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Sorry for the delay. This is an odd one and I'm sure not very many people have seen it happen before.
Do you have a multi-meter to do some electrical testing?
That's ok. There is a ground wire near the engine compartment fuse box that will sometimes burn up. I'm not sure why it does it, but my suspicion is that the quality of the installation of this wire was not good from the factory. If that ground wire is a little loose it will create heat and burn up. In the case I saw it got so hot that it damaged the fuse box and the entire box needed to be replaced before the car's accessories (lights, fans, etc) would operate properly.
Take a look at the wires coming from the fuse box on the diver's side of the engine compartment. There is a fairly thick (about the diameter of a pencil) wire that is black that runs from the fuse box to the body. If this wire looks damaged or burned then there is the problem. If it looks like it burned up the fuse box, then that will be a problem as well and will need to be replaced.
Well, at this point you will likely need to perform some electrical testing:
Check the voltage of the White/Black wire at one of the high beam headlights it should be almost 0 volts.
If there is voltage there check the ground connection behind the left headlight and junction connector A73 in the engine room fuse box. This wire could be back feeding voltage somehow. The only other likely cause would be a short internal to the fuse box.
The fan uses a relay on the driver side fender. It's the small relay box that has two relays in it. One is the horn, the other is the fan.
It will look like this:
The label on the lid will tell which one specifically. My manual does not. Either of the light blues, the red, or the purple.
No, that means that the fuse box is shorted internally. It is keeping the fan powered through a short in the circuit somewhere.
If you plan to fix it yourself you will need to perform electrical testing to see where the voltage is coming from. Then you should disassemble the fuse box and look for signs of a short; melted fuse sockets, wires, or a printed circuit board. You will then need to order a fuse box from the dealer and replace it.
Not really. You could unplug the connector at the fan to get the fan to stop, but it's just going to make your car overheat if you drive it like that. You would also need to unplug the headlight connector so it turns off as well.
It's a good idea to find the short. It could potentially create a fire if it is shorted enough to keep the fan running and headlight on. You probably don't want your car burning down.
Please let me know if you need additional info.
The headlight relay is part of the junction block. The whole junction block has to be removed to unplug it.
It may not even work to unplug it. You will probably need to unplug the light at the connector.
Unfortunately I don't know anyone in Houston. I would probably look for a good independent shop with a number of positive google reviews or Yelp scores.
Let me know if you need any additional help with this.
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