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Heater will not blow air

Tiny
JENNY79
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • AUTOMATIC
  • 225,000 MILES
I have changed the blower motor and resistor he would not work. Next day it start blowing and working. Two weeks later again it stop blowing. Won’t work on any settings but when you cut it on you can hear it turn over but won’t blow.
Wednesday, January 15th, 2020 AT 11:17 AM

18 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I attached a diagram for you to view.

Check the red wire to the resistor for power with the key on when the system does not work.

Trying to narrow the area of failure for it not working.

Roy
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Wednesday, January 15th, 2020 AT 2:51 PM
Tiny
JENNY79
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  • 10 POSTS
I went and moved the wires around nothing still. Also check the connection and everything seem to be together. But it does work for a week and then stops working. I really don’t know that much about cars but what I can research and watch videos to fix on YouTube.
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Wednesday, January 15th, 2020 AT 6:45 PM
Tiny
ASEMASTER6371
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Okay, you need to check the voltage like I explained to see if power is available for the system to work.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Roy
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Thursday, January 16th, 2020 AT 1:32 AM
Tiny
JENNY79
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  • 10 POSTS
Okay, I have to go get a tester. Will be trying later today.
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Thursday, January 16th, 2020 AT 5:22 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Sounds good.

Keep me updated.

Roy
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Thursday, January 16th, 2020 AT 5:24 AM
Tiny
JENNY79
  • MEMBER
  • 10 POSTS
Tested the wires to the blower motor and resistor and no power is going to either.
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Thursday, January 16th, 2020 AT 6:50 PM
Tiny
JENNY79
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  • 10 POSTS
Tested the wires to the blower motor and resistor and no power is going to either
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Thursday, January 16th, 2020 AT 6:50 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Check the blower fuse I listed on the diagram for power. That is what feeds the red wire to the resistor.

Roy
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Thursday, January 16th, 2020 AT 7:04 PM
Tiny
JENNY79
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  • 10 POSTS
That’s good.
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Friday, January 17th, 2020 AT 10:05 AM
Tiny
ASEMASTER6371
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Did you check for voltage at the fuse? This is not a visual test, it is a voltage test at the fuse.

https://www.2carpros.com/articles/how-a-car-fuse-works

Roy
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Friday, January 17th, 2020 AT 11:21 AM
Tiny
JENNY79
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  • 10 POSTS
I used the light up stick thing and it did light up. So I should take them all out 1 by 1? Sorry if I sound crazy really don’t know about cars.
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Friday, January 17th, 2020 AT 12:34 PM
Tiny
ASEMASTER6371
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It should have voltage on both sides with the fuse installed.

If it does, then the wire is open between there and the resistor.

Roy
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Friday, January 17th, 2020 AT 12:37 PM
Tiny
JENNY79
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  • 10 POSTS
How can a chase it or can I make my own ground and connect it to the blower motor or resistor?
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Friday, January 17th, 2020 AT 12:51 PM
Tiny
ASEMASTER6371
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It is not a ground. It is a power wire.

Somewhere in the harness, there is an open. Where is a good question?

As far as running another wire, you could do that. You could run a wire from that fuse to the resistor and see if it powers up the motor.

Roy
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Friday, January 17th, 2020 AT 1:03 PM
Tiny
JENNY79
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Okay, but to connect it to the motor would it be the red or purple I connect it to?
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Friday, January 17th, 2020 AT 1:06 PM
Tiny
ASEMASTER6371
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No, it needs to go the red wire at the resistor. That is the wire with the issue.

Roy
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Friday, January 17th, 2020 AT 1:11 PM
Tiny
JENNY79
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Okay. I’m going to try it and see.
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Friday, January 17th, 2020 AT 1:13 PM
Tiny
ASEMASTER6371
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Keep me updated.

Roy
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Friday, January 17th, 2020 AT 1:18 PM

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