XG300 Heater Blower Stays ON

Well it is Winter , but really I would like to be able to turn that $!@#
blower off, or at least down! Yesterday, when the sun came out for 3 minutes
(BC Canada) I pushed the off button on the AC -heater control. It turned the
light display off & nothing else. The blower kept going at near full speed.
I can select different temps & 'modes' but that blower won't shut off or go
to a lower speed no matter what. At least it shuts off when I take the key
out.
I'm guessing it's a relay that's locked on but that HMA service diagram is
NOT simple -looks like 2 different relays with a power transistor & I don't
see a trouble-shooting guide on that.
Anyone else seen this ? Hyundai Tech? Thanks for any help or comments.
Merry 'toasty' Christmas,
BCinBC

 

Either the "high blower relay" or "power transistor" is shorted. In most
cases, the problem is the power transistor.

At the bottom of the schematic, click on the "component location index"
link and then click on the name of the component you want to see. It'll
bring up a nice picture of the location. I only looked at the list
quickly and didn't see a link for the power transistor. It's located
where the blower relay would normally be located on a vehicle with manual
controls. Click on the "blower resistor" link to see the picture for the
power transistor.

 

Thanks again Hyundaitech,
This is the 3rd electrical issue I've had come up on this XG this
year -about 65,000 mi. (103,000km) on it . Given where we live -middle of
nowhere- seriously to get to a dealer that knows anything about this
vehicle, I've got at least a 6 hour drive through high mountain passes that
may or may not be open due to our Winter conditions here in the Interior of
British Columbia. Usually that means a minimum of one overnight at a motel,
if I'm lucky. Now let me tell you the auto repair is cheap relative to the
shopping my wife will do in the Mall while we wait for the car to be fixed.
That's why I try to repair it out in the SNOW, so thanks again for all your
help.
But I have to say my 1990 beat-up old Ford F250 with rust holes in the
floor for the melted snow to drain out, looks better & better to me. And the
heater works just fine! The only thing a bit 'cranky' is the driver.

BCinBC
PS: Had all these funny shiny wet spots about 2" circles/ ellipses behind a
rear wheel the other morning. Took a bit of detective work, but the snow
tracks told the story. Seems deer must have been licking the dried salt
(from the slippery roads) off the lower rear fender!