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Discussion Starter #1
So at the end of my rope! I have an 04 Hyundai Elantra and when I turn on the heater/defrost it will not blow...I have checked all fuses and changed relays and resistor, even the blower motor and switch itself...still nothing. When I bypass the system and go with voltage straight to the motor it works. Could there be a fuse-able link I am missing or any suggestions on where a short could be or anything?
 

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I don't know your level of electrical troubleshooting
But, here is a description of the circuit involved
You can follow if you have a schematic?
Dash fuse 16 feeds (WHT/GRN) power to the blower relay on control side.
Blower switch then tells (GRN) relay to turn on
Relay takes power from engine compartment fusible link K (WHT/RED)
Comes from relay and goes to blower motor (WHT/BLU)
Blower motor then goes through resistors (switch) to ground
High mode for fan is a direct connection from the blower motor to ground.
 

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Discussion Starter #5
I don't know your level of electrical troubleshooting
But, here is a description of the circuit involved
You can follow if you have a schematic?
Dash fuse 16 feeds (WHT/GRN) power to the blower relay on control side.
Blower switch then tells (GRN) relay to turn on
Relay takes power from engine compartment fusible link K (WHT/RED)
Comes from relay and goes to blower motor (WHT/BLU)
Blower motor then goes through resistors (switch) to ground
High mode for fan is a direct connection from the blower motor to ground.
 

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Discussion Starter #6
I don't know your level of electrical troubleshooting
But, here is a description of the circuit involved
You can follow if you have a schematic?
Dash fuse 16 feeds (WHT/GRN) power to the blower relay on control side.
Blower switch then tells (GRN) relay to turn on
Relay takes power from engine compartment fusible link K (WHT/RED)
Comes from relay and goes to blower motor (WHT/BLU)
Blower motor then goes through resistors (switch) to ground
High mode for fan is a direct connection from the blower motor to ground.
That will be a tremendous help!!! 🙏🏻Thank you so much!
 

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Could there be a fuse-able link I am missing
I don't know if you missed it or not, but there is a BLOWER fuse link out on the engine bay fusebox.
And it's fuse 24 on the dash fusebox that powers the blower relay control circuit...see below :
443646
 

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I don't know how helpful that information will be.
Basically, look for blown fuses.
If all good then look for power going to blower motor
No power then check to see if there is power going to relay (engine bay fuse box)
Hyundai uses ground side switching (the switch connects the ground to complete the circuit)
If there is power (power on 2 of the 4 pins) then swap blower motor relay
Check to see if blower motor works.
If there is no power then trace which one has no power and why (wires)

Note: Grounds could be corroded and cause issues.

Good luck
 
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