Product Description
CUMMINS 3969987 OEM INTAKE AIR HEATER GRID – RAM 5.9L (1998.5–2007)
The genuine CUMMINS 3969987 OEM intake air heater grid restores proper cold-start operation on 5.9L Cummins engines from 1998.5–2007. This heater grid pre-warms incoming air to improve combustion stability, reduce white smoke, and help your ISB engine fire cleanly in cold climates. If your truck struggles to start in winter, sets heater-related fault codes, or shows signs of uneven grid heating, this factory Cummins replacement ensures reliable OEM performance.
Unlike aftermarket heater grids that often suffer from uneven heating elements, low durability, or poor fits, this original Cummins heater grid is engineered for correct electrical load balance, heat output, and mounting alignment. It installs directly between the intake plenum and horn using the factory hardware and connectors.
Key Features
- Genuine Cummins OEM heater grid — correct fit, heat output, and electrical load.
- Improves cold-weather starting and reduces smoke on initial startup.
- Direct bolt-in design for 1998.5–2007 5.9L Cummins engines.
- High-durability heating element for long-term reliability.
- Compatible with OEM intake horn and electrical connectors.
Fitment Details
- Engine: 5.9L Cummins ISB (24-valve)
- Years: 1998.5–2007
- Applications: Dodge Ram 2500 & 3500 (5.9L Cummins)
- Notes: Fits both early 24V (1998.5–2002) and common rail (2003–2007) models.
Cross-Reference & Companion Cummins Parts
Pair the CUMMINS 3969987 heater grid with other genuine components for a complete intake assembly refresh:
Common Cummins reference numbers: 3969987, 3975636 (verify by VIN/ESN).
Installation Notes
- Disconnect both batteries before servicing any heater grid components.
- Inspect wiring terminals and relays for corrosion.
- Replace intake horn gasket if damaged during removal.
- After installation, perform a cold-start check to ensure proper operation.
Specifications for cummins 3969987
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3969987 |
| Alternate Part Numbers | 3975636 (verify by VIN/ESN) |
| Function | Intake air heater grid / cold start heater element |
| Engine Compatibility | 5.9L Cummins ISB (1998.5–2007) |
| Vehicle Fitment | Dodge Ram 2500 / 3500 (5.9L Cummins) |
| UPC | 190910285028 |
| GTIN | 190910285028 |
| Shipping Weight | Approx. 2.0 lbs |
| Shipping Method | Standard ground; expedited options available |
| E-Codes / Emissions | Non-emissions component; assists cold-start combustion |
| Prop 65 Warning | WARNING: May expose you to chemicals known to cause cancer or reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
WILL THIS FIT MY 1998.5–2007 5.9L CUMMINS?
Yes — CUMMINS 3969987 is used on all 24-valve 5.9L ISB engines from 1998.5–2007. Always confirm with VIN/ESN for complete accuracy.
WHAT ARE SIGNS MY HEATER GRID IS FAILING?
Hard cold starts, excessive white smoke, uneven grid heating, or heater-related diagnostic codes are common symptoms.
DOES THIS INCLUDE RELAYS, WIRES, OR GASKETS?
No — this listing is for the heater grid itself. Inspect wiring, relays, and intake gaskets separately.
IS THIS A GENUINE CUMMINS PART?
Yes — CPP Diesel supplies only authentic Cummins OEM heater grids for proper cold-start performance.
DO I NEED TO REPROGRAM ANYTHING AFTER INSTALLATION?
No — the heater grid is a non-electronic passive heating element. Simply reinstall, reconnect wiring, and verify operation.
