Product Description
Restore a leak-free seal at the thermostat housing with the MAHLE C31858 Coolant Thermostat Gasket for 2003–2007 Dodge Ram 2500/3500 with the 5.9L Cummins. This molded-rubber OE-style gasket delivers a reliable seal that helps maintain stable operating temperature and long service life.
Fitment
- 2003–2007 Dodge Ram 2500 / 3500 — 5.9L Cummins (24-valve)
Cross-Reference / Alternatives (Mahle on CPP Diesel only)
- MAHLE C31421 Coolant Thermostat Gasket (1989–1998 5.9L Cummins)
- MAHLE 54557 Head Gasket (2003–2007 5.9L Cummins)
- MAHLE 54556A Head Gasket (2003–2007 5.9L Cummins)
- MAHLE OS32278 Oil Pan Gasket (2003–2007 5.9L Cummins)
Notes
Clean both mating surfaces, inspect the housing for corrosion/pitting, and torque fasteners to OE specification. Thermostat not included.
FAQ
Will this fit my 2003–2007 5.9L Cummins?
Yes—C31858 fits 2003–2007 Ram 2500/3500 with the 5.9L Cummins (24-valve).
Is the thermostat included?
No. This listing is for the gasket/seal only. Pair with the correct 180° or 190° thermostat for your application.
What material is the gasket?
Durable molded-rubber construction for OE-style sealing at the water outlet/thermostat housing.
Specifications for Mahle C31858
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | C31858 |
| Engine Compatibility | 2003–2007 Dodge Ram 2500/3500, 5.9L Cummins (24-valve) |
| UPC | 27067712226 |
| GTIN | 027067712226 |
| Shipping | Calculated at checkout; optional shipping insurance available at checkout |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Learn more |
