HomeBelts and Cooling > Gaskets and Sealing SystemsMahle C31138 Engine Coolant Thermostat Gasket
Part #: C31138

Mahle C31138 Engine Coolant Thermostat Gasket

⚙️ 52 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$10.21Free 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: Ford and Mazda, Explorer, Ranger, B4000, Aerostar, Navajo, and Bronco II
🔄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 Ford and Mazda Vehicles

The Mahle C31138 Engine Coolant Thermostat Gasket is designed to provide a secure seal for your vehicle's thermostat housing. Engineered with molded rubber, this gasket ensures a tight fit and reliable performance for Ford and Mazda models including the Aerostar, B4000, Bronco II, Explorer, Navajo, and Ranger.

  • Constructed from durable molded rubber for effective sealing
  • Meets OEM standard for quality and fitment
  • Sold as a single gasket per package
  • Compatible with multiple Ford and Mazda models
  • Part number C31138 for precise identification

Durable Molded Rubber Material for Effective Sealing

This engine coolant thermostat gasket is made from molded rubber, a material known for its flexibility and resistance to heat and coolant exposure. The gasket maintains a secure seal between the thermostat housing and engine block, preventing coolant leaks that can lead to engine overheating. Meeting OEM standards, the Mahle C31138 gasket ensures proper fit and function, matching the specifications required by Ford and Mazda vehicles.

Compatible Ford and Mazda Models

The Mahle C31138 gasket is compatible with a range of Ford and Mazda vehicles, including the Ford Aerostar, B4000, Bronco II, Explorer, Navajo, and Ranger. This compatibility makes it a suitable replacement part for owners and mechanics working on these specific models, ensuring proper fit and reliable engine cooling system performance.

Common Applications and Issues Addressed

  • Prevents coolant leaks at the thermostat housing
  • Helps maintain proper engine temperature regulation
  • Reduces risk of engine overheating due to seal failure
  • Replaces worn or damaged thermostat gaskets
  • Ensures consistent coolant flow through the thermostat

Installation Notes and Tips

When installing the Mahle C31138 thermostat gasket, ensure the mating surfaces are clean and free of old gasket material or debris. Proper alignment of the gasket is critical to prevent leaks. Use manufacturer-recommended torque specifications when securing the thermostat housing bolts. Inspect the thermostat and housing for any signs of damage before installation to ensure optimal performance.

Quality Assurance and Warranty

Mahle manufactures this engine coolant thermostat gasket to meet OEM standards, providing reliable quality and fitment. While specific warranty details may vary, Mahle products typically come with a limited warranty against defects in material and workmanship. Refer to Mahle's warranty policy for complete information.

BrandMahle
Part NumberC31138
Gasket MaterialMolded Rubber
Item GradeOEM Standard

This part fits 52 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2000FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
2000FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
2000MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1999FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1999FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1999MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1998FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1998FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1998MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1997FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1997FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1997FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1997MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1996FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1996FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1996FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1996MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1995FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1995FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1995FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1995MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1994FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1994FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1994FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1994MazdaB40004.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1994MazdaNavajo4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1993FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1993FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1993FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1993MazdaNavajo4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1992FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1992FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1992FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1992FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1992MazdaNavajo4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1991FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1991FordExplorer4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1991FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1991FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1991MazdaNavajo4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1990FordAerostar4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1990FordBronco II2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1990FordRanger4.0LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1990FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1989FordBronco II2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1989FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1988FordBronco II2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1988FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1987FordBronco II2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1987FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1986FordBronco II2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.
1986FordRanger2.9LV6N/AFor optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.

* 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:

35404

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