Product Description
Genuine Cummins
Cummins 3924755 — Molded Coolant Hose (Thermostat Housing → Cylinder Head)
MPN: 3924755 | Also Known As: crossover hose, molded heater/coolant hose | Location: Thermostat housing to cylinder head
Why This Part
- ✓ OE-formed hose for correct routing and no-kink flow.
- ✓ Direct-fit for 1994–1998 5.9L 12-valve Cummins (2nd Gen Ram).
- ✓ Resists heat & chemicals for long service life.
- ✓ Restores coolant transfer between the thermostat housing and cylinder head.
OE Fit Stock Replacement 1 Per Engine
Quick Specs
| Type | Molded coolant crossover hose |
|---|---|
| OE Part # | 3924755 |
| Path | Thermostat housing → cylinder head |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | Ram 5.9L B-Series Cummins (12-Valve) | Ram 2500/3500 |
Industrial/Off-Highway: Also used on certain B5.9 applications; verify by ESN before ordering.
Often Paired With
- Thermostat: Cummins 3934373 (180°)
- Thermostat Housing Cover Gasket: MAHLE C31710
- Fresh Coolant: refill/bleed after hose replacement
- New Hose Clamps if originals are corroded or fatigued
What’s In The Box
- (1) Genuine Cummins Molded Hose (3924755)
- Thermostat & gasket sold separately (see “Often Paired With”).
Install Tips
- Drain coolant below hose level; capture and recycle properly.
- Lightly lubricate fittings; seat hose fully and orient clamps behind beads.
- Refill, bleed air, and inspect for leaks at operating temp.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE CUMMINS?Yes—this hose connects the thermostat housing to the cylinder head on 1994–1998 Ram 2500/3500 5.9L 12-valve trucks (verify by VIN/ESN).
WHAT DOES THIS HOSE CONNECT?It’s the molded crossover hose from the thermostat housing to the cylinder head.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3924755 for proper fit and durability.
SHOULD I REPLACE THE THERMOSTAT OR GASKET TOO?It’s smart preventive maintenance to replace the thermostat (3934373) and the housing cover gasket (MAHLE C31710) if they’re old or leaking.
DOES THIS FIT INDUSTRIAL B5.9 ENGINES?Some B5.9 industrial variants use this hose; always confirm by ESN for non-automotive applications.
Product Videos
Custom Field
Vehicle Year 1994-1998
Vehicle Make DODGE
ENGINE CUMMINS
