Designed to restore variable fan speed control, the Standard Ignition RU-408 is a direct-fit 2005-2011 Ford Crown Victoria blower motor resistor, and it also fits the 2005-2011 Mercury Grand Marquis. If a failed resistor has left your heater and A/C fan stuck on one speed or missing some settings, this unit is a direct-fit replacement for the listed applications.
The blower motor resistor controls how much current reaches the blower motor, which sets the fan speeds you select at the climate controls. When the original wears out or burns open, some or all fan speeds can stop working. If you're planning a blower motor resistor replacement on a 2005-2011 Ford Crown Victoria, the RU-408 is built around these supplier features:
Engine details and the full application list are in the "Vehicles it fits" section.
Interchange: RU1102 · JA1507 · BR312 · 4W7Z19A706A
This part cross-references / interchanges with the following part numbers:
Is the RU-408 also a blower motor resistor for the 2005-2011 Mercury Grand Marquis?
Yes. The Standard Ignition RU-408 is listed for the 2005-2011 Mercury Grand Marquis. You can check your exact vehicle in the "Vehicles it fits" section.
What does an HVAC blower motor resistor do?
It controls the current sent to the blower motor, which sets the fan speeds you choose for the heater and A/C. A failed resistor can leave the fan without some or all of its speeds.
What are signs a blower motor resistor may need replacing?
Common signs include a blower that only runs on one speed, some fan settings not working, or no blower at all. Other faults can cause these too, so diagnose the cause before replacing the part.
What is the RU-408 built with?
It uses premium copper electrical connectors for more precise resistance values and Kanthal D resistor wire for flexibility, durability and tensile strength in the wiring attached to the higher-watt resistors.
Which part numbers does the RU-408 interchange with?
The RU-408 interchanges with RU1102, JA1507, BR312 and 4W7Z19A706A.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
