Is this link of any help?
Bro -- I know exactly what the problem is, happened to me. It is the
resistor in the circuit -- call the dealer tell em and its like a $10
part. It is attached to the firewall on the passenger side. You don't
need to dismantle the dashboard at all. I think it is up behind the
glove box but actually easy to get to.
(The fan blower works on the highest setting, because that is the
full-bore electric of the system -- the resistor "tones it down"
progressively to achieve the less powerful levels.)
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