This is a common problem with all makes and models. The vehicle feeds full power to the fan switch and the switch routes that power to a resistor block. The resistor block reduces the voltage to reduce the speed of the blower motor. The resistor block accomplishes this task by running the voltage through one of three different high resistance coils. Think of these coils like a filament in a light bulb. The coils actually heat up, thereby reducing the amount of voltage that can flow to the blower motor. When a resistor coil burns out, you lose that fan speed. To repair the problem, simply replace the resistor block. It’s usually located in the ductwork (to keep the coils cool). Unplug the electrical connector, remove the screws and replace the unit. Replacement blocks are usually available from any auto parts store or the dealer. Prices range from $15-$40 dollars, unless you have a variable speed blower motor. Those require a new solid state controller. You guessed it, they cost a lot of money.
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© 2012 Rick MuscoplatPosted on by Rick Muscoplat