How to replace the blower motor resistor for a 1999 Saab 93
A common problem with the Saab 900 and 93 equipped with manual
controls for the heater and air conditioner, is that the fan speed
may only work on setting "4" (high speed) or not at all. In this case, it is likely
that the resistor pack used to limit current to the blower motor may
need to be replaced.
The blower motor resistor is located under the cabin air filter. To
gain access to the blower motor resistor, the windshield wiper arms must
be removed, along with the false bulkhead, exposing the cabin air filter.
For instructions on how to gain access to the cabin air filter
click here.
Once the cabin air filter is removed, a screw that holds the blower motor
resistor in place may be removed. The resistor pack is shown below with a blue
plastic frame.
Once the screw holding the resistor pack in place is removed, the orange and brown
wires that are connected to the resistor pack may be removed. Each of these wires
has a single termination, and the connectors are different sizes to ensure that the
proper connection will be established.
Removal of the connector with multiple wires can be done by gently working the
connector out, using a flat headed screw driver on each side of the connector
to pry the connector apart from resistor pack.
Once the old resistor pack has been removed, the new resistor pack may
be plugged in to the connector with multiple wires. The connector is keyed to ensure
that the proper connection is made. Remove the "red dot" sticker
on the bottom of the new resistor pack, then slide the new resistor pack into
the blower motor assembly. Re-install the yellow, and orange wires, then the
screw to hold the blower motor resistor in place.
Successful operation of the blower motor resistor should allow one to adjust
the fan speed to operate at different air flow speeds.
last updated Dec 13, 2004