Chevrolet / Buick 4-Pin 2.8mm Waterproof Fan Motor Wire Harness Connector – OEM 12191399 / 12191387
Direct OEM-specification replacement for the Delphi 4-pin female waterproof wire harness connector used on cooling fan motors across Chevrolet and Buick GM platforms. Cross-references Delphi / GM OEM part numbers 12191399 and 12191387. Uses the 2.8mm contact series in black nylon housing with waterproof sealing — designed for underbonnet variable-speed cooling fan motor applications on GM Ecotec and LT engine platforms.
The 4-pin fan motor connector on Chevrolet and Buick vehicles is used on variable-speed cooling fans controlled by the ECM via a PWM signal. A failed connector causes the cooling fan to stop operating or to run at a fixed speed, leading to engine overheating in traffic or A/C performance degradation at low vehicle speeds.
| OEM Number | Application |
|---|---|
| 12191399 | Delphi 4-pin fan motor connector (primary) |
| 12191387 | Delphi 4-pin fan motor connector (alternate) |
| Pin | Function | Failure Symptom if Open |
|---|---|---|
| 1 | Fan motor power supply (12V, high-current) | Fan not operating, engine overheating |
| 2 | Fan motor ground (high-current) | Fan inoperative |
| 3 | PWM speed control signal from ECM | Fan runs at fixed speed or not at all |
| 4 | Fan speed feedback / tachometer signal | ECM loses fan speed data, cooling fault |
| Attribute | Detail |
|---|---|
| Pin Count | 4-Pin |
| Contact Series | 2.8mm pitch |
| Gender | Female |
| Housing Material | Nylon, black |
| Sealing | Waterproof |
| OEM Part Numbers | 12191399 / 12191387 |
| Applications | Variable-speed cooling fan motor, radiator fan, condenser fan |
| Compatible Models | Chevrolet Cruze / Malibu / Equinox / Trax; Buick Excelle GT / Regal / LaCrosse |
| Terminal Included | Yes |
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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4 Pin Connectors
