and the speed control is usually on the return side of the circuit.
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Old 09-05-2019, 08:01 PM   #3
Gjkelley31
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Have you tried the blower motor resistor? Usually the first sign of this going is the fan speeds intermittently working. I had a Sebring that this was happening to and a quick resistor replacement fixed it perfectly.
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Old 09-06-2019, 01:55 AM   #4
UCSBTurbo
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Quote:
Originally Posted by Gjkelley31 View Post
Have you tried the blower motor resistor? Usually the first sign of this going is the fan speeds intermittently working. I had a Sebring that this was happening to and a quick resistor replacement fixed it perfectly.
I'll have to research that. I've never heard of that part before. Would that require disassembly of the blower itself?
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Old 09-06-2019, 05:16 AM   #5
Cougar4
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Blowers that have several speed selections use resistors in series with the motor to make the motor speed slow down to certain speeds. When the blower is on high speed then the motor is tied directly to the full power source to generate the highest air flow. There is another design type of speed controller that is a variable speed, and it uses a solid state controller in the same way to control the speed of the motor.
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Old 09-13-2019, 02:36 AM   #6
UCSBTurbo
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Default Update part 1

So I checked the voltage from the relay going to the blower motor. No matter what the fan speed setting (auto/low/high), the voltage stays at 1.9-2.0 volts. Is that enough voltage to the blower? It does go to 0 volts when I turn off the fan speed.
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Old 09-16-2019, 07:54 PM   #7
Angelus911
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I had an issue with my blower on my '12 Impreza, it would only turn on full blast or nothing at all. It was the resistor that sits by the blower. There should be a thread in the impreza forum that I posted my process
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Old 09-18-2019, 12:20 AM   #8
CosmoTheCat
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Without looking at a schematic, I am betting it's the electrical plug that goes into the back of the HVAC control head. It's probably melting.

I believe if you have an "auto" climate control system, you don't have a blower resister but rather a solid state thingamajiggy.
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