Product Description
Genuine Cummins
Cummins 3928499 — 180° Coolant Thermostat
MPN: 3928499 | Also Known As: engine thermostat, 180-degree thermostat | Opening Temp: 180°F
Why This Part
- ✓ OE 180° regulation for proper warm-up & operating temperature.
- ✓ Direct-fit for 1994–1998 Ram 5.9L 12-valve.
- ✓ Restores coolant flow control to protect engine and heater performance.
- ✓ Genuine Cummins build quality and durability.
OE Fit Stock Replacement 1 Per Engine
Quick Specs
| Type | Engine coolant thermostat |
|---|---|
| OE Part # | 3928499 |
| Opening Temperature | 180°F |
| Gaskets | Sold separately (see “Often Paired With”) |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L Cummins 12-Valve (6BT) | Dodge/Ram 2500 & 3500 |
Notes: This listing targets 1994–1998 12-valve trucks. Earlier 1989–1993 12V applications may use different part/gasket combinations—verify by VIN/ESN.
Often Paired With
- Thermostat Gasket (O-ring): Cummins 3925466 (’94–’98 12V)
- Thermostat Housing Cover Gasket: Cummins 3933325 (’94–’98 12V)
- Fresh coolant: refill/bleed after service
What’s In The Box
- (1) Genuine Cummins 180° Thermostat (3928499)
- Gaskets sold separately (see “Often Paired With”).
Install Tips
- Drain enough coolant below thermostat level; clean mating surfaces.
- Replace required gaskets; torque housing fasteners to spec.
- Refill with correct coolant; bleed air and verify operating temperature.
FAQ
WILL THIS FIT MY 1994–1998 5.9L 12-VALVE RAM?Yes—3928499 is the OE 180° thermostat specified for 1994–1998 5.9L 12V trucks (verify by VIN/ESN).
WHAT TEMPERATURE IS THIS THERMOSTAT?It’s a 180°F thermostat (stock rating for these applications).
DOES IT INCLUDE GASKETS?No—order the matching gasket(s) separately: 3925466 (O-ring) and 3933325 (housing cover gasket).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3928499 for factory fit and reliability.
WHAT ARE SIGNS OF A BAD THERMOSTAT?Slow warm-up, unstable temp, overheating, or no cabin heat. Replace promptly to protect the engine.
