If a failed resistor has left your heater and A/C fan stuck on one speed or skipping settings, the Standard Ignition RU-638 front Blower Motor Resistor is designed to restore variable speed control to the blower motor. It fits many vehicles, among them the 2005-2006 Jeep Grand Cherokee, 2010-2013 Jeep Liberty and 2004-2005 Dodge Durango, as a direct-fit replacement for the listed applications. See the "Vehicles it fits" section for the full list and engine details.
This HVAC blower motor resistor works in the blower circuit, varying the power that reaches the blower motor so the fan can run at its different speed settings.
Signs this part may need replacing: the blower runs on only one setting, some fan speeds do nothing, or the fan works intermittently. Other blower-circuit faults can cause similar symptoms, so diagnose the circuit before replacing the resistor.
Interchange: RU1328 · 4885482AA · 4885482AB · 4885482AC · 68003999AA · 68038199AA · RL885482AC · JA1623 · BR539 · BR539SB · BMR90 · RU638T
This part cross-references / interchanges with the following part numbers:
Is this the right blower motor resistor for a 2005-2006 Jeep Grand Cherokee?
It is a direct-fit replacement for the 2005-2006 Jeep Grand Cherokee, and it fits many other vehicles as well. Check the "Vehicles it fits" section to confirm your exact year and model.
Does it also fit the 2010-2013 Jeep Liberty and 2004-2005 Dodge Durango?
Yes, it is listed for the 2010-2013 Jeep Liberty and the 2004-2005 Dodge Durango. The "Vehicles it fits" section shows every listed application.
What does a blower motor resistor do?
It varies the power sent to the blower motor so the heater and A/C fan can run at different speeds. The RU-638 is a front blower motor resistor.
What are the signs of a failing blower motor resistor?
Common signs are a fan that works on only one speed, settings that do nothing, or intermittent fan operation. Other blower-circuit faults can cause the same symptoms, so diagnose before replacing.
What features does the Standard Ignition RU-638 offer?
It uses premium copper electrical connectors for more precise resistance values. It is also extensively tested at the manufacturer's facility for correct performance in all conditions.
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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.
