Keep heater and A/C fan speeds under your control with the Standard Ignition Blower Motor Resistor RU-318, the part that sets how fast the blower motor spins at each fan setting. It fits many Ford and Mazda vehicles, among them the 1987-1996 Ford F-150, 1987-1998 Ford F-250 and 1991-1994 Ford Explorer. It is a direct-fit replacement for the listed applications and is listed for the rear position. See the Buyer's Guide tab for the full list.
If a failed resistor is the reason your fan has lost some of its speeds, this unit is designed to bring back variable A/C and heater blower speed control. That supports HVAC performance and passenger comfort.
A fan that runs only on its highest setting, or that skips one or more speeds, is a sign this part may need replacing. Diagnose the blower circuit before you buy parts.
Interchange: 19113249 · RU1013 · JA1176 · BR223 · 4C2Z18591BA · 4C2Z199706BA · 4C2Z19A706BA · E7TZ19A706A · ZZL161D85 · ZZM161B15 · ZZM261B15 · ZZM361B15 · BR223SB · BMR10 · RU318T
This part cross-references / interchanges with the following part numbers:
Is RU-318 the right 1987-1996 Ford F-150 blower motor resistor for my truck?
It is listed for the 1987-1996 Ford F-150, along with the 1987-1998 Ford F-250 and 1991-1994 Ford Explorer. Check the Buyer's Guide tab to confirm your exact vehicle.
What does an hvac blower motor resistor do?
It controls the current reaching the blower motor so the heater and A/C fan can run at different speeds. RU-318 also has a built-in fuse to help guard against current surges.
What are signs a blower motor resistor may need replacing?
Common signs are a fan that runs only on its highest setting or skips some speeds. Other faults can cause similar symptoms, so diagnose the blower circuit before replacing parts.
What connectors and terminals does RU-318 use?
It uses copper electrical connectors for precise resistance values. Its tin-plated steel terminals are chosen for corrosion resistance and conductivity.
Does Standard Ignition test this resistor?
Yes. Standard Ignition says the resistor undergoes extensive testing at its facility to check for correct performance.
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.
