HomeBelts and Cooling > Gaskets and Sealing SystemsMahle C31421 Engine Coolant Thermostat Gasket
Part #: C31421

Mahle C31421 Engine Coolant Thermostat Gasket

⚙️ 30 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$15.08Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Dodge, Ram 2500, Ram 3500, D250, D350, W250, and W350
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Reliable Engine Coolant Thermostat Gasket for Dodge Vehicles

The Mahle C31421 engine coolant thermostat gasket is designed to provide a secure and durable seal for your Dodge D250, D350, Ram 2500, Ram 3500, W250, and W350 models. Crafted from molded rubber, this gasket meets OEM standards to ensure proper fit and function in your vehicle's cooling system.

  • Gasket material: Molded rubber for effective sealing and durability
  • Item grade: OEM standard ensuring compatibility and reliability
  • Package quantity: 1 gasket per package
  • Compatible with Dodge D250, D350, Ram 2500, Ram 3500, W250, and W350 models
  • Part number: C31421 for precise identification and ordering

Durable Molded Rubber Construction

This engine coolant thermostat gasket is made from molded rubber, a material known for its flexibility and resistance to heat and coolant fluids. The gasket maintains a tight seal between the thermostat housing and engine block, preventing leaks and ensuring optimal engine temperature regulation. Meeting OEM standards, the Mahle C31421 gasket is engineered to match the original equipment specifications for a reliable replacement part.

Compatible Dodge Models and Applications

The Mahle C31421 gasket is specifically designed for use with Dodge heavy-duty trucks including the D250, D350, Ram 2500, Ram 3500, W250, and W350. This ensures a precise fit and proper sealing performance in these models, supporting the cooling system's efficiency and preventing coolant leaks that can lead to engine overheating.

Common Issues Addressed by This Thermostat Gasket

  • Prevents coolant leaks at the thermostat housing
  • Maintains proper engine temperature regulation
  • Reduces risk of engine overheating due to seal failure
  • Eliminates coolant contamination from external debris
  • Ensures consistent thermostat operation and longevity

Installation Notes and Tips

When installing the Mahle C31421 thermostat gasket, ensure the mating surfaces are clean and free of old gasket material or debris. Proper torque specifications should be followed to avoid gasket deformation or leaks. It is recommended to inspect the thermostat housing and related components for wear or damage during installation to maintain optimal cooling system performance.

Quality Assurance and Warranty

Mahle manufactures this engine coolant thermostat gasket to meet OEM standards, providing assurance of fit, form, and function. While specific warranty details may vary, Mahle products typically come with a limited warranty against manufacturing defects, supporting confidence in the product's durability and performance.

BrandMahle
Part NumberC31421
Gasket MaterialMolded Rubber
Item GradeOEM Standard

This part fits 30 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
1998DodgeRam 25005.9LL6N/AOuter Seal; Rubber
1998DodgeRam 35005.9LL6N/AOuter Seal; Rubber
1997DodgeRam 25005.9LL6N/AOuter Seal; Rubber
1997DodgeRam 35005.9LL6N/AOuter Seal; Rubber
1996DodgeRam 25005.9LL6N/AOuter Seal; Rubber
1996DodgeRam 35005.9LL6N/AOuter Seal; Rubber
1995DodgeRam 25005.9LL6N/AOuter Seal; Rubber
1995DodgeRam 35005.9LL6N/AOuter Seal; Rubber
1994DodgeRam 25005.9LL6N/AOuter Seal; Rubber
1994DodgeRam 35005.9LL6N/AOuter Seal; Rubber
1993DodgeD2505.9LL6N/AOuter Seal; Rubber
1993DodgeD3505.9LL6N/AOuter Seal; Rubber
1993DodgeW2505.9LL6N/AOuter Seal; Rubber
1993DodgeW3505.9LL6N/AOuter Seal; Rubber
1992DodgeD2505.9LL6N/AOuter Seal; Rubber
1992DodgeD3505.9LL6N/AOuter Seal; Rubber
1992DodgeW2505.9LL6N/AOuter Seal; Rubber
1992DodgeW3505.9LL6N/AOuter Seal; Rubber
1991DodgeD2505.9LL6N/AOuter Seal; Rubber
1991DodgeD3505.9LL6N/AOuter Seal; Rubber
1991DodgeW2505.9LL6N/AOuter Seal; Rubber
1991DodgeW3505.9LL6N/AOuter Seal; Rubber
1990DodgeD2505.9LL6N/AOuter Seal; Rubber
1990DodgeD3505.9LL6N/AOuter Seal; Rubber
1990DodgeW2505.9LL6N/AOuter Seal; Rubber
1990DodgeW3505.9LL6N/AOuter Seal; Rubber
1989DodgeD2505.9LL6N/AOuter Seal; Rubber
1989DodgeD3505.9LL6N/AOuter Seal; Rubber
1989DodgeW2505.9LL6N/AOuter Seal; Rubber
1989DodgeW3505.9LL6N/AOuter Seal; Rubber

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

4728 2078350 6402

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.