Hello....First post on here.
I have a 2004 Elantra. The blower for heat/ac not working.
I did all of this:
Checked interior fuses, all OK.
Checked 30 amp fuse in engine compartment, put a new one in.
Pulled blower motor out and tested with a 12V power supply: worked fine.
Replaced Blower Relay
Replaced Blower Resistor
all of this and still no blower.
The heater control panel on the dash has 3 knobs.
When I turn the first to AC...the light comes on and I hear the AC kick in.
2nd knob is blower fan...nothing on any setting.
3rd knob...hot and cold...not sure since no blower.
I am lost at what to do next.
Any suggestions would be greatly appreciated.
You tested the blower motor with a 12 volt supply.
Now see if the blower motor gets 12 volts while in place.
Check the grounds on the blower motor.
Get a schematic and follow the wiring for possible trouble spots.
Test the switch for the blower.
You seem to be able to do the work
Just that you don't have enough experience to follow through to fix it.
Good Luck.
Hopefully Autospark will come around and give his expert advice
Assuming all the fuses are OK, what I'd do in this case is check the voltages are correct at the blower relay. If the relay doesn't switch on there wont be any power supplied to the blower motor.
I've attached a diagram of the relay harness connector below. Remove the relay and switch on the ignition on. Set the blower control switch set to any speed then measure the voltages as shown on the diagram. If the voltages are correct then use a wire link to bridge terminals 1 & 2 to see if that makes the motor run. If the voltages are correct and the motor runs when the wire link is connected that suggests the relay is faulty. If the motor still doesn't run that suggest the fault is on the ground side of the circuit.
Well, everything looks OK on the power supply side of things so the fault must be on the ground side of the circuit. The ground comes from the switch and routes to the blower motor via the resistor, except speed 4 which bypasses the resistor and applies a ground directly to the motor to make it operate at it's max speed.
I've just been advising someone on the Sonata forum on how to test the switch and resistor wiring. It's the same circuit as your Elantra so have a read of my posts at the link below :
The guy on the Sonata forum had already removed the switch so I explained how to do a bypass test on the switch but in your case I'd skip that bit and do the wiring tests at the blower resistor first (Post #16 ).
I have the same problem with my A/C-heater blower.
When I turn the AC on I could hear a clicking sound from the blower área near the Glove compartment and no air comes out at all.
But when i turn it off and the car is moving I could feel cool air coming out the venta for a minute or 2.
I took it to a mechanic so he could check it out for me over the weekend.
Have you fix the problem on your car
We finally found some of the problem, we think.
I ran a new ground wire from the blower motor and the fan
now works with the switch....except its the same speed on all settings.
I guess a full blower is better than no blower at all, so not complaining too loud.
I went back and did the tests you outlined on the blower relay and it all
tested perfectly, just as you outlined.
I then went to the other post that you mentioned and did the test you had there
outlined for the resistor.
On this test I was able to find the ground as you said....and then
I found speed #1. But speed #2 & #3 showed nothing at all.
So.....any suggestions would be appreciated.
Could it be possible that we blew the blower relay messing around,
or its a bad blower relay? Its about the only thing we can think to do.
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