Bring back full fan-speed control across your vehicle's heating and cooling settings with the Standard Ignition HVAC Blower Motor Resistor RU-878 (also written RU878). It drops in as a direct-fit replacement for the 2004-2011 Saab 9-3 and 2010-2011 Saab 9-3X — see the Buyer's Guide tab for engine-level fitment. The resistor regulates the current sent to the blower motor, setting each of the selectable fan speeds; when it fails, the blower often works on only high (or one setting) while the lower speeds drop out.
- Premium copper connectors: used for more precise resistance values, which improves resistor performance and offers longer part life.
- Variable-speed control: restores A/C and heater blower motor variable speed control, helping to optimize HVAC performance and passenger comfort.
- Saab-specific design: specifically designed for Saab applications, with research and design aimed at seamless integration with the vehicle's HVAC system.
- Tested performance: undergoes extensive testing at the facility to help ensure correct performance in a range of conditions.
If a failed blower motor resistor is the cause of your missing fan speeds, this replaces it.
Interchange: RU1567 · JA1756 · BR777 · 13123053 · 13250114
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the HVAC blower motor resistor do?
It regulates the current delivered to the blower motor, which sets the selectable fan speeds for the heating and air conditioning system.
What are signs this resistor may need replacing?
Common signs include the blower working only on high (or one speed) while the lower settings stop responding. Diagnose the cause before replacing, as wiring or the switch can also be at fault.
Does the RU-878 fit my vehicle?
It's a direct-fit replacement for the 2004-2011 Saab 9-3 and 2010-2011 Saab 9-3X. Check the Buyer's Guide tab to confirm the fit for your vehicle.
What numbers does this part interchange with?
It replaces RU1567, JA1756, BR777, 13123053, and 13250114.
Why does this resistor use copper connectors?
Premium copper electrical connectors are used for more precise resistance values, which improves resistor performance and offers longer part life.
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