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Old 09-26-2010, 04:41 PM   #1 (permalink)
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rvv2002
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Hey guys,

Car: 2007 Sonata 2.4L

I hadn't used my car for like 3 weeks until yesterday when I drove back to PA from MA. I turned the car on, a/c on and went for a nice 6 hour drive. About 2 hours in (with a/c working) I stopped for a break. The a/c blower would not turn on at that point. I could hear the compressor clicking on (and the RPMs would respond appropriately). I tried turning it off and on a couple of times but no go. I decided to keep on driving and figure it out when I got home.

About hour 5 I turned the knob from OFF to Max A/C and it turned on! It worked fine all the way home. I drove the car a couple of more times last night with no A/C issues at all. Well today the same thing happened. Went to go drive and no a/c blower. Compressor still turning on. I changed the only fuse/relay I could find that was dedicated to the blower inside the engine compartment (40A) with no luck. Am I missing any other important fuses?

Being that it intermittently works I'm thinking something might be lose or some electrical connection. Maybe my blower is dead? Any ideas would be appreciated!

Thanks in advance for all the help.
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Old 09-26-2010, 04:59 PM   #2 (permalink)
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The Blowers are poorly made. Same ones they put in the 1999 Elantra. If you have a Warranty left, It could be replaced

for free, but it has to be dead or they will send you away. There also seems to be some expensive electronics associated with

the blower which makes me worry as mine is acting up too. It changed sounds for about two weeks, but it is back to normal. I expect

it to break in a few months when my Warranty ends!
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Old 09-26-2010, 05:04 PM   #3 (permalink)
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A few questions. First, does the blower work with AC off? Does the blower work/not work at certain ventilation settings? Does the blower work/not work at certain fan speeds. Does the blower work/not work when in recirculation mode or fresh air mode? All that Max AC does is turn the fan to maximum speed, switch to recirulation mode and of course turn on the AC. I would try the various permutations of ventilation settings, fan speeds, recirc mode on/off, AC on/off to see if there is some sort of pattern or set of conditions where the blower does not work.
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Old 09-26-2010, 05:09 PM   #4 (permalink)
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This does not sound like symptoms of the Motor. It sounds like the Blower assy. I see a new one for $600. Very expensive with labor.

Actuator, Arm, Blower assy, Blower motor, Cover, Filter, Lever, Resistor, Transistor.
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Old 09-26-2010, 05:45 PM   #5 (permalink)
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Thanks for the quick reply ActionMan.

First, does the blower work with AC off? Nope.
Does the blower work/not work at certain ventilation settings?Nope...Doesn't turn on period. I've tried it with all the other variations and it won't budge.

Could there be a power wire/switch to the blower that might have become dislodged that I could get to?
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Old 09-26-2010, 06:10 PM   #6 (permalink)
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QUOTE (rvv2002 @ Sep 26 2010, 03:45 PM)
Quote:
Thanks for the quick reply ActionMan.

First, does the blower work with AC off? Nope.
Does the blower work/not work at certain ventilation settings?Nope...Doesn't turn on period. I've tried it with all the other variations and it won't budge.

Could there be a power wire/switch to the blower that might have become dislodged that I could get to?
Possibly, however you might want to check the cabin filter first. The blower is right above it and maybe there is something phyically preventing the blower from moving except on max setting. Turn the blower by hand to see if it moves freely. While there see if you can find any power connection to the blower to see if it is loose. The blower does work on max setting so at least it is getting power sometimes.
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Old 09-26-2010, 06:32 PM   #7 (permalink)
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If the blower does work, but only at Max A/C position, than obviously this is an electrical/ programing issue, not mechanical.

BUT THEN, at Max A/C all it does is turning to CIRCULATION, so internal air is circulating, no air is coming from the outside. Maybe that could be a clue to solving the problem....
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Old 09-26-2010, 10:49 PM   #8 (permalink)
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I'm sorry I guess made my original post confusing. When the blower is not working it doesn't work, period. It was just a coincidence that I had it on Max A/C the one time it worked.

It turned on again later today (independent of the vent setting it was on) and was working without any extra (aka. dying) noises. I'm going to have to check the wiring.
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Old 09-27-2010, 06:01 PM   #9 (permalink)
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I have the same problem. I was leaving work one day and my blower fan wouldn't work. After opening and closing the driver's door the fan started working. I have since checked the blower fan and it spins freely. Today on the way home the fan didn't work. I tried many combinations with a/c and different vent settings. I can hear the relay clicking near the blower fan even though the fan was not working. The fan never came on. I cut the car off and cut the car just to on and now the fan will work. Any ideas?
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Old 09-27-2010, 06:13 PM   #10 (permalink)
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QUOTE (ActionMan @ Sep 26 2010, 05:10 PM)
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Possibly, however you might want to check the cabin filter first. The blower is right above it
Actually the blower is right UNDER the filter (of course, so that the filter protect it from debris and dirt....). Once you remove the filter housing, you can touch the blower under.
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