Fel-Pro 35771 Engine Coolant Thermostat Housing Gasket - Housing To Cylinder Head

Fel-Pro Thermostat Housing Gasket for Ford and Mazda

Fel-Pro 35771 is an engine coolant thermostat housing gasket built for housing-to-cylinder-head sealing. It uses application-specific materials to deliver a precise seal for Ford, Lincoln, Mercury, and Mazda vehicles across a wide range of model years.

Use this gasket when servicing the thermostat housing on applications such as the Ford Fusion, Ford Focus, Mazda 3, and Mazda MX-5 Miata. Fel-Pro 35771 is made to match the sealing demands of the cooling system and support consistent fitment at the thermostat housing interface.

Key Features

• Engine coolant thermostat housing gasket for housing-to-cylinder-head mounting
• Fel-Pro premium grade sealing solution
• Application-specific material selection for vehicle sealing
• 0.030 in. thickness / 0.7 mm thickness
• 4 mounting holes
• Fits a broad range of Ford, Lincoln, Mercury, and Mazda applications
• Part number 35771 for easy identification

Detailed Description

Fel-Pro 35771 is engineered for thermostat housing sealing where the housing attaches to the cylinder head. The gasket’s premium construction and specified thickness help provide a controlled sealing surface for cooling system service. This part is listed for many popular platforms, including Ford Fusion, Ford Focus, Mazda 3, and Mazda MX-5 Miata applications, along with additional Ford, Lincoln, Mercury, and Mazda models.

This part cross-references MAHLE B31861 and C31793 for the same application. If you are replacing a thermostat housing gasket on a Ford Fusion, Mazda 3, or Ford Focus, Fel-Pro 35771 offers a direct-fit sealing solution backed by Fel-Pro’s vehicle-specific gasket design approach.

What It Helps Address

• Coolant seepage at the thermostat housing-to-cylinder-head joint
• Loss of seal after thermostat housing service
• Leak paths caused by worn or compressed gasket material
• Cooling system maintenance on Ford, Lincoln, Mercury, and Mazda engines
• Replacement of a damaged thermostat housing gasket during repair

Installation Notes and Tips

Confirm the thermostat housing position is housing to cylinder head before installation. Clean both sealing surfaces thoroughly and inspect the housing and cylinder head for corrosion, pitting, or old gasket residue. Verify the part number 35771 against your vehicle’s engine and build date, especially on 2006 Ford Fusion and 2006 Mercury Milan applications with notes through 12/04/2005. Always follow the vehicle service procedure for coolant system reassembly and refill.

Quality Assurance

Fel-Pro gaskets are built around application-specific sealing materials and vehicle-focused fitment. Fel-Pro 35771 is a premium-grade thermostat housing gasket intended to deliver dependable sealing performance for the listed Ford, Lincoln, Mercury, and Mazda applications.

• Fits 2018-2021 Ford EcoSport, Housing To Cylinder Head
• Fits 2019-2021 Ford Transit Connect, Housing To Cylinder Head
• Fits 2010-2013 Ford Transit Connect, Housing To Cylinder Head
• Fits 2010-2020 Ford Fusion, Housing To Cylinder Head
• Fits 2019-2020 Ford SSV Plug-In Hybrid, Housing To Cylinder Head
• Fits 2011-2020 Lincoln MKZ, Housing To Cylinder Head
• Fits 2013-2018 Ford C-Max, Housing To Cylinder Head
• Fits 2003-2018 Ford Focus, Housing To Cylinder Head
• Fits 2006-2015 Mazda MX-5 Miata, Housing To Cylinder Head
• Fits 2004-2013 Mazda 3, Housing To Cylinder Head
• Fits 2009-2013 Mazda 3 Sport, Housing To Cylinder Head
• Fits 2005-2012 Ford Escape, Housing To Cylinder Head
• Fits 2007-2012 Mazda CX-7, Housing To Cylinder Head
• Fits 2001-2011 Ford Ranger, Housing To Cylinder Head
• Fits 2005-2011 Mercury Mariner, Housing To Cylinder Head
• Fits 2010-2011 Mercury Milan, Housing To Cylinder Head
• Fits 2006-2010 Mazda 5, Housing To Cylinder Head
• Fits 2001-2010 Mazda B2300, Housing To Cylinder Head
• Fits 2003-2008 Mazda 6, Housing To Cylinder Head
• Fits 2008 Mazda Tribute, Housing To Cylinder Head
• Fits 2005-2006 Mazda Tribute, Housing To Cylinder Head
• Fits 2006 Ford Fusion, Housing To Cylinder Head, To 12/04/2005
• Fits 2006 Mercury Milan, Housing To Cylinder Head, To 12/04/2005