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George H.
George H., Hyundai Technician
Category: Hyundai
Satisfied Customers: 18387
Experience:  Hyundai Gold certified, ASE Master tech 15+ years
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I have a 2007 Hyundai Sonata Limited 3.3 v6 with auto a/c.

Customer Question

I have a 2007 Hyundai Sonata Limited 3.3 v6 with auto a/c. Blower will not work
Submitted: 1 year ago.
Category: Hyundai
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

Do you have a voltmeter to check the circuit if I guide you?

Customer: replied 1 year ago.
Customer: replied 1 year ago.
Let's do this I'm ready
Expert:  George H. replied 1 year ago.

Good, access the power transistor near the blower motor in the bottom of the blower case on the right hand side of the dash, unplug it and measure between the pink and the black wire in the connector, if it shows 12 volts then plug it in and slip a straight pin along the blue wire to make contact inside the connector. Put the other lead of the meter to a good ground. Change the blower speed and see if the voltage changes. If it does but a few volts then replace that transistor.

Let me know what you find, if that does not check out we can move on to other testing but it is the most common.

Thank you

Customer: replied 1 year ago.
It shows 8.4 volts when I unplug and measure between pink and black wire
Customer: replied 1 year ago.
Sorry it is .8 volts not 8.4
Expert:  George H. replied 1 year ago.

Sorry, was that with the key on? If not please remeasure and if it was check the EPS fuse in the underdash fuse block and the large 40 amp blower fuse in the underhood fuse block.

Let me know what you find

Thank you

Customer: replied 1 year ago.
that was with the switch on. The 10amp ac control module outside mirror and mirror folding fuse under dash is not getting power. Fuse number 36 The other ac control module fuse under dash is good fuse number 12. Checked the 40 amp under hood and it is good
Customer: replied 1 year ago.
This is pics
Customer: replied 1 year ago.
More pics
Customer: replied 1 year ago.
But power mirrors work
Expert:  George H. replied 1 year ago.

What about the #4 EPS fuse?

That and the 40 amp feed the blower relay. #4 should come hot when you turn the key on.

If those both have power pull the blower relay and check that you have 12 volts to two of the relay pin sockets

Customer: replied 1 year ago.
Where is the blower relay located
Expert:  George H. replied 1 year ago.

Click here

Above the fuses, you will have to remove the panel under the steering wheel

Customer: replied 1 year ago.
K give me just a few minutes. Taking panel off now
Expert:  George H. replied 1 year ago.

No problem, I am running the valves on a Honda

Customer: replied 1 year ago.
Ok above fuses this is what it looks like above fuses
Customer: replied 1 year ago.
There is nothing there
Expert:  George H. replied 1 year ago.

What is the VIN?

Customer: replied 1 year ago.
5NPEU46F87H176966
Expert:  George H. replied 1 year ago.

No help there, I don't know why I would have a diagram showing the fuse panel but nothing there. I checked an '08 and the same thing.

Do you have power at both testpoints on the EPS fuse with the key on?

Customer: replied 1 year ago.
12volts on both sides
Expert:  George H. replied 1 year ago.

OK, then I guess that finding the blower relay is the trick. Is this car a US sold vehicle?

Customer: replied 1 year ago.
I have talked to about 50 people today and everyone keeps saying this year and make does not have a blower relay but Hilton book shows it does
Customer: replied 1 year ago.
Chilton book
Customer: replied 1 year ago.
I don't know I just bought it how do I find out
Customer: replied 1 year ago.
I figured out problem it was made in Alabama lol
Expert:  George H. replied 1 year ago.

The Hyundai wiring diagrams certainly show it. I think what they are saying is that it does not have a blower resistor, they are correct there.

The underhood sticker should have emission information and reference that it is 50 state compliant if it is US.

Expert:  George H. replied 1 year ago.

All Sonatas with gas engines are made at the plant in Birmingham.

Customer: replied 1 year ago.
It says usa
Expert:  George H. replied 1 year ago.

Your controls have no blower speed knob just up and down? It is automatic temperature control where you just set it?

Expert:  George H. replied 1 year ago.

I have a diagram for the manual system that shows the relay up by the blower motor. What do you find if you follow the wire harness from the transistor and the motor?

Customer: replied 1 year ago.
automatic with cabin filter gets cold just blower won't work
Customer: replied 1 year ago.
This is the ac untit
Customer: replied 1 year ago.
From the transistor the pink wire goes to to the blower the black wire and the blue wire from the transistor goes to under dash on passenger side. The pink wire from blower and yellow wire from blower also goes up underneath the dash to a harness
Customer: replied 1 year ago.
This is the harness
Customer: replied 1 year ago.
This is what it looks like by fuse box
Customer: replied 1 year ago.
This is also under dash
Expert:  George H. replied 1 year ago.

If you run power and ground to the motor does it run?

Expert:  George H. replied 1 year ago.

The 40 amp fuse has 12 volts to it?

Customer: replied 1 year ago.
it does run straight wired
Expert:  George H. replied 1 year ago.

Do you have 12 volts at the yellow wire?

Any evidence of burning or melting of the connections?

If you put one lead of the meter to a good ground such as the bolts in front of the door opening do you get 12 volts then at either the pink or yellow wire?

Customer: replied 1 year ago.
the 49 amp is 12 volt no signs of burning nothing on yellow or pink wure
Customer: replied 1 year ago.
Both yellow and pink wire have no volts
Customer: replied 1 year ago.
Transistor is showing good
Customer: replied 1 year ago.
We even bought this and replaced it
Expert:  George H. replied 1 year ago.

If the blower relay is not closing then you will have 12 volts at the fuse but nothing at the motor.

Is this car rebuilt? Is the title clean or salvage?

Customer: replied 1 year ago.
Not rebuilt clean title. Very clean one owner never been wrecked elderly lady had it. I still can't find the relay
Customer: replied 1 year ago.
I think it is relay just can't find it
Expert:  George H. replied 1 year ago.

I agree that it is between the fuse and the motor and there is supposed to be a relay as shown. Without being there I cannot go further on this. I would have to trace the harness to see what happened to it.

I don't think I can help you further so I will OPT OUT of your question and maybe one of the other techs will be able to shed some light on this.

Sorry we did not get to a conclusion.

Customer: replied 1 year ago.
K thanks so much for your help.