Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
Hello I will help you with your question,
Do you have a voltmeter to check the circuit if I guide you?
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.
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
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
Above the fuses, you will have to remove the panel under the steering wheel
No problem, I am running the valves on a Honda
What is the VIN?
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?
OK, then I guess that finding the blower relay is the trick. Is this car a US sold vehicle?
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.
All Sonatas with gas engines are made at the plant in Birmingham.
Your controls have no blower speed knob just up and down? It is automatic temperature control where you just set it?
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?
If you run power and ground to the motor does it run?
The 40 amp fuse has 12 volts to it?
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?
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?
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.