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HELP! Blower Fan quit working

Tiny
VITAMIXER
  • MEMBER
  • 2005 KIA AMANTI
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 65,000 MILES
It stopped working one day. A week later it worked again at all speeds for a couple days and then stopped again (at all speeds, even high). I unplugged the power plug to the blower motor and tested the motor with jumper cables and it spun fine. When I put the the fan to 'high' I can hear the high relay click so I don't know if that's what it's supposed to do. I unplugged the power transistor plug and tested the voltage with a multimeter. The voltage readings were about half of what the manual said they were supposed to be, but there were voltage changes. I checked the continuity of the blower transistor and there were no readings at all. I heard the the blower transistor only controls the low speeds. But the high speed doesn't work either. Fuses are not blown. Is it the high relay, the blower power transistor or something else? Also, while I was testing the blower, the fan worked at all speeds again until I turned the motor off and restarted it. Then nothing. Please help!

P.S. Air conditioner works fine.
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Tuesday, September 21st, 2010 AT 10:42 AM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,716 POSTS
Hello,

There is a blower motor relay that is out here are the blower motor and air conditioner wiring diagrams so you can see how the system works and a guide on how to test the relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here is the blower relay and fuse locations

Check out the diagrams (Below)

Please let us know what happens.

Cheers
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Wednesday, October 13th, 2010 AT 12:14 PM
Tiny
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Replaced the resistor. Nothing. Could a bad high relay cause the lower speeds not to work? When I switch to the high speed, I hear a click from the relay so I assume it's working. What else could cause this?
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Wednesday, October 20th, 2010 AT 9:55 AM
Tiny
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  • MECHANIC
  • 109,716 POSTS
Just because the relay clicks does not mean it is working, did you try removing the relay and jumping it using a wire?
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Wednesday, October 20th, 2010 AT 10:19 AM
Tiny
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That's the only thing I haven't done yet. The unit powers up and everything but I haven't pulled the unit out to check to see if power is coming into or going out of the unit. There are voltage changes @ the resistor so I assumed that power was coming out of the unit.
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Wednesday, October 20th, 2010 AT 10:31 AM
Tiny
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  • MECHANIC
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Is there power to the resistor?
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Wednesday, October 20th, 2010 AT 10:38 AM
Tiny
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Yes.
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Wednesday, October 20th, 2010 AT 10:41 AM
Tiny
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If you have power to the resister, then it has to be getting to the motor. Did you check that?
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Wednesday, October 20th, 2010 AT 10:59 AM
Tiny
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No power to the motor. The voltage readings to the resistor are about half of what the manual says it should be at each speed. Just in case I jumped the motor from the battery and it spun fine. Is there something between the resistor and the motor?
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Wednesday, October 20th, 2010 AT 11:06 AM
Tiny
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  • MECHANIC
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I believe there is a relay. Check under the hood for the relay block and see if you can locate it.

Let me know.

Also, I'm a little confused. The resister is what changes the fan speed. The inside switch just sends power to different connectors on the resister. The power should remain consistant and change based on which section of the resister the power is sent to.

Let me know what you find. Also, let me know if there is 12 volts to the switch on the dash.
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Wednesday, October 20th, 2010 AT 11:16 AM
Tiny
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Kia calls it a 'power transistor' There are only 3 pins on the plug that plugs into the transistor. I was told to check the voltage between pin 1 and pin 2 and that's where I got the different voltage readings based on the speed on the dash. We maybe talking about two different things. I know the hi-relay is getting something because it 'clicks' when I put it on high speed, but no power to the motor. Would the relay 'click' if it weren't getting power?
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Wednesday, October 20th, 2010 AT 11:39 AM
Tiny
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I would say no.
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Wednesday, October 20th, 2010 AT 11:43 AM
Tiny
WCAP JONES
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  • 1 POST
I have 2004 Kia Amanti been experiencing the same problems with the blower motor for the air condition I have change the relay on the passenger side and also the resistor also ran jumper wires to the blower motor and it ran fine at high speed. So I replaced the HVAC module which is where the power goes through and that fixed the problem I got a used one and installed it for $150.00. Just thought you guys should know.
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Sunday, July 17th, 2016 AT 8:01 PM

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