Mahle C31377 Engine Coolant Thermostat Housing Gasket

Engine Coolant Thermostat Housing Gasket for GM Applications

Mahle C31377 is an OEM-standard engine coolant thermostat housing gasket made from paper for a precise seal between the thermostat housing and cylinder head. It is built for select Chevrolet, GMC, Buick, Oldsmobile, and Pontiac applications where a reliable coolant seal is needed during thermostat housing service.

For technicians and DIY repairs, this gasket supports clean reassembly on vehicles such as the Chevrolet S10 and GMC Sonoma. Mahle C31377 is a direct-fit sealing solution for thermostat housing-to-head service on a wide range of GM platforms.

Key Features

• Paper gasket material for thermostat housing sealing
• OEM Standard item grade for service replacement use
• Engine coolant thermostat housing gasket application
• Paraphrased from Mahle’s OE-focused sealing product line for trusted fit and function
• Cross-references FEL-PRO 35430 and 35568 for the same application
• Part number C31377 for easy catalog lookup

Detailed Description

Mahle C31377 is an engine coolant thermostat housing gasket engineered for housing-to-head sealing on compatible GM vehicles. The paper construction helps create a dependable seal at the thermostat housing interface, where coolant leakage can occur if the gasket is worn, damaged, or reused. This gasket is a practical choice for service work on 1987-1993 Chevrolet S10, 1991-1993 GMC Sonoma, and other listed Buick, Oldsmobile, Pontiac, Chevrolet, and GMC models. If you are searching for a thermostat housing gasket for Chevrolet S10, GMC Sonoma, or related GM cars and trucks, C31377 is the correct catalog reference to verify.

What It Helps Fix

• Coolant seepage at the thermostat housing
• Leaks at the housing-to-head sealing surface
• Damaged or flattened original gasket material
• Service issues after thermostat housing removal
• Cooling system loss caused by a poor seal

Installation Notes and Tips

Clean both sealing surfaces thoroughly before installation and remove all old gasket material, corrosion, and coolant residue. Verify the thermostat housing and head surfaces are flat and free of pitting before installing the new gasket. Use the vehicle fitment list to confirm application details for your Chevrolet S10, GMC Sonoma, or other GM model before assembly. Part number C31377 should be matched to the exact engine and housing style listed in the catalog.

Quality Assurance

Mahle supplies sealing products used by OEMs and technicians worldwide, and this gasket is built to OEM-standard expectations for service replacement use.