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Happened in my van too, the resistor was the problem. At first the fan stopped working, then suddenly it came on full speed and stayed full speed regardless of the position of the slider. The only way to stop it was to pull the plug at the bottom of the fan unit. Not visible on the photo behind the glove box. You have to stick your head upside down in the passenger footwell and look up behind the glovebox. On the positive side, the plug is easier to reach than the 3 torx screws that hold the assembly in.
I'm lucky to have a donor van. Took the fan from that, held it under the glovebox so that I could push the loose hanging plug into it, and it worked, responded to the slider as it should. So the slider, fuses, relays, wires, plugs and whatever else were fine. The problem had to be in the fan unit itself, and as it was going full speed when plugged in, the brushes clearly were good and the only explanation was a faulty resistor.
Removed the fan with the bad resistor and replaced with the fan assembly from the donor van. All fine since then, fingers crossed.
As others have remarked here, even when the 3 srews are removed the fan unit doesn't come out easy, you may have to get some wires and/or brackets out of the way.
I had the blower re-brushed a year or so ago and my memory lets me down but am I right in thinking that the power goes to the motor via the resistor? Hence although I’ve got power going to the unit doesn’t mean it’s reaching the motor?
Had the same problem recently, agree with the diagnosis, power reaching the resistor does not mean power is reaching the motor. In my van I took out the unit (3 torx screws, awkward to get at), replaced the resistor, problem solved. AS OAT already mentioned, replacing the complete fan unit is also possible.
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