Mahle C31855 Engine Coolant Thermostat Gasket

Engine Coolant Thermostat Gasket for Mazda and Ford

Mahle C31855 is an OEM-standard engine coolant thermostat gasket made with molded rubber for a precise seal at the thermostat housing to block. It is built for service on a wide range of Mazda, Ford, Mercury, and related applications where a reliable coolant seal is required.

Mahle gaskets are trusted by OEMs and technicians for sealing performance, and this thermostat gasket follows that same OE-style approach for service work on vehicles such as the Mazda 3, Ford Focus, and Mazda MX-5 Miata.

Key Features

• Molded rubber gasket material for thermostat housing sealing
• OEM Standard item grade for service replacement use
• Contains thermostat gasket for the listed application
• Engine coolant thermostat gasket for thermostat housing to block sealing
• Mahle C31855 cross-references FEL-PRO 35776 and Ford 1S7Z-8255-BC

Detailed Description

Mahle C31855 is an engine coolant thermostat gasket engineered for thermostat housing to block applications across multiple Ford and Mazda platforms. The molded rubber construction helps maintain a consistent seal at the coolant passage, supporting proper thermostat housing service on vehicles including the 2004-2013 Mazda 3, 2003-2011 Ford Focus, and 2006-2015 Mazda MX-5 Miata. The part number C31855 is also referenced in OE and aftermarket catalogs for the same application.

This gasket is a direct-fit sealing component for cooling system maintenance where the thermostat housing is removed and reinstalled. Mahle C31855 is also listed for the 2005-2012 Ford Escape, 2001-2011 Ford Ranger, 2003-2011 Mazda 6, 2007-2011 Mazda CX-7, 2008-2011 Mazda Tribute, 2005-2011 Mercury Mariner, and 2006-2009 Mazda 5.

What It Helps Address

• Coolant seepage at the thermostat housing
• Sealing issues after thermostat service
• Leak paths between the thermostat housing and engine block
• Replacement of a worn or flattened thermostat gasket
• Cooling system maintenance on Mazda 3, Ford Focus, and Mazda MX-5 Miata applications

Installation Notes and Tips

Clean the thermostat housing and block mating surfaces before installation. Inspect the housing for corrosion, pitting, or distortion that could affect sealing. Use the gasket in the thermostat housing to block location specified for the vehicle, and follow the service procedure for the exact engine configuration. Confirm fitment by year, make, and model before assembly.

Quality Assurance

Mahle supplies sealing products used by OEMs and professional technicians worldwide. C31855 is an OEM-standard thermostat gasket built to meet the demands of routine cooling system service.