Overview
The Crown Automotive 4720278 is a heater blower motor resistor for the 1994–2002 Dodge Ram 1500, the 1999 Jeep Grand Cherokee (WJ) and the 1993–1998 Jeep Grand Cherokee (ZJ). It controls the speed of the heater fan and is a direct fit replacement for the trims covered.
Key features
- Controls heater fan speed through the blower motor circuit
- Direct fit listing for the listed Ram 1500 trims
- Direct fit listing for the 1999 WJ Laredo and Limited trims
- Direct fit listing for the 1993–1998 ZJ trims
Heater fan speed control
The blower motor resistor is a set of fixed resistance stages that lowers the voltage reaching the heater blower motor. Lower speeds pass through more resistance, while high speed bypasses the resistor and sends full voltage to the motor. It sits in the heater or blower housing, where heat and moisture can wear its contacts.
When a resistor fails, the usual symptom is a fan that works on only one or two speeds, or not at all on low. Blower motors often draw more current when worn, so inspect the motor, its wiring and the connector for heat damage whenever the resistor is replaced. Keep the connector clean and fully seated, and check the fan on every speed after installation.
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | 4720278 |
| Part type | Heater blower motor resistor |
| Function | Controls blower motor speed |
| Fitment type | Direct fit |
Vehicle fitment
Listed fitment covers the 1994–2002 Dodge Ram 1500 in Base, LT, Laramie, SLT, ST, Sport and WS trims, the 1999 Jeep Grand Cherokee (WJ) in Laredo and Limited trims, and the 1993–1998 Jeep Grand Cherokee (ZJ) in 5.9 Limited, Base, Laredo, Limited, Orvis, SE and TSi trims.
The list does not include Ram model years outside 1994–2002, Ram 2500 or 3500 models, or other Grand Cherokee generations. Confirm your vehicle’s year, model and trim before ordering.
What’s included
One resistor is supplied. Check the package contents against your installation before starting.
