There is a resistor network with a thermal fuse associated with the
switch that sets the fan speed. If the thermal fuse goes open circuit
then the three lower fan speeds are dead but the fastest setting still
As you say in an earlier post that _all_ speeds don't work it is
unlikely that the resistor network or thermal fuse is broken.
First check the fuses in the fuse boxes.
One fuse box is in the engine compartment.
The other fuse panel is behind the glove compartment. Open the glove
compartment and squeeze in the sides of the glove compartment. A tiny
bit of force will be required. The glove compartment is then released
and hangs down on its hinge to allow you access behind it
It is not unknown for the switch itself to fail.
If required, the motor fan can be removed from behind the glove
compartment as well as the resistor/thermal fuse network.
If the fastest speed still works see:
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