Mahle C31998 Engine Coolant Thermostat Housing Gasket

Engine Coolant Outlet Gasket for OE Repairs

Mahle C31998 is an OEM-standard engine coolant thermostat housing gasket made from molded rubber for reliable sealing at the coolant outlet. It is built for service work on select Buick, Chevrolet, GMC, Saab, Saturn, and Pontiac applications where a precise thermostat-to-housing seal is required.

Mahle’s gasket line is known for OE-style sealing performance used by technicians and OEMs worldwide. This Engine Coolant Outlet Gasket is a direct-fit sealing component for coolant outlet and thermostat housing service, including applications such as the Chevrolet Malibu, Buick Regal, and Saab 9-3.

Key Features

• Molded rubber gasket material for a consistent seal
• OEM Standard item grade for service replacement
• Engine coolant thermostat housing gasket / engine coolant outlet gasket application
• Designed for select 2003-2017 GM and Saab vehicles
• Mahle part number C31998 for catalog and cross-reference lookup

Detailed Product Information

Mahle C31998 is an engine coolant thermostat housing gasket used to seal the coolant outlet connection between the thermostat housing and engine components. The molded rubber construction supports a tight, uniform fit at the sealing surface, helping maintain coolant system integrity during thermostat or housing service. This part is commonly searched as an engine coolant outlet gasket for Saab 9-3, Chevrolet Cobalt, Buick LaCrosse, and related applications.

This part cross-references FEL-PRO 36122 and Saab 90537471 for the same application. If you are replacing a leaking thermostat seal on a Chevrolet Equinox, GMC Terrain, or Buick Verano, Mahle C31998 provides an OE-standard sealing solution that matches the intended coolant outlet service fitment.

What This Gasket Helps Address

• Coolant seepage at the thermostat housing
• External coolant leaks around the engine coolant outlet
• Sealing issues after thermostat or housing replacement
• Loss of coolant from a worn or flattened gasket surface
• Service-related leaks on select Buick, Chevrolet, GMC, Saab, Saturn, and Pontiac models

Installation Notes and Tips

• Clean both mating surfaces thoroughly before installation.
• Inspect the thermostat housing and coolant outlet for pitting, warping, or residue.
• Follow the vehicle service procedure and torque specifications for the housing fasteners.
• For 2012-2017 Buick Regal, Buick Verano, Chevrolet Equinox, and GMC Terrain applications, use the included gasket from the thermostat seal set during installation of the Engine Coolant Thermostat Seal.
• Verify the exact engine configuration against the vehicle catalog before ordering.

Quality Assurance

Mahle manufactures sealing products to OEM-standard expectations and supplies gaskets trusted by OEMs and technicians around the globe. Part number C31998 is built for dependable fitment and sealing performance in the specified applications.

• Fits 2012-2017 Buick Regal, N/A
• Fits 2012-2017 Buick Verano, N/A
• Fits 2012-2017 Chevrolet Equinox, N/A
• Fits 2012-2017 GMC Terrain, N/A
• Fits 2012-2016 Buick LaCrosse, N/A
• Fits 2012-2015 Chevrolet Captiva Sport, N/A
• Fits 2014 Chevrolet Impala, N/A
• Fits 2012-2014 Chevrolet Malibu, N/A
• Fits 2009-2011 Saab 9-3, N/A
• Fits 2011 Saab 9-5, N/A
• Fits 2008-2010 Chevrolet Cobalt, N/A
• Fits 2008-2010 Chevrolet HHR, N/A
• Fits 2007-2010 Saturn Sky, N/A
• Fits 2007-2009 Pontiac Solstice, N/A
• Fits 2003-2008 Saab 9-3, N/A
• Fits 2005-2007 Chevrolet Cobalt, N/A
• Fits 2004-2007 Saturn Ion, N/A