Product Description
If your 1998 Dodge Ram 2500/3500 5.9L 12-valve Cummins is throwing flaky temperature readings, going into high-idle when it shouldn’t, or the gauge just sits dead cold, the genuine CUMMINS 3920364 OEM COOLANT TEMPERATURE SENSOR is the correct drop-in fix. This engine coolant temperature (ECT) sensor threads into the front right corner of the cylinder head near the thermostat housing and feeds the PCM/cluster an accurate coolant temperature signal so your 12-valve runs clean, cool, and predictable.
This is not a generic parts-store sender—it’s a real Cummins service part with the correct calibration, connector indexing, and sealing surfaces for long-term durability on your 5.9L 12V.
FEATURES & BENEFITS
- Genuine Cummins 3920364 engine coolant temperature sensor (ECT).
- Direct-fit for 1998 Ram 2500/3500 5.9L 12-valve (6BT) applications.
- Correct 2-pin connector for late 12-valve harnesses.
- OE-accurate temperature signal helps prevent overfueling and overheating due to bad data.
- Brass sensor body with Cummins-spec internals for long life in high-heat, high-vibration diesel use.
FITMENT DETAILS
- Engine: 5.9L 12-Valve Cummins (6BT)
- Vehicle: Dodge/Ram 2500 & 3500
- Model Year: 1998 (12-valve only)
- Location: Front right corner of cylinder head near thermostat housing.
- Quantity Required: 1 per engine.
Note: Earlier 12-valve trucks typically use Cummins 3920363 OEM Coolant Temperature Sensor (1992–1997), and common-rail ISB 5.9L engines use Cummins 4897224 OEM Coolant Temperature Sensor. Always verify by VIN/engine serial number.
CROSS-REFERENCE & RELATED CUMMINS PARTS
- Cummins 3920363 OEM Coolant Temperature Sensor – 5.9L 12V (1992–1997)
- Cummins 4897224 OEM Coolant Temperature Sensor – ISB 5.9L (2003–2004)
- Cummins 3926761 OEM Engine Coolant Check Valve – 5.9L 12-Valve
- Cummins 3921640 OEM Valve Stem Seal – 5.9L 12-Valve (1989–1998)
- Cummins 3930318 OEM Throttle Position Sensor (TPS) – 5.9L 12-Valve (1994–1998)
WHAT’S INCLUDED
- (1) Genuine Cummins 3920364 engine coolant temperature sensor (ECT).
- Factory-style sealing surfaces (no generic crush-washer guessing).
Connector/pigtail is not included. If your connector is brittle or melted, pair this sensor with a quality 2-wire repair pigtail designed for Cummins 3920364/4954905-style coolant sensors.
INSTALLATION NOTES
- Allow the engine to cool and relieve any residual pressure in the cooling system before removal.
- Catch and properly dispose of any coolant lost when swapping the sensor.
- Lightly lubricate the threads/seal as per Cummins service information and torque to OE specification.
- After installation, top off coolant, bleed any air, clear fault codes, and verify temperature readings with a scan tool.
FAQ
WILL THIS SENSOR FIT MY 1998 5.9L 12-VALVE CUMMINS?
Yes. Cummins 3920364 is the correct OEM coolant temperature sensor for 1998 Dodge Ram 2500/3500 trucks equipped with the 5.9L 12-valve Cummins engine. Always confirm fitment by VIN or engine serial number before ordering.
WHAT SENSOR DO 1992–1997 12-VALVE TRUCKS USE?
Most 1992–1997 Ram 2500/3500 5.9L 12-valve trucks use Cummins 3920363 for coolant temperature. For those applications, use the 3920363 OEM coolant temperature sensor instead of 3920364.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This is a genuine Cummins OEM service part, sourced through CPP Diesel. You get factory-correct calibration, construction, and quality control—no guesswork from offshore clones.
CAN A BAD COOLANT TEMPERATURE SENSOR CAUSE DRIVEABILITY ISSUES?
Yes. Incorrect temperature data can affect fueling, timing, idle speed, cold-start behavior, gauge readings, and overheat protection. Replacing a failed sensor with an OEM Cummins 3920364 restores the correct signal so the PCM and cluster can respond properly.
SHOULD I REPLACE ANYTHING ELSE WHILE I’M IN THERE?
On a high-mileage 12-valve, it’s smart to inspect the thermostat, coolant check valve, coolant hoses, and electrical connectors at the same time. Many owners pair this sensor with fresh thermostats, valve stem seals, and other key Cummins sensors to baseline the engine.
SPECIFICATIONS
| Specifications for cummins 3920364 | |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3920364 |
| Product Type | Engine Coolant Temperature Sensor (ECT) |
| Engine Compatibility | 5.9L 12-Valve Cummins (6BT) – 1998 Dodge/Ram 2500 & 3500 |
| Connector Style | 2-pin late 12-valve style |
| UPC | Not specified by manufacturer |
| GTIN | Not specified by manufacturer |
| Cross Reference | Cummins 3920363 (ECT – 5.9L 12V 1992–1997); Cummins 4897224 (ECT – ISB 5.9L 2003–2004); Cummins 4954905 (later-model coolant temp sensor – pigtail compatible) |
| E-Codes / Emissions Notes | Not emissions-calibrated; service sensor for non-certified 5.9L B-series applications. |
| Shipping Weight | Approx. 0.1 lb (small-parcel item) |
| Shipping Info | Ships from CPP Diesel; typically sent via standard ground parcel. Packaged in Cummins retail box when available. |
| Prop 65 | Not specifically listed – no manufacturer Prop 65 warning provided. Always follow local regulations. |
